Bioactive Secondary Metabolites of the Genus Diaporthe and Anamorph Phomopsis from Terrestrial and Marine Habitats and Endophytes: 2010–2019

Abstract

The genus Diaporthe and its anamorph Phomopsis are distributed worldwide in many ecosystems. They are regarded as potential sources for producing diverse bioactive metabolites. Most species are attributed to plant pathogens, non-pathogenic endophytes, or saprobes in terrestrial host plants. They colonize in the early parasitic tissue of plants, provide a variety of nutrients in the cycle of parasitism and saprophytism, and participate in the basic metabolic process of plants. In the past ten years, many studies have been focused on the discovery of new species and biological secondary metabolites from this genus. In this review, we summarize a total of 335 bioactive secondary metabolites isolated from 26 known species and various unidentified species of Diaporthe and Phomopsis during 2010–2019. Overall, there are 106 bioactive compounds derived from Diaporthe and 246 from Phomopsis, while 17 compounds are found in both of them. They are classified into polyketides, terpenoids, steroids, macrolides, ten-membered lactones, alkaloids, flavonoids, and fatty acids. Polyketides constitute the main chemical population, accounting for 64%. Meanwhile, their bioactivities mainly involve cytotoxic, antifungal, antibacterial, antiviral, antioxidant, anti-inflammatory, anti-algae, phytotoxic, and enzyme inhibitory activities. Diaporthe and Phomopsis exhibit their potent talents in the discovery of small molecules for drug candidates.

1. Introduction

Diaporthe is an important fungal genus of plant pathogens [1] belonging to the family Diaporthaceae, order Diaporthales, class Sordariomycetes [2]. It is mainly isolated from various hosts distributed in tropical and temperate zones and can cause diseases to a wide range of plant hosts, as well as humans and other mammals [3,4]. The ascomycetes of Diaporthe Nitschke 1870 and Phomopsis (Sacc.) Bubák 1905 are regarded to form a genus [5,6]. In Index Fungorum (2020), more than 1120 records of Diaporthe and 986 of Phomopsis are listed (http://www.indexfungorum.org/, accessed December 2020). There is a common understanding that, in these ascomycetes, the teleomorph states are named as Diaporthe and the anamorph states called as Phomopsis [7,8,9,10]. For a long time, a dispute has remained concerning whether the generic name should be defined as Diaporthe or Phomopsis. Due to the importance of this genus as plant pathogens, the classification of Diaporthe has been discussed by many researchers. Since Diaporthe was cited earlier and represents most of the species described in nature, more mycologists suggest that the use of Diaporthe as a generic name have more priority and is more suitable for the current study of this fungal group [11,12,13]. In recent years, the previous classification methods based on morphological characteristics are no longer applicable to the genus Diaporthe and advanced molecular techniques will replace them to solve the classification problem of Diaporthe [13,14]. In this review, we use the older name Diaporthe as the generic name.

Based on the existing literature investigations, more secondary metabolites have been separated from Phomopsis than Diaporthe. To date, a large number of compounds have been isolated from endophytic fungi of terrestrial plants in Diaporthe and Phomopsis, some of which originate from the marine environment (mainly mangroves and sediments). Most of compounds are classified as polyketides, which is the main structural type of secondary metabolites in this genus. The reported compounds showed various bioactivities, such as cytotoxic [15], antifungal [16], antibacterial [17], antiviral [18], antioxidant [19], anti-inflammatory [20], phytotoxic [21], and enzyme inhibition [22]. Up to now, there are 26 known species and various unidentified species of Diaporthe and Phomopsis have been studied for their metabolites. Our current review comprehensively summarize a total of 335 bioactive natural products from Diaporthe and Phomopsis between 2010 and 2019, covering their detailed chemical structures with classifications in structural types, as well as their bioactivities and habitats.

2. Bioactive Secondary Metabolites from Phomopsis

The Phomopsis fungi are important resource of bioactive compounds in the field of drug discovery, and have remarkable medical application value. According to the literature reports in recent ten years, a total of 246 bioactive compounds are summarized from Phomopsis herein. These substances have rich and diverse biological activities, such as cytotoxic, antifungal, antibacterial, antiviral, antioxidant, anti-inflammatory, phytotoxic, antimalarial, antialgae, antimigratory, pro-apoptotic, accelerating, and inhibiting the growth of subintestinal vessel plexus (SIV) branches, protecting effects on pancreatic β-cells, motility inhibitory and zoosporicidal potential, and enzyme inhibitory activities (

Table 1. The bioactive secondary metabolites of the anamorph Phomopsis during 2010–2019.

Number	Structural Types	Compounds	Strains	Habitats (T/M a)	Activities	Refs.
1	Xanthones	1,5-Dihydroxy-3-hydroxyethyl-6-methoxy-carbonylxanthone	Phomopsis sp.	Paris polyphylla var. yunnanensis (T)	Cytotoxic	[23]
2		1-Hydroxy-5-methoxy-3-hydroxyethyl-6-methoxycarbonylxanthone	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Cytotoxic	[23]
3		1-Hydroxy-3-hydroxyethyl-8-ethoxycarbonyl-xanthone	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Cytotoxic	[23]
4		Pinselin	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Cytotoxic	[23]
5		1-Hydroxy-8-(hydroxymethyl)-3-methoxy-6-methylxanthone	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Cytotoxic	[23]
6		2,6-Dihydroxy-3-methyl-9-oxoxanthene-8-carboxylic acid methyl ester	Phomopsis sp. (No. SK7RN3G1)	Sediment (M)	Cytotoxic	[24]
7		4,5-Dihydroxy-3-(2-hydroxyethyl)-1-methoxy-8-methoxy- carbonylxanthone	P. amygdali	Paris axialis (T)	Cytotoxic	[25]
8		1,8-Dihydroxy-4-(2-hydroxyethyl)-3-methoxyxanthone	P. amygdali	P. axialis (T)	Cytotoxic	[25]
9		Hydroxyvertixanthone	Phomopsis sp. YM 355364	Aconitum carmichaelii (T)	Antimicrobial	[26]
10		Dalienxanthone A	Phomopsis sp.	Paris daliensis (T)	Cytotoxic	[27]
11		Dalienxanthone B	Phomopsis sp.	P. daliensis (T)	Cytotoxic	[27]
12		Dalienxanthone C	Phomopsis sp.	P. daliensis (T)	Cytotoxic	[27]
13		Paucinervin E	P. amygdali	P. axialis (T)	Cytotoxic	[25]
14		1,3-Dihydroxy-4-(1,3,4-trihydroxybutan-2-yl)-8-methoxy-9H-xanthen-9-one	P. amygdali	P. polyphylla var. yunnanensis (T)	Cytotoxic	[28]
15		3-Methoxy-1,4,8-trihydroxy-5-(1ʹ,3ʹ,4ʹ-trihydroxybutan-2ʹ-yl)-xanthone	P. amygdali	P. axialis (T)	Cytotoxic	[29]
16		8-Methoxy-1,3,4-trihydroxy-5-(1ʹ,3ʹ,4ʹ-trihydroxybutan-2ʹ-yl)-xanthone	P. amygdali	P. axialis (T)	Cytotoxic	[29]
17		Secosterigmatocystin	Phomopsis sp. P. amygdali	P. polyphylla var. yunnanensis (T) P. axialis (T)	Cytotoxic Cytotoxic	[23] [29]
18		3,8-Dihydroxy-4-(2,3-dihydroxy-1-hydroxymethylpropyl)-1-methoxyxanthone	Phomopsis sp.	P. daliensis (T)	Cytotoxic	[27]
19		Oliganthins E	Phomopsis sp.	P. daliensis (T)	Cytotoxic	[27]
20		Dihydrosterigmatocystin	P. amygdali	P. axialis(T)	Cytotoxic	[29]
21		Vieillardixanthone	P. amygdali	P. axialis (T)	Cytotoxic	[29]
22		1,7-Dihydroxy-2-methoxy-3-(3-methylbut-2-enyl)xanthone	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Cytotoxic	[23]
23		1-Hydroxy-4,7-dimethoxy-6-(3-oxobutyl)-xanthone	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Cytotoxic	[23]
24		Asperxanthone	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Cytotoxic	[23]
25		6-O-Methyl-2-deprenylrheediaxanthone B	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Cytotoxic	[23]
26		Cratoxylumxanthone D	Phomopsis sp.	P. daliensis (T)	Cytotoxic	[27]
27		3-O-(6-O-α-L-Arabinopyranosyl)-β-D-glucopyranosyl-1,4-dimethoxyxanthone	Phomopsis sp. (ZH76)	Excoecaria agallocha (M)	Cytotoxic	[30]
28		Phomoxanthone A	P. longicolla Phomopsis sp. IM 41-1 Phomopsis sp. 33#	Sonneratia caseolaris (M) Rhizhopora mucronata (M) Rhizophora stylosa (M)	Pro-apoptotic Antimicrobial Inhibiting acetylcholinesterase and α-glucosidase, Antioxidant	[31] [32] [33]
29		12-O-Deacetyl-phomoxanthone A	Phomopsis sp. IM 41-1	R. mucronata (M)	Antimicrobial	[32]
30		Dicerandrol A	P. longicolla S1B4 Phomopsis sp. HNY29-2B	- b Acanthus ilicifolius (M)	Antimicrobial Cytotoxic	[34] [35]
31		Dicerandrol B	P. longicolla S1B4 Phomopsis sp. HNY29-2B	- b A. ilicifolius (M)	Antibacterial Cytotoxic	[34] [35]
32		Dicerandrol C	P. longicolla S1B4	- b	Antibacterial	[34]
33		Deacetylphomoxanthone B	P. longicolla S1B4 Phomopsis sp. HNY29-2B	- b A. ilicifolius(M)	Antibacterial Cytotoxic	[34] [35]
34		Penexanthone A	Phomopsis sp. HNY29-2B	A. ilicifolius (M)	Cytotoxic	[35]
35	Chromones	(+)-Phomopsichin A	Phomopsis sp. 33#	R. stylosa (M)	Antimicrobial, Antioxidant, Inhibiting acetylcholinesterase and α-glucosidase	[33]
36		(−)-Phomopsichin B	Phomopsis sp. 33#	R. stylosa (M)	Antimicrobial, Antioxidant, Inhibiting acetylcholinesterase and α-glucosidase	[33]
37		Phomopsichin C	Phomopsis sp. 33#	R. stylosa (M)	Antimicrobial, Antioxidant, Inhibiting acetylcholinesterase and α-glucosidase	[33]
38		Phomopsichin D	Phomopsis sp. 33#	R. stylosa (M)	Antimicrobial, Antioxidant, Inhibiting acetylcholinesterase and α-glucosidase	[33]
39		Chaetocyclinone B	Phomopsis sp. HNY29-2B	A. ilicifolius (M)	Cytotoxic	[36]
40		Pestalotiopsone F	Phomopsis sp. IFB-ZS1-S4	Scaevola hainanensis (M)	Inhibiting neuraminidase	[37]
41		Phomoxanthone F	Phomopsis sp. xy21	Xylocarpus granatum (M)	Anti-HIV	[38]
42		5-Hydroxy-3-hydroxymethyl-2-methyl-7-methoxychromone	Phomopsis sp. (No. Gx-4)	Sediment (M)	Cytotoxic, Inhibiting the growth of SIV branch	[39]
43		Phomochromone A	Phomopsis sp.	Cistus monspeliensis (T)	Antimicrobial, Antialgal	[40]
44		Phomochromone B	Phomopsis sp.	C. monspeliensis (T)	Antimicrobial, Antialgal	[40]
45		Phomochromanone A	Phomopsis sp. CGMCC No. 5416	Achyranthes bidentata (T)	Cytotoxic, Anti-HIV	[41]
46		Phomochromanone B	Phomopsis sp. CGMCC No. 5416	A. bidentata (T)	Cytotoxic, Anti-HIV	[41]
47		5-Hydroxy-6,8-dimethoxy-2-benzyl-4H-naphtho[2,3-b]-pyran-4-one	Phomopsis sp. ZSU-H26	E. agallocha (M)	Cytotoxic	[42]
48		Phomopsis-H76 A	Phomopsis sp. (#zsu-H76)	E. agallocha (M)	Accelerating the growth of SIV branch	[43]
49	Chromanones	(3R,4S)-3,4-Dihydro-4,5,8-trihydroxy-3-methylisocoumarin	Phomopsis sp. (No. ZH-111)	Sediment (M)	Accelerating the growth of SIV branch, Cytotoxic	[44]
50		(3R,4S)-3,4-Dihydro-8-hydroxy-4-methoxy-3-methylisocoumarin	Phomopsis sp. (No. Gx-4)	Sediment (M)	Cytotoxic, Accelerating the growth of SIV branch	[39]
51		3,4-Dihydro-8-hydroxy-3-methyl-1H-2-benzopyran-1-one-5-carboxylic acid	Phomopsis sp. (No. Gx-4)	Sediment (M)	Cytotoxic, Accelerating the growth of SIV branch	[39]
52		5,8-Dihydroxy-4-methylcoumarin	Phomopsis sp. (No. Gx-4)	Sediment (M)	Cytotoxic, Inhibiting the growth of SIV branch	[39]
53		(10S)-Diaporthin	Phomopsis sp. sh917	Isodon eriocalyx var. laxiflora (T)	Antiangiogenic	[45]
54		Cytosporone D	Phomopsis sp. CMU-LMA	Alpinia malacensis (T)	Antimicrobial, Inibiting DnaG primase	[46]
55		Alternariol	Phomopsis sp. A240 Phomopsis sp. CAFT69 Phomopsis sp.	Taxus chinensis var. mairei (T) Endodesmia calophylloides (T) Senna spectabilis (T)	Cytotoxic Motility inhibitory and zoosporicidal potential Anti-inflammatory	[47] [48] [49]
56		Alternariol-5-O-methyl ether	Phomopsis sp. CAFT69	E. calophylloides (T)	Motility inhibitory and zoosporicidal potential	[48]
57		5ʹ-Hydroxyalternariol	Phomopsis sp. A240 Phomopsis sp. CAFT69	T. chinensis var. mairei (T) E. calophylloides (T)	Antioxidant Motility inhibitory and zoosporicidal potential	[47] [48]
58		Phomochromanone C	Phomopsis sp. CGMCC No. 5416	A. bidentata (T)	Cytotoxic, Pro-apoptotic	[41]
59	Benzofuranones	7-Methoxy-6-methyl-3-oxo-1,3-dihydroisobenzofuran-4-carboxylic acid	Phomopsis sp. A123	Kandelia candel (M)	Cytotoxic, Antifungal, Antioxidant	[50]
60		Diaporthelactone	Phomopsis sp. A123	K. candel (M)	Cytotoxic, Antifungal, Antioxidant	[50]
61		7-Hydroxy-4,6-dimethy-3H-isobenzofuran-1-one	Phomopsis sp. A123	K. candel (M)	Cytotoxic, Antifungal, Antioxidant	[50]
62		7-Methoxy-4,6-dimethyl-3H-isobenzofuran-1-one	Phomopsis sp. A123	K. candel (M)	Cytotoxic, Antifungal, Antioxidant	[50]
63		4-(Hydroxymethyl)-7-methoxy-6-methyl-1(3H)-isobenzofuranone	Phomopsis sp. (No. ZH-111)	Sediment (M)	Inhibiting the growth of SIV branch, Cytotoxic	[44]
64		Cytosporone E	Phomopsis sp. BCC 45011	X. granatum(M)	Cytotoxic, Antimalarial	[51]
65		Cytosporone P	Phomopsis sp. BCC 45011	X. granatum (M)	Antimalarial	[51]
66		Phomopsidone A	Phomopsis sp. A123	K. candel (M)	Cytotoxic, Antifungal, Antioxidant	[50]
67		Excelsione	Phomopsis sp. A123	K. candel (M)	Cytotoxic, Antifungal, Antioxidant	[50]
68		Excelsional	Phomopsis sp. CAFT69	E. calophylloides (T)	Motility inhibitory and zoosporicidal potential	[48]
69		Lithocarol A	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[52]
70		Lithocarol B	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[52]
71		Lithocarol C	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[52]
72		Lithocarol D	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[52]
73		Lithocarol E	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[52]
74		Lithocarol F	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[52]
75		Isoprenylisobenzofuran A	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[52]
76		7-Methoxy-2-(4-methoxyphenyl)-3-methyl-5-(3-prenyl)-benzofuran	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Anti-TMV	[53]
77		2-(4-Methoxyphenyl)-3-methyl-5-(3-prenyl)-benzofuran-7-ol	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Anti-TMV	[53]
78		2-(4-Hydroxy-3,5-dimethoxyphenyl)-3-methyl-5-(3-prenyl) benzofuran-7-ol	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Anti-TMV	[53]
79		Moracin N	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Anti-TMV	[53]
80		2-(2′-Methoxy-4′-hydroxy)-aryl-3-methy-6-hydroxybenzofuran	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Anti-TMV	[53]
81		Iteafuranal B	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Anti-TMV	[53]
82		Moracin P	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Anti-TMV	[53]
83	Pyrones	Phomaspyrone A	P. asparagi SWUKJ5.2020	Kadsura angustifolia (T)	Cytotoxic	[54]
84		Macommelin-8,9-diol	P. asparagi SWUKJ5.2020	K. angustifolia (T)	Cytotoxic	[54]
85		Phomaspyrone B	P. asparagi SWUKJ5.2020	K. angustifolia (T)	Cytotoxic	[54]
86		Phomaspyrone C	P. asparagi SWUKJ5.2020	K. angustifolia (T)	Cytotoxic	[54]
87		Phomaspyrone D	P. asparagi SWUKJ5.2020	K. angustifolia (T)	Cytotoxic	[54]
88		Phomaspyrone E	P. asparagi SWUKJ5.2020	K. angustifolia (T)	Cytotoxic	[54]
89		Macommelin-9-ol	P. asparagi SWUKJ5.2020	K. angustifolia (T)	Cytotoxic	[54]
90		Macommelin	P. asparagi SWUKJ5.2020	K. angustifolia (T)	Cytotoxic	[54]
91		Pyrenocine J	Phomopsis sp.	Cistus salvifolius (T)	Antifungal, Antibacterial, Algicidal	[55]
92		Pyrenocine K	Phomopsis sp.	C. salvifolius (T)	Antifungal, Antibacterial, Algicidal	[55]
93		Pyrenocine L	Phomopsis sp.	C. salvifolius (T)	Antibacterial, Algicidal	[55]
94		Pyrenocine M	Phomopsis sp.	C. salvifolius (T)	Antifungal, Antibacterial, Algicidal	[55]
95		Phomopsis-H76 C	Phomopsis sp. (#zsu-H76)	E. agallocha (M)	Inhibiting the growth of SIV branch	[43]
96	Quinones	Anhydrojavanicin	Phomopsis sp. HCCB04730	Radix Stephaniae Japonicae (T)	Cytotoxic, Anti-HIV	[56]
97		Dihydroanhydrojavanicin	Phomopsis sp. HCCB04730	Radix Stephaniae Japonicae (T)	Cytotoxic, Anti-HIV	[56]
98		Fusarubin	Phomopsis sp. HCCB04730	Radix Stephaniae Japonicae (T)	Cytotoxic, Anti-HIV	[56]
99		Javanicin	Phomopsis sp. HCCB04730	Radix Stephaniae Japonicae (T)	Cytotoxic, Anti-HIV	[56]
100		2-Acetonyl-3methyl-5-hydroxy-7-methoxy-naphthazarin	Phomopsis sp. HCCB04730	Radix Stephaniae Japonicae (T)	Cytotoxic, Anti-HIV	[56]
101		Bostrycoidin	Phomopsis sp. HCCB04730	Radix Stephaniae Japonicae (T)	Cytotoxic, Anti-HIV	[56]
102		Altersolanol B	P. longicolla HL-2232	Bruguiera sexangula var. rhynchopetala (M)	Antibacterial	[57]
103		Altersolanol A	Phomopsis sp. (PM0409092) P. foeniculi	Nyctanthes arbor-tristis (T) Foeniculum vulgare (T)	Cytotoxic Phytotoxic	[58] [59]
104		(2R,3S)-7-Ethyl-1,2,3,4-tetrahydro-2,3,8-trihdroxy-6-methoxy-3-methyl-9,10-anthracenedione	Phomopsis sp. PSU-MA214	Rhizophora apiculata (M)	Cytotoxic, Antibacterial	[60]
105		Altersolanol J	P. foeniculi	F. vulgare (T)	Phytotoxic	[59]
106		2-Hydroxymethyl-4β,5α,6β-trihydroxycyclohex-2-en	Phomopsis sp.	Notobasis syriaca (T)	Antibacterial, Algicidal	[61]
107		(−)-Phyllostine	Phomopsis sp.	N. syriaca (T)	Antifungal, Antibacterial, Algicidal	[61]
108		(+)-Epiepoxydon	Phomopsis sp.	N. syriaca (T)	Antibacterial, Algicidal	[61]
109		(+)-Epoxydon monoacetate	Phomopsis sp.	N. syriaca (T)	Antifungal, Antibacterial, Algicidal	[61]
110		Phomonaphthalenone A	Phomopsis sp. HCCB04730	Radix Stephaniae Japonicae (T)	Cytotoxic, Anti-HIV	[56]
111		Ampelanol	Phomopsis sp. HNY29-2B	A. ilicifolius (M)	Antibacterial	[62]
112	Phenols	Phomosine K	Phomopsis sp.	N. syriaca (T)	Antibacterial	[61]
113		Phomosine A	Phomopsis sp.	Ligustrum vulgare (T)	Antifungal, Antibacterial, Inhibiting algae	[63]
114		Phomosine B	Phomopsis sp.	L. vulgare (T)	Antifungal, Antibacterial	[63]
115		Phomosine C	Phomopsis sp.	L. vulgare (T)	Antifungal, Antibacterial	[63]
116		Phomosine D	Phomopsis sp.	L. vulgare (T)	Antifungal, Inhibiting algae	[63]
117		Phomosine I	Phomopsis sp.	L. vulgare (T)	Antifungal, Antibacterial	[63]
118		4-(3-Methoxy-5-methylphenoxy)-2-(2-hydroxyethyl)-6-(hydroxymethyl)phenol	P. asparagi	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[64]
119		4-(3-Hydroxy-5-methylphenoxy)-2-(2-hydroxyethyl)-6-(hydroxymethyl)phenol	P. asparagi	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[64]
120		4-(3-Methoxy-5-methylphenoxy)-2-(2-hydroxyethyl)-6-methylphenol	P. fukushii	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[65]
121		4-(3-Hydroxy-5-methylphenoxy)-2-(2-hydroxyethyl)-6-methylphenol	P. fukushii	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[65]
122		4-(3-Methoxy-5-methylphenoxy)-2-(3-hydroxypropyl)-6-methylphenol	P. fukushii	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[65]
123		1-(4-(3-Methoxy-5-methylphenoxy)-2-methoxy-6-methylphenyl)-3-methylbut-3-en-2-one	P. fukushii	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[66]
124		1-(4-(3-(Hydroxymethyl)-5methoxyphenoxy)-2-methoxy-6-methylphenyl)-3-methylbut-3-en-2-one	P. fukushii	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[66]
125		1-(4-(3-Hydroxy-5(hydroxymethyl)phenoxy)-2-methoxy-6-methylphenyl)-3-methylbut-3-en-2-one	P. fukushii	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[66]
126		1-[2-Methoxy-4-(3-methoxy-5-methylphenoxy)-6-methylphenyl]-ethanone	P. fukushii	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[67]
127		1-[4-(3-(Hydroxymethyl)-5-methoxyphenoxy)-2-methoxy-6-methylphenyl]-ethanone	P. fukushii	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[67]
128		3-Hydroxy-1-(1,8-dihydroxy-3,6-dimethoxynaphthalen-2-yl)propan-1-one	P. fukushii	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[68]
129		3-Hydroxy-1-(1,3,8-trihydroxy-6-methoxynaphthalen-2-yl)propan-1-one	P. fukushii	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[68]
130		3-Hydroxy-1-(1,8-dihydroxy-3,5-dimethoxynaphthalen-2-yl)propan-1-one	P. fukushii	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[68]
131		5-Methoxy-2-methyl-7-(3-methyl-2-oxobut-3-enyl)-1-naphthaldehyde	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[69]
132		2-(Hydroxymethyl)-5-methoxy-7-(3-methyl-2-oxobut-3-enyl)-1-naphthaldehyde	Phomopsis sp.	P. polyphylla var. yunnanensis (T)	Anti-MRSA	[69]
133		Tenellone H	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[70]
134		16-Acetoxycytosporone B	Phomopsis sp. YM 355364	A. carmichaeli (T)	Antifungal	[71]
135		Cytosporone B	Phomopsis sp. 0391 Phomopsis sp. PSU-H188	P. polyphylla var. yunnanensis (T) Hevea brasiliensis (T)	Inhibiting lipase Protecting pancreatic β-cells	[72] [73]
136		Dothiorelone A	Phomopsis sp. 0391	P. polyphylla var. yunnanensis (T)	Inhibiting lipase	[72]
137		Lithocarpinol A	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[74]
138		Lithocarpinol B	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[74]
139		Phomoindene A	Phomopsis sp. (No. GX7-4A)	Sediment (M)	Cytotoxic	[75]
140		4-Hydroxybenzaldehyde	Phomopsis sp. YM 355364	A. carmichaelii (T)	Antimicrobial	[26]
141		5,5′-Dimethoxybiphenyl-2,2′-diol	P. longicolla HL-2232	B. sexangula var. rhynchopetala (M)	Antibacterial	[57]
142		Phomonitroester	Phomopsis sp. PSU-MA214	R. apiculate (M)	Cytotoxic	[60]
143		Cytosporone U	Phomopsis sp. FJBR-11	Brucea javanica (T)	Anti-TMV	[76]
144		Altenusin	Phomopsis sp. CAFT69	E. calophylloides (T)	Motility inhibitory and zoosporicidal potential	[48]
145		Cosmochlorin D	Phomopsis sp. N-125	Ficus ampelas (T)	Cytotoxic, Growth-inhibition activity	[77]
146		Cosmochlorin E	Phomopsis sp. N-125	F. ampelas (T)	Cytotoxic, Growth-inhibition activity	[77]
147	Oblongolides	Oblongolide Z	Phomopsis sp. BCC 9789	Musa acuminate (T)	Cytotoxic, Anti-HSV-1	[78]
148		Oblongolide Y	Phomopsis sp. BCC 9789	M. acuminate (T)	Cytotoxic	[78]
149		Oblongolide C1	Phomopsis sp. XZ-01	Camptotheca acuminate (T)	Cytotoxic	[79]
150		Oblongolide P1	Phomopsis sp. XZ-01	C. acuminate (T)	Cytotoxic	[79]
151		Oblongolide X1	Phomopsis sp. XZ-01	C. acuminate (T)	Cytotoxic	[79]
152		6-Hydroxyphomodiol	Phomopsis sp. XZ-01	C. acuminate (T)	Cytotoxic	[79]
153		Oblongolide C	Phomopsis sp. XZ-01	C. acuminate (T)	Cytotoxic	[79]
154		2-Deoxy-4α-hydroxyoblongolide X	Phomopsis sp. BCC 9789	M. acuminate (T)	Anti-HSV-1	[78]
155	Unclassified polyketides	Phomoxydiene C	Phomopsis sp. BCC 45011	X. granatum (M)	Cytotoxic, Antimalarial	[51]
156		1893 A	Phomopsis sp. BCC 45011	X. granatum (M)	Cytotoxic	[51]
157		Mycoepoxydiene	Phomopsis sp. BCC 45011	X. granatum (M)	Cytotoxic, Antimalarial	[51]
158		Deacetylmycoepoxydiene	Phomopsis sp. BCC 45011	X. granatum (M)	Cytotoxic, Antimalarial	[51]
159		Phomoxydiene A	Phomopsis sp. BCC 45011	X. granatum (M)	Cytotoxic, Antimalarial	[51]
160		Phomopoxide A	Phomopsis sp. YE3250	Paeonia delavayi (T)	Cytotoxic, Antifungal, Inhibiting α-glycosidase	[80]
161		Phomopoxide B	Phomopsis sp. YE3250	P. delavayi (T)	Cytotoxic, Antifungal, Inhibiting α-glycosidase	[80]
162		Phomopoxide C	Phomopsis sp. YE3250	P. delavayi (T)	Cytotoxic, Antifungal, Inhibiting α-glycosidase	[80]
163		Phomopoxide D	Phomopsis sp. YE3250	P. delavayi (T)	Cytotoxic, Antifungal, Inhibiting α-glycosidase	[80]
164		Phomopoxide E	Phomopsis sp. YE3250	P. delavayi (T)	Cytotoxic, Antifungal, Inhibiting α-glycosidase	[80]
165		Phomopoxide F	Phomopsis sp. YE3250	P. delavayi (T)	Cytotoxic, Antifungal, Inhibiting α-glycosidase	[80]
166		Phomopoxide G	Phomopsis sp. YE3250	P. delavayi (T)	Cytotoxic, Antifungal, Inhibiting α-glycosidase	[80]
167		Phomentrioloxin	Phomopsis sp.	Carthamus lanatus (T)	Phytotoxic	[81]
168		Phomotenone	Phomopsis sp.	C. monspeliensis (T)	Antifungal, Antibacterial, Antialgal	[40]
169		Phomopsolide B	Phomopsis sp. DC275	Vitis vinifera (T)	Antibacterial, Phytotoxic	[82]
170		Phomopsolidone A	Phomopsis sp. DC275	V. vinifera (T)	Antibacterial, Phytotoxic	[82]
171		Phomopsolidone B	Phomopsis sp. DC275	V. vinifera (T)	Antibacterial, Phytotoxic	[82]
172	Monoterpenoids	Acropyrone	Phomopsis sp. HNY29-2B	A. ilicifolius (M)	Antibacterial	[62]
173		Nectriapyrone	P. foeniculi	F. vulgare (T)	Phytotoxic	[59]
174		(1S,2S,4S)-Trihydroxy-p-menthane	Phomopsis sp.	C. monspeliensis (T)	Antibacterial, Antialgal	[40]
175	Sesquiterpenoids	Phomophyllin A	Phomopsis sp. TJ507A	Phyllanthus glaucus (T)	Inhibiting BACE1	[83]
176		Phomophyllin B	Phomopsis sp. TJ507A	P. glaucus (T)	Inhibiting BACE1	[83]
177		Phomophyllin C	Phomopsis sp. TJ507A	P. glaucus (T)	Inhibiting BACE1	[83]
178		Phomophyllin D	Phomopsis sp. TJ507A	P. glaucus (T)	Inhibiting BACE1	[83]
179		Phomophyllin E	Phomopsis sp. TJ507A	P. glaucus (T)	Inhibiting BACE1	[83]
180		Phomophyllin F	Phomopsis sp. TJ507A	P. glaucus (T)	Inhibiting BACE1	[83]
181		Phomophyllin G	Phomopsis sp. TJ507A	P. glaucus (T)	Inhibiting BACE1	[83]
182		Radulone B	Phomopsis sp. TJ507A	P. glaucus (T)	Inhibiting BACE1	[83]
183		Phomophyllin I	Phomopsis sp. TJ507A	P. glaucus (T)	Inhibiting BACE1	[83]
184		Onitin	Phomopsis sp. TJ507A	P. glaucus (T)	Inhibiting BACE1	[83]
185		(7R,9S,10R)-3,9-Di-hidroxicalamenene	P. cassiae	Cassia spectabilis (T)	Inhibiting acetylcholinesterase, Antifungal	[84]
186		(7R,9R,10R)-3,9-Di-hidroxicalamenene	P. cassiae	C. spectabilis (T)	Inhibiting acetylcholinesterase, Antifungal	[84]
187		(7S,10R)-3-Hidroxicalamen-8-one	P. cassiae	C. spectabilis (T)	Inhibiting acetylcholinesterase, Antifungal	[84]
188		Aristelegone-A	P. cassiae	C. spectabilis (T)	Inhibiting acetylcholinesterase, Antifungal	[84]
189		Phomoarcherin A	P. archeri	Vanilla albidia (T)	Cytotoxic	[85]
190		Phomoarcherin B	P. archeri	V. albidia (T)	Cytotoxic, Antimalarial	[85]
191		Phomoarcherin C	P. archeri	V. albidia (T)	Cytotoxic	[85]
192		Kampanol A	P. archeri	V. albidia (T)	Cytotoxic	[85]
193		(+)-S-1-Methyl-abscisic-6-acid	P. amygdali	Call midge (T)	Antibacterial	[86]
194		(+)-S-Abscisic acid	P. amygdali	C. midge (T)	Antibacterial	[86]
195		7-Hydroxy-10-oxodehydrodihydrobotrydial	Phomopsis sp. TJ507A	P. glaucus (T)	Inhibiting BACE1	[83]
196		Curcumol	P. castaneae-mollissimae GQH87	Artemisia annua (T)	Cytotoxic	[87]
197		9-Hydroxyphomopsidin	Phomopsis sp. CAFT69	E. calophylloides (T)	Motility inhibitory and zoosporicidal potential	[48]
198		Phomopsidin	Phomopsis sp. CAFT69	E. calophylloides (T)	Motility inhibitory and zoosporicidal potential	[48]
199		AA03390	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[70]
200	Diterpenoids	Libertellenone J	Phomopsis sp. S12	Illigera rhodantha (T)	Anti-inflammatory	[88]
201		Libertellenone C	Phomopsis sp. S12	- b	Anti-inflammatory	[89]
202		Libertellenone T	Phomopsis sp. S12	- b	Anti-inflammatory	[89]
203		Pedinophyllol K	Phomopsis sp. S12	- b	Anti-inflammatory	[89]
204		Pedinophyllol L	Phomopsis sp. S12	- b	Anti-inflammatory	[89]
205		Fusicoccin J	P. amygdali	C. midge (T)	Antibacterial	[86]
206		3α-Hydroxyfusicoccin J	P. amygdali	C. midge (T)	Antibacterial	[86]
207	Triterpenoids	3S,22R,26-Trihydroxy-8,24E-euphadien-11-one	P. chimonanthi	Tamarix chinensis (T)	Cytotoxic	[90]
208		Betulinic acid	Phomopsis sp. SNB-LAP1-7-32	Diospyros carbonaria (T)	Antiviral, Cytotoxic	[91]
209		Oleanolic acid	P. castaneae-mollissi mae GQH87	A. annua (T)	Cytotoxic	[87]
210	Steroids	(14β,22E)-9,14-Dihydroxyergosta-4,7,22-triene-3,6-dione	Phomopsis sp.	A. carmichaeli (T)	Antifungal	[92]
211		(5α,6β,15β,22E)-6-Ethoxy-5,15-dihydroxyergosta-7,22-dien-3-one	Phomopsis sp.	A. carmichaeli (T)	Antifungal	[92]
212		Calvasterol A	Phomopsis sp.	A. carmichaeli (T)	Antifungal	[92]
213		Calvasterol B	Phomopsis sp.	A. carmichaeli (T)	Antifungal	[92]
214		Ganodermaside D	Phomopsis sp.	A. carmichaeli (T)	Antifungal	[92]
215		Dankasterone A	Phomopsis sp. YM 355364	A. carmichaeli (T)	Antifungal, Anti-influenza	[71]
216		3β,5α,9α-Trihydroxy-(22E,24R)-ergosta-7,22-dien-6-one	Phomopsis sp. YM 355364	A. carmichaeli (T)	Antifungal	[71]
217		Phomopsterone B	Phomopsis sp. TJ507A	P. glaucus (T)	Anti-inflammatory	[93]
218		Cyathisterol	Phomopsis sp. YM 355364	A. carmichaelii (T)	Antifungal	[26]
219	Macrolides	Sch-642305	Phomopsis sp. CMU-LMA	Alpinia malaccensis (T)	Cytotoxic, Antimicrobial	[94]
220		LMA-P1	Phomopsis sp. CMU-LMA	A. malaccensis (T)	Cytotoxic	[94]
221		Benquoine	Phomopsis sp. CMU-LMA	A. malaccensis (T)	Cytotoxic, Antimicrobial	[94]
222		Aspergillide C	Phomopsis sp. IFB-ZS1-S4	S. hainanensis (M)	Inhibiting neuraminidase	[37]
223		Lithocarpin A	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[95]
224		Lithocarpin B	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[95]
225		Lithocarpin C	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[95]
226		Lithocarpin D	P. lithocarpus FS508	Sediment (M)	Cytotoxic	[95]
227	Alkaloids	Phomopchalasin B	Phomopsis sp. shj2	I. eriocalyx var. laxiflora (T)	Antimigratory	[96]
228		Phomopsichalasin G	P. spp. xy21 and xy22	X. granatum (M)	Cytotoxic	[97]
229		18-Metoxycytochalasin J	Phomopsis sp.	Garcinia kola (T)	Cytotoxic, Antibacterial	[98]
230		Cytochalasin H	Phomopsis sp. Phomopsis sp. By254 Phomopsis sp.	G. kola (T) Gossypium hirsutum (T) S. spectabilis (T)	Cytotoxic, Antibacterial Antifungal Inhibiting acetylcholinesterase, Anti-inflammatory	[98] [99] [49]
231		Cytochalasin J	Phomopsis sp. Phomopsis sp. P. asparagi	G. kola (T) S. spectabilis (T) Peperomia sui (T)	Cytotoxic, Antibacterial Anti-inflammatory Antiandrogen	[98] [49] [100]
232		Phomopchalasin C	Phomopsis sp. shj2	I. eriocalyx var. laxiflora (T)	Cytotoxic, Anti-inflammatory, Antimigratory	[96]
233		Cytochalasin N	Phomopsis sp. By254	G. hirsutum (T)	Antifungal	[99]
234		Epoxycytochalasin H	Phomopsis sp. By254	G. hirsutum (T)	Antifungal	[99]
235		Diaporthalasin	Phomopsis sp. PSU-H188	H. brasiliensis (T)	Anti-MRSA	[73]
236		(+)-Tersone E	P. tersa FS441	Sediment (M)	Antibacterial, Cytotoxic	[101]
237		ent-Citridone A	P. tersa FS441	Sediment (M)	Antibacterial	[101]
238		Phochrodine C	Phomopsis sp. 33#	R. stylosa (M)	Anti-inflammatory	[102]
239		Phochrodine D	Phomopsis sp. 33#	R. stylosa (M)	Anti-inflammatory, Antioxidant	[102]
240		PM181110	P. glabrae	Pongamia pinnata (T)	Anticancer	[103]
241		Fusaristatin A	P. longicolla S1B4	- b	Antibacterial	[34]
242		Exumolide A	Phomopsis sp. (No. ZH-111)	Sediment (M)	Accelerating the growth of SIV branch, Cytotoxic	[44]
243	Flavonoids	Quercetin	P. castaneae-mollissimae GQH87	A. annua (T)	Cytotoxic	[87]
244		Luteolin	P. castaneae-mollissimae GQH87	A. annua (T)	Cytotoxic	[87]
245		Naringenin	P. castaneae-mollissimae GQH87	A. annua (T)	Cytotoxic	[87]
246		Luteolin-7-O-glucoside	P. castaneae-mollissimae GQH87	A. annua (T)	Cytotoxic	[87]

^a T: terrestrial environment; M: marine environment; ^b The habitat was not mentioned.

). Among them, some interesting and promising bioactive compounds might be used in pharmaceutical and agricultural fields. The derived habitats of the Phomopsis strains can also be found in Table 1, which shows that there are 174 (accounting for 71%) and 66 (accounting for 27%) compounds obtained from terrestrial and marine environments, respectively, while six compounds (accounting for 2%) were not mentioned their habitats.

2.1. Polyketides

Polyketides are a large and diverse family of natural products, containing various chemical structures and biological activities [104]. In this review, 171 polyketides are summarized from Phomopsis, accounting for 70% of the total compounds from Phomopsis. The main bioactivities involve cytotoxic, antibacterial and antifungal activities. Herein, we classify these polyketides into xanthones, chromones, chromanones, benzofuranones, pyrones, quinones, phenols, oblongolides, and unclassified polyketides.

2.1.1. Xanthones

Xanthones are a kind of compounds with the framework of 9H-xanthen-9-one, which mainly have anti-inflammatory, antimicrobial, antioxidant and cytotoxic activities [105]. A series of xanthones were obtained from the fermentation products of Phomopsis sp. isolated from Paris polyphylla var. yunnanensis, including three new compounds, 1,5-dihydroxy-3-hydroxyethyl-6-methoxycarbonylxanthone (1), 1-hydroxy-5-methoxy-3-hydroxyethyl-6-methoxycarbonylxanthone (2), 1-hydroxy-3-hydroxyethyl-8-ethoxy-carbonyl-xanthone (3), and seven known ones, pinselin (4), 1-hydroxy-8-(hydroxymethyl)-3-methoxy-6-methylxanthone (5), secosterigmatocystin (17), 1,7-dihydroxy-2-methoxy-3-(3-methylbut-2-enyl)xanthone (22), 1-hydroxy-4,7-dimethoxy-6-(3-oxobutyl)xanthone (23), asperxanthone (24) and 6-O-methyl-2-deprenylrheediaxanthone B (25). The cytotoxicities of all compounds to five human tumor cells (NB4, A549, SHSY5Y, PC3, and MCF7) were evaluated by using paclitaxel as positive control. The results showed that compounds 1 and 3 displayed cytotoxic activities and provided the IC₅₀ values of 3.6 and 2.5 μM against A549 cells, and 1 gave an IC₅₀ value of 2.7 μM against MCF7 cells. Compounds 22–23 showed weak activities and offered IC₅₀ values greater than 10 μM for five tested cells. The others gave IC₅₀ values between 3.8–10 μM against tested cells [23]. A new compound, 2,6-dihydroxy-3-methyl-9-oxoxanthene-8-carboxylic acid methyl ester (6), was isolated from Phomopsis sp. (No. SK7RN3G1) of mangrove sediment in the Shankou, Hainan, China. It showed cytotoxicity towards HEp-2 (IC₅₀ = 8 μg/mL) and HepG2 (IC₅₀ = 9 μg/mL) cancer cells [24]. Three secondary metabolites were characterized from fermentation products of P. amygdali, isolated from Paris axialis: 4,5-dihydroxy-3-(2-hydroxyethyl)-1-methoxy-8-methoxycarbonylxanthone (7), 1,8-dihydroxy-4-(2-hydroxyethyl)-3-methoxyxanthone (8), and paucinervin E (13). Compound 7 was active against A549 (IC₅₀ = 2.6 μM) and PC3 (IC₅₀ = 2.4 μM) cell lines. Compounds 8 and 13 displayed moderate activities with IC₅₀ values in the range of 5.2–9.2 μM against one or more cell lines of NB4, A549, SHSY5Y, PC3 and MCF7 [25]. Hydroxyvertixanthone (9) was obtained from the endophytic fungus Phomopsis sp. YM 355364, originated from Chinese medicinal plant Aconitum carmichaelii. It showed antimicrobial activity with minimal inhibitory concentration (MIC) values of 256, 256, 128, and 64 μg/mL against Escherichia coli, Bacillus subtilis, Pyricularia oryzae, and Candida albicans, respectively [26]. The fermentation of fungus Phomopsis sp. derived from Paris daliensis, led to the isolation of six xanthones and identified as dalienxanthones A-C (10–12), 3,8-dihydroxy-4-(2,3-dihydroxy-1-hydroxymethylpropyl)-1-methoxyxanthone (18), oliganthins E (19), and cratoxylumxanthone D (26). These compounds were evaluated for cytotoxicities of five cancer cell lines (NB4, A549, SHSY5Y, PC3 and MCF-7). Compounds 12 and 18 were active to SHSY5Y with IC₅₀ values of 3.8 and 3.5 μM, respectively, and the remaining compounds provided IC₅₀ values in the range of 4.6–9.2 μM [27]. An investigation of extracts from fungus P. amygdali derived from the rhizome of Paris polyphylla var. yunnanensis afforded a new xanthone, 1,3-dihydroxy-4-(1,3,4-trihydroxybutan-2-yl)-8-methoxy-9H-xanthen-9-one (14). The bioactive results showed that 14 exhibited significant cytotoxic activity against A549 (IC₅₀ = 5.8 μM) and PC3 (IC₅₀ = 3.6 μM) [28].

An endophytic fungus P. amygdali associated with the rhizome of Paris axialis was cultured to obtain five xanthones: 3-methoxy-1,4,8-trihydroxy-5-(1ʹ,3ʹ,4ʹ-trihydroxybutan-2ʹ-yl)-xanthone (15), 8-methoxy-1,3,4-trihydroxy-5-(1ʹ,3ʹ,4ʹ-trihydroxybutan-2ʹ-yl)-xanthone (16), secosterigmatocystin (17), dihydrosterigmatocystin (20), and vieillardixanthone (21). The cytotoxic assay for NB4, A549, SHSY5Y, PC3 and MCF7 cancer cells were evaluated. The IC₅₀ values of compound 15 against A549 and 16 against SHSY5Y were 3.6 and 4.2 μM, respectively. Compounds 17 and 20–21 displayed moderate activities with IC₅₀ values in the range of 5.4–8.8 μM [29]. Studies of an endophytic fungus Phomopsis sp. (ZH76) from the stems of the mangrove tree Excoecaria agallocha contained a new O-glycoside compound, 3-O-(6-O-α-L-arabinopyranosyl)-β-D-glucopyranosyl-1,4-dimethoxyxanthone (27). The IC₅₀ values of cytotoxicity for compound 27 on HEp-2 and HepG2 cells were 9 and 16 μmol/mL, respectively [30]. Phomoxanthone A (28), a dimeric tetrahydroxanthone, was extracted from P. longicolla of the mangrove tree Sonneratia caseolaris. Compound 28 had the strongest pro-apoptotic activity on human cancer cell lines and cisplatin-resistant cells, and its activity on healthy blood cells was reduced by more than 100 times. It was the most effective activator of mouse T lymphocytes, NK cells, and macrophages [31]. The study on secondary metabolites from fungus Phomopsis sp. IM 41-1 of mangrove plant Rhizhopora mucronata afforded phomoxanthone A (28) and 12-O-deacetyl-phomoxanthone A (29). When the concentration was 30 μg/ disk, compounds 28 and 29 showed moderate antimicrobial activities against Botrytis cinerea, Sclerotinia sclerotiorum, Diaporthe medusaea, and Staphylococcus aureus, but were inactive against Pseudomonas aeruginosa [32]. Four bioactive metabolites, dicerandrols A-C (30–32) and deacetylphomoxanthone B (33), were derived from P. longicolla S1B4. All compounds exhibited strong antibacterial activities against Xanthomonas oryzae KACC 10331. Dicerandrol A (30) also displayed notable antimicrobial activity against S. aureus, B. subtilis, and C. albicans with MIC values of 0.25, 0.125 and 2 μg/mL [34]. Phomopsis sp. HNY29-2B, isolated from mangrove plant Acanthus ilicifolius, produced four xanthone derivatives, 30–31, 33 and penexanthone A (34). Compounds 30–31 and 33–34 displayed cyctotoxicities and provided IC₅₀ values of 1.76–42.82 μM against MDA-MB-435, HCT-116, Calu-3, Huh7, and MCF-10A human cancer cell lines [35]. The structures of xanthones (1–34) are shown in Figure 1.

2.1.2. Chromones

Chromones are a class of bioactive compounds with a benzo-γ-pyrone skeleton, which have been reported to have various activities, such as anti-tumor, anti-viral, antimicrobial, anti-inflammatory, and antioxidant [106]. Phomopsis sp. 33#, a mangrove endophytic fungus isolated from the bark of Rhizophora stylosa, produced four new chromone derivatives, (+)-phomopsichin A (35), (−)-phomopsichin B (36), phomopsichins C (37) and D (38), along with a known phomoxanthone A (28). These metabolites displayed low effects on inhibitions of acetylcholinesterase and α-glucosidase, radical scavenging function on DPPH and OH, and antimicrobial activities [33]. A cytotoxic chromone, chaetocyclinone B (39), was characterized from a culture of Phomopsis sp. HNY29-2B, an endophytic fungus obtained from the mangrove plant A. ilicifolius Linn. Compound 39 had cytotoxic activity against PC-3 (IC₅₀ = 8.13 μmol/L) and DU145 (IC₅₀ = 3.59 μmol/L) [36]. The fungus Phomopsis sp. IFB-ZS1-S4 isolated from Scaevola hainanensis Hance extracted a known pestalotiopsone F (40), which showed moderate inhibition on neuraminidase in vitro with IC₅₀ value of 9.90 ± 0.42 μM [37]. Cultivation of Phomopsis sp. xy21 derived from the mangrove Xylocarpus granatum afforded a new xanthone-derived polyketide, phomoxanthone F (41). It showed inhibitory effects on VSV-G pseudotyped viral supernatant (HIV-1) with the inhibitory rate of 16.48 ± 6.67% at a concentration of 20 μM, which was higher than that of the positive control, efavirenz with a rate of 88.54 ± 0.45% [38]. 5-Hydroxy-3-hydroxymethyl-2-methyl-7-methoxychromone (42) was separated from the extracts of Phomopsis sp. (No. Gx-4) derived from mangrove sediment in ZhuHai, Guangdong, China. It showed low cytotoxic activity with IC₅₀ values greater than 50 μmol/mL towards Hep-2 and HepG2. Moreover, it also significantly inhibited the growth of subintestinal vessel plexus (SIV) branches [39]. According to the bioassay-guided fractionation, two new chromones, phomochromones A (43) and B (44) were obtained from an endophytic fungus Phomopsis sp. of Cistus monspeliensis. They displayed remarkable antifungal, antibacterial, and antialgal activities against Microbotryum violaceum, E. coli, Bacillus megaterium, and Chlorella fusca [40]. Chemical investigation of Phomopsis sp. CGMCC No. 5416 isolated from Achyranthes bidentata led to the identification of two novel chromanones, phomochromanones A (45) and B (46). They showed anti-HIV activities with IC₅₀ values of 20.4 and 32.5 μg/mL, and exhibited moderate cytotoxic activities towards A549, MDA-MB-231, and PANC-1 with CC₅₀ values between 62.5–79.3 μg/mL [41]. A new naphtho-γ-pyrone compound, 5-hydroxy-6,8-dimethoxy-2-benzyl-4H-naphtho[2,3-b]-pyran-4-one (47), was obtained from Phomopsis sp. ZSU-H26 of the mangrove tree E. agallocha. This compound showed cytotoxic activity against HEp-2 (IC₅₀ = 10 μg/mL) and HepG2 (IC₅₀ = 8 μg/mL) [42]. The following work on the similar strain Phomopsis sp. (#ZSU-H76) from the same host additionally obtained phomopsis-H76 A (48), which significantly promoted the growth of the branches of SIV [43]. The structures of chromones (35–48) are shown in Figure 2.

2.1.3. Chromanones

Chromanones have been widely studied due to their structural characteristics. They always have important biological and pharmacological activities, including cytotoxic, antimicrobial, antiviral, antioxidant, etc [107]. The culture of a marine fungus Phomopsis sp. (No. ZH-111) from mangrove sediment of Zhuhai, Guangdong, China, obtained a new isochroman, (3R,4S)-3,4-dihydro-4,5,8-trihydroxy-3-methylisocoumarin (49). It could promote the growth of SIV branches and exhibited low cytotoxic activity against Hep-2 and HepG2 cells with IC₅₀ values above 50 mg/mL [44]. Three compounds were separated from Phomopsis sp. (No. Gx-4), including (3R,4S)-3,4-dihydro-8-hydroxy-4-methoxy-3-methylisocoumarin (50), 3,4-dihydro-8-hydroxy-3-methyl-1H-2-benzopyran-1-one-5-carboxylic acid (51), and 5,8-dihydroxy-4-methylcoumarin (52). All isolated compounds showed weak cytotoxic activities against Hep-2 and HepG2 cells with IC₅₀ values above 50 μmol/mL. In addition, compounds 50 and 51 significantly promoted the growth of SIV branches, while 52 inhibited their growth [39]. The endophytic fungus Phomopsis sp. sh917 found in stems of Isodon eriocalyx var. laxiflora obtained (10S)-diaporthin (53), showing antiangiogenic activity that inhibited the angiogenesis process induced by vascular endothelial growth factor (VEGF) [45]. From agar-supported fermentation culture of Phomopsis sp. CMU-LMA derived from Alpinia malacensis, a trihydroxybenzene lactone, cytosporone D (54) was isolated. It showed antimicrobial activity and inhibited E. coli DnaG primase with an IC₅₀ value of 0.25 mM [46]. Alternariol (55) and 5ʹ-hydroxyalternariol (57) were isolated from the endophytic fungus Phomopsis sp. A240 of Taxus chinensis var. mairei. Compound 55 showed low cytotoxicity against SF-268 (IC₅₀ = 88.1 μM), MCF-7 (IC₅₀ = 94.36 μM), and NCI-H460 (IC₅₀ = 81.35 μM). Moreover, compound 57 had antioxidant activity with IC₅₀ values of 42.83 μM [47]. Three compounds were sourced from Endodesmia calophylloides associated with Phomopsis sp. CAFT69, including alternariol (55), alternariol-5-O-methyl ether (56) and 5ʹ-hydroxyalternariol (57). In the range of 1–10 μg/mL, compounds 55–57 had certain motility inhibition and lytic activities on the zoospores of grapevine downy mildew pathogen P. viticola in dose- and time-dependent manner [48]. Phomochromanone C (58) was extracted from Phomopsis sp. CGMCC No. 5416. The bioactivity assay revealed that compound 58 showed cytotoxicity towards A549, MDA-MB-231, and PANC-1 with CC₅₀ values of 69.4, 53.5, and 36.5 μg/mL, and it induced early apoptosis of PANC-1 cancer cells with the rate of 10.52% [41]. The structures of chromanones (49–58) are shown in Figure 2.

2.1.4. Benzofuranones

Benzofuranones are an important intermediate of pharmacophores and drug molecules in natural products. Due to the furan ring being unstable and easy to open and crack, benzofuranones as a pharmaceutical intermediate have been widely concerned by pharmaceutical chemists [108]. The endophytic fungus Phomopsis sp. A123 isolated from mangrove plant Kandelia candel (L.) Druce, produced a novel depsidone, phomopsidone A (66), a known excelsione (67), and four known isobenzofuranones (59–62). All compounds showed different degrees of cytotoxicities against Raji and MDA-MB-435 tumor cells with IC₅₀ values above 18 μM, displayed low antioxidant activities through DPPH radical scavenging effects, and exhibited antifungal activities [50]. The research on bioactive metabolites of marine fungus Phomopsis sp. (No. ZH-111) led to the isolation of 4-(hydroxymethyl)-7- methoxy-6-methyl-1(3H)-isobenzofuranone (63). Compound 63 inhibited the growth of SIV branches and exhibited low cytotoxic activity with IC₅₀ values above 50 mg/mL against Hep-2 and HepG2 cells [44]. Chemical investigations of secondary metabolites from Phomopsis sp. BCC 45011 of X. granatum resulted in the identification of two known metabolites, cytosporones E (64) and P (65). Compounds 64 and 65 showed antimalarial activities against Plasmodium falciparum K1 with IC₅₀ values of 2.02 and 3.65 μg/mL, and 64 exhibited cytotoxicity against MCF-7, NCI-H187, and Vero cells with IC₅₀ values at 29.66, 5.84, and 4.53 μg/mL, respectively [51]. Cultivation of Phomopsis sp. CAFT69 afforded excelsional (68). In the range of 1–10 μg/mL, compound 68 had certain motility inhibition and lytic activities on the zoospores of grapevine downy mildew pathogen P. viticola in dose- and time-dependent manner [48]. Lithocarols A-F (69–74), with highly-oxygenated isobenzofuran skeleton, and isoprenylisobenzofuran A (75), were derived from P. lithocarpus FS508 isolated from a deep-sea sediment collected from the Indian Ocean. These metabolites were cytotoxic and provided IC₅₀ values between 10.5–87.7 μM against HepG-2, MCF-7, SF-268, and A549 cells [52]. The endophytic fungus Phomopsis sp., separated from Paris polyphylla var. yunnanensis, gave three new arylbenzofurans (76–78) and four known compounds, moracin N (79), 2-(2′-methoxy-4′-hydroxy)-aryl-3-methy-6-hydroxybenzofuran (80), iteafuranal B (81), and moracin P (82). Compounds 76–82 showed inhibitory effects on tobacco mosaic virus (TMV) with inhibition rates of 18.6–35.2% [53]. The structures of benzofuranones (59–82) are shown in Figure 3.

2.1.5. Pyrones

Pyrones are a kind of polyketides with six membered oxygen-containing heterocycles. As the precursor of many plants, animals, and microorganisms’ biosynthetic reactions, as well as its outstanding anti-tumor and antibacterial activities, researchers have shown strong interest [109]. Eight compounds were identified from the strain P. asparagi SWUKJ5.2020 isolated from medicinal plant Kadsura angustifolia, including five new 2-pyrone compounds, phomaspyrones A-E (83 and 85–88), along with three known metabolites, macommelin-8,9-diol (84), macommelin-9-ol (89), and macommelin (90). All isolated metabolites showed significant cytotoxic activities against six tested tumor cells (A549, Raji, HepG2, MCF-7, HL-60 and K562) with IC₅₀ values of 1.0–26.8 μg/mL. However, phomaspyrone C (86) display better activity than the other compounds with IC₅₀ values of 1.0–2.2 μg/mL against all tested cells [54]. The endophytic fungus Phomopsis sp. isolated from the plant Cistus salvifolius, yielded four new pyrenocines, pyrenocines J-M (91–94). They exhibited antibacterial and algicidal activities against E. coli, B. megaterium, and C. fusca. The antifungal assay showed that 92 and 94 were active against M. violaceum, and compounds 91–92, and 94 were active against Septoria tritici [55]. An unusual pyrone metabolite, phomopsis-H76 C (95), was isolated from Phomopsis sp. (#zsu-H76), which inhibited the growth of SIV branch [43]. The structures of pyrones (83–95) are shown in Figure 3.

2.1.6. Quinones

Quinones are natural bioactive molecules with unsaturated cyclic diketones, such as cytotoxic, antimicrobial, antiviral and anti-inflammatory activities. In recent years, the development of new anti-tumor quinones and their derivatives as lead compounds has become a hot topic [110,111]. Studies of the endophytic fungus Phomopsis sp. HCCB04730 associated with stems of Radix Stephaniae Japonicae obtained six known naphthoquinones 96–101. These metabolites showed cytotoxic activities against A549, MDA-MB-231 and PANC-1 cancer cells with IC₅₀ values of 1.1–120.5 μg/mL, and anti-HIV activities with IC₅₀ values between 1.6–26.8 μg/mL [56]. Altersolanol B (102) was separated from P. longicolla HL-2232 of leaves of Bruguiera sexangula var. rhynchopetala collected from the South China Sea. Compound 102 showed antibacterial activity against Vibrio parahaemolyticus (MIC = 2.5 μg/mL) and Vibrio anguillarum (MIC = 5 μg/mL) [57]. A cytotoxic anthraquinone described as altersolanol A (103), was extracted from Phomopsis sp. (PM0409092) isolated from Nyctanthes arbor-tristis. Compound 103 had cytotoxic activity to 34 human cancer cells in vitro and gave the mean IC₅₀ (IC₇₀) value of 0.005 μg/mL (0.024 μg/mL) [58]. A new tetrahydroanthraquinone, named (2R,3S)-7-ethyl-1,2,3,4-tetrahydro-2,3,8-trihydroxy-6-methoxy-3-methyl-9,10-anthracenedione (104), was separated from Phomopsis sp. PSU-MA214 associated with mangrove plant Rhizophora apiculata. Compound 104 was found to have low cytotoxic activity against MCF-7 and antibacterial activity against S. aureus ATCC25923 and methicillin-resistant Staphylococcus aureus SK1 [60]. The extraction of fungus P. foeniculi associated with Foeniculum vulgare in Bulgaria, resulted in the isolation of two octaketides anthracenones, altersolanols A (103) and J (105). They exhibited phytotoxic activities by leaf puncture bioassay [59]. Four known compounds were isolated from Phomopsis sp. derived from Notobasis syriaca, including 2-hydroxymethyl-4β,5α,6β-trihydroxycyclohex-2-en (106), (−)-phyllostine (107), (+)-epiepoxydon (108), and (+)-epoxydon monoacetate (109). All metabolites exhibited antifungal (M. violaceum), antibacterial (E. coli, B. megaterium), and algicidal activities (C. fusca), but 106 and 108 were inactive against M. violaceum [61]. A novel dihydronaphthalenone, phomonaphthalenone A (110), was derived from Phomopsis sp. HCCB04730. In terms of bioactive evaluation, compound 110 showed weak cytotoxic activity and moderate inhibitory activity on HIV with IC₅₀ value of 11.6 μg/mL [56]. Ampelanol (111) was extracted from Phomopsis sp. HNY29-2B isolated from mangrove plant A. ilicifolius. Compound 111 showed antibacterial activity towards B. subtilis and S. aureus with MIC of 25 and 50 μM [62]. The structures of quinones (96–111) are shown in Figure 4.

2.1.7. Phenols

Phenols are a kind of secondary metabolites which are widely distributed and have important physiological functions. They normally have antioxidant activity and play an important role in food industry [112]. Phomosine K (112) isolated from a Phomopsis strain showed remarkable antibacterial activity against Legionella pneumophila Corby and E. coli K12 [61]. Five known metabolites, phomosines A-D (113–116) and phomosine I (117) were isolated from a Phomopsis strain derived from Ligustrum vulgare. They had antibacterial and antifungal activities against B. megaterium and M. violaceum, except 116 was not active against B. megaterium. Moreover, compounds 113 and 116 inhibited the growth of algae [63]. Two new diphenyl ethers (118–119) were obtained from the culture of P. asparagi isolated from the rhizome of Paris polyphylla var. yunnanensis, collected in Kunming, Yunnan, China. These compounds displayed anti-methicillin-resistant S. aureus (anti-MRSA) activities with inhibition zone diameters (IZD) 10.8 ± 2.0 and 11.4 ± 1.8 mm, respectively [64]. Three new diphenyl ethers, 4-(3-methoxy-5-methylphenoxy)-2-(2-hydroxyethyl)-6-methylphenol (120), 4-(3-hydroxy-5-methylphenoxy)-2-(2-hydroxyethyl)-6-methylphenol (121), and 4-(3-methoxy-5-methylphenoxy)-2-(3-hydroxypropyl)-6-methylphenol (122), were extracted from P. fukushii of Paris polyphylla var. yunnanensis. Compounds 120–122 showed anti-MRSA activities and provided an IZD of 20.2 ± 2.5 mm, 17.9 ± 2.2 mm, and 15.2 ± 1.8 mm, respectively [65]. An endophytic fungus P. fukushii, separated from the rhizome of Paris polyphylla var. yunnanensis, gave three new isopentylated diphenyl ethers (123–125). Compounds (123–125) had notable anti-MRSA activities, and their IZD were 21.8 ± 2.4 mm, 16.8 ± 2.2 mm, and 15.6 ± 2.0 mm, respectively [66]. Two new diphenyl ethers (126–127) were obtained from the fermentation products of P. fukushii isolated from Paris polyphylla var. yunnanensis. The results of the anti-MRSA activities assay revealed that compounds 126 and 127 gave IZD of 13.8 ± 1.5 mm and 14.6 ± 1.6 mm, respectively [67]. Three new napthalene derivatives (128–130) were separated from P. fukushii, an endophytic fungus isolated from Paris polyphylla var. yunnanensis. Compounds 128–130 showed anti-MRSA activities with MCI values of 4, 4 and 6 mg/mL [68]. From fermentation products of the fungus Phomopsis sp. associated with Paris polyphylla var. yunnanensis, two new naphthalene derivatives (131–132) were obtained. Compounds 131–132 displayed anti-MRSA activities with IZD of 14.5 ± 1.2 and 15.2 ± 1.3 mm [69]. A culture of the marine fungus P. lithocarpus FS508 isolated from deep-sea sediment collected from Indian Ocean, obtained a new benzophenone, tenellone H (133). It showed cytotoxicity against HepG-2 (IC₅₀ = 16 μM) and A549 (IC₅₀ = 17.6 μM) [70].

The new metabolite, 16-acetoxycytosporone B (134), was sourced from Phomopsis sp. YM 355364 associated with Aconitum carmichaeli. In the bioassay, compound 134 had remarkable antifungal activity towards C. albicans, Hormodendrum compactum, and Trichophyton gypseum with MIC values of 32, 128, and 512 μg/mL [71]. Cultivation of Phomopsis sp. 0391 isolated from the stems of Paris polyphylla var. yunnanensis afforded cytosporone B (135) and dothiorelone A (136). These two compounds showed notable lipase inhibition and gave IC₅₀ values of 115 and 275 μg/mL with Orlistat (IC₅₀ = 43 μg/mL) as positive control [72]. Cytosporone B (135) was extracted from the cultivation of Phomopsis sp. PSU-H188, an endophytic fungus from Hevea brasiliensis. 135 showed protective effect on INS-1 832/13 pancreatic β-cells (EC₅₀ = 11.08 μM) [73]. Two diastereomeric antineoplastic tenellone derivatives identified as lithocarpinols A (137) and B (138), were isolated from P. lithocarpus FS508, a deep-sea derived fungus derived from a sediment collected in the Indian Ocean. During the cytotoxic assay, compounds 137–138 showed inhibitory effects against HepG-2, MCF-7, SF-268, and A549 cancer cells with IC₅₀ values ranging from 9.4 to 35.9 μmol/L [74]. Phomoindene A (139), a new indene derivative, was produced by Phomopsis sp. (No. GX7-4A) from the mangrove sediment of BeiHai, GuangXi, China. Compound 139 showed weak cytotoxicity againt KB, KBv 200, and MCF-7 cancer cells with IC₅₀ values greater than 50 μmoL/mL [75]. Then, 4-Hydroxybenzaldehyde (140) was extracted from a strain of Phomopsis sp. YM 355364. The antimicrobial activities of 140 provided MIC values at 256 and 128 μg/mL against B. subtilis and P. oryzae [26]. An investigation of the extracts from P. longicolla HL-2232, afforded a new biphenyl derivative, 5,5′-dimethoxybiphenyl-2,2′-diol (141). Compound 141 displayed antibacterial activity against V. parahaemolyticus with MIC value of 10 μg/mL [57]. A known phenylethyl alcohol, phomonitroester (142), was derived from Phomopsis sp. PSU-MA214, exhibiting cytotoxicity with IC₅₀ value of 43 μg/mL against KB [60]. Cytosporone U (143) was isolated from the fermentation products of Phomopsis sp. FJBR-11. This compound displayed inhibitory effect on TMV with IC₅₀ value of 144.6 μg/mL [76]. Altenusin (144) was extracted from Phomopsis sp. CAFT69, possessing a certain motility inhibitory and lytic activity against the zoospores of grapevine downy mildew pathogen P. viticola between 1–10 μg/mL [48]. Cosmochlorins D (145) and E (146) produced by the endophytic fungus Phomopsis sp. N-125 of Ficus ampelas, showed significant cytotoxic activities against HL60 cells with IC₅₀ values of 6.1 and 1.8 μM, and displayed growth-inhibition activities [77]. The structures of phenols (112–146) are shown in Figure 5.

2.1.8. Oblongolides

Oblongolides are a kind of natural active products with novel norsesquiterpene γ-lactone. At present, oblongolides are relatively less reported than other kinds of polyketides. Most of them exist in the fungi of Phomopsis, and mainly have cytotoxic activities [113]. Three new oblongolides, oblongolides Z (147) and Y (148) and 2-deoxy-4α-hydroxyoblongolide X (154), were extracted from Phomopsis sp. BCC 9789 isolated from a wild banana (Musa acuminata) leaf. Compound 147 was found to have inhibitory effect on anti-herpes simplex virus type 1 (HSV-1) with IC₅₀ value of 14 μM and showed cytotoxicities with IC₅₀ values at 26–60 μM towards KB, BC, NCI-H187, and Vero cancer cells. Compound 148 was cytotoxic against BC (IC₅₀ = 48 μM) and 154 showed anti-HSV-1 activity with IC₅₀ value of 76 μM [78]. Five metabolites, oblongolides C1 (149), P1 (150), X1 (151), and C (153), along with 6-hydroxyphomodiol (152), were separated from the strain Phomopsis sp. XZ-01, an endophytic fungus of Camptotheca acuminate. Compounds 149–153 displayed different degrees of selective inhibition in cytotoxicities against HepG2 and A549 [79]. The structures of oblongolides (147–154) are shown in Figure 5.

2.1.9. Unclassified Polyketides

Five compounds were obtained from Phomopsis sp. BCC 45011, including phomoxydiene C (155), 1893 A (156), mycoepoxydiene (157), deacetylmycoepoxydiene (158), and phomoxydiene A (159). All metabolites, except 156, showed strong antimalarial activities against P. falciparum K1 with IC₅₀ values at 2.41–3.52 μg/mL and cytotoxicities against KB, MCF-7, NCI-H187, and Vero with IC₅₀ values between 1.49–45.5 μg/mL [51]. Seven new polyoxygenated cyclohexenoids, phomopoxides A-G (160–166) were obtained from the fermentation products of Phomopsis sp. YE3250 isolated from Paeonia delavayi. All compounds exhibited α-glycosidase inhibition with IC₅₀ values from 1.47 to 3.16 mM, cytotoxic activities against Hela, MCF-7, and NCI-H460 cancer cell lines, and moderate antifungal activities against C. albicans, Aspergillus niger, P. oryzae, Fusarium avenaceum, and H. compactum [80]. A new geranylcyclohexenetriol, named phomentrioloxin (167), was obtained from Phomopsis sp. of the plant Carthamus lanatus. This compound showed phytotoxic activity and might be considered a potential mycoherbicide [81]. A new natural cyclopentenone, phomotenone (168) was produced by Phomopsis sp. Compound 168 displayed remarkable antifungal, antibacterial, and antialgal activities against M. violaceum, E. coli, B. megaterium, and C. fusca [40]. The cytotoxicity-guided investigation of the fungus Phomopsis sp. DC275 of Vitis vinifera yielded two new furanones, phomopsolidones A (170) and B (171), and a known phomopsolide B (169). All these metabolites showed weak phytotoxic and antibacterial activities [82]. The structures of unclassified polyketides (155–171) are shown in Figure 6.

2.2. Terpenoids

Terpenoids are a kind of natural bioactive substances with isoprene as scaffold, which are widely distributed and rich in species [114,115]. Herein, a total of 38 terpenoids, including three monoterpenoids, 25 sesquiterpenoids, seven diterpenoids, and three triterpenoids, were isolated from various Phomopsis strains, accounting for 15% of all the described metabolites, second only to polyketides. It is worth noting that some terpenoids showed interesting bioactivities, such as enzyme inhibitory and anti-inflammatory activities.

2.2.1. Monoterpenoids

Monoterpenoids and their derivatives have a variety of biological activities, such as cytotoxic, antimicrobial, and anti-inflammatory, which have potential application value in clinical medicine [116]. Acropyrone (172) was extracted from culture of Phomopsis sp. HNY29-2B. Compound 172 showed antibacterial activity towards B. subtilis (MIC = 25 μM) and P. aeruginosa (MIC = 50 μM) [62]. A phytotoxic pentaketide monoterpenoid, nectriapyrone (173), was produced by the fungus P. foeniculi [59]. According to bioassay-guided procedure, a known compound, (1S,2S,4S)-trihydroxy-p-menthane (174) was obtained from Phomopsis sp., displaying antialgal activity against C. fusca and antibacterial activity against E. coli and B. megaterium [40]. The structures of monoterpenoids (172–174) are shown in Figure 7.

2.2.2. Sesquiterpenoids

Sesquiterpenoids are the most abundant members of natural terpenoids because of their various structures and notable bioactivities. The chemical components of sesquiterpenoids had been found in plants, animals, microorganisms and marine organisms [117,118]. A series of sesquiterpenoids (175–184 and 195) were isolated from a strain of Phomopsis sp. TJ507A obtained from Phyllanthus glaucus. All compounds exhibited the inhibitory rates in the range of 19.4% to 43.8% against β-site amyloid precursor protein cleaving enzyme 1 (BACE1) at the concentration of 40 μM [83]. From the endophytic fungus P. cassia associated with Cassia spectabilis, two new diastereoisomeric cadinanes sesquiterpenes (185–186), (7S,10R)-3-hidroxicalamen-8-one (187), and aristelegone-A (188) were isolated. Compounds 185–188 showed antifungal activities towards Cladosporium cladosporioides and Cladosporium sphaerospermum, and acetylcholinesterase inhibitory activities [84]. Four metabolites were separated from P. archeri of Vanilla albidia, including three new sesquiterpenes, phomoarcherins A-C (189–191), and a known kampanol A (192). The cytotoxic activites of 189–192 provided IC₅₀ values from 0.1 to 19.6 μg/mL against five cholangiocarcinoma cells (KKU-100, KKU-M139, KKU-M156, KKU-M213, and KKU-M214), and 189–190 showed little activities against the KB with IC₅₀ values at 42.1 and 9.4 μg/mL. Compound 190 displayed antimalarial activity against P. falciparum (IC₅₀ = 0.79 μg/mL) [85]. A new sesquiterpene, (+)-S-1-methyl-abscisic-6-acid (193), and a known (+)-S-abscisic acid (194), were extracted from P. amygdali of Call midge. Compounds 193–194 showed antibacterial activities against P. aeruginosa 2033E with MIC at 30 and 58 μg/mL [86]. Curcumol (196), isolated from P. castaneae-mollissimae GQH87 derived from medicinal plant Artemisia annua, showed cytotoxicity against MCF-7, HepG2, and A549 with IC₅₀ values of 25.73, 65.18, and 178.32 μg/mL, respectively [87]. The cultivation of fungus Phomopsis sp. CAFT69, afforded two bioactive compounds, 9-hydroxyphomopsidin (197) and phomopsidin (198). Both of them showed motility inhibition and lytic activities on the zoospores of grapevine downy mildew pathogen P. viticola [48]. AA03390 (199) was isolated from a strain of P. lithocarpus FS508. The compound had low cytotoxicity with IC₅₀ values of 25.5–29.6 μM against HepG-2, MCF-7, SF-268, and A549 [70]. The structures of sesquiterpenoids (175–199) are shown in Figure 7.

2.2.3. Diterpenoids

Diterpenoids are a kind of terpenoids with various skeletons. They possess significant pharmacological activities, such as cytotoxic, antimicrobial, and anti-inflammatory activities [119]. A new diterpenes, libertellenone J (200), was derived from fungus Phomopsis sp. S12 isolated from Illigera rhodantha. This compound showed anti-inflammatory activity by reducing the production of NO, IL-1β, IL-6 and TNF-α, and inhibiting MAPKs and NF-κB pathways [88]. Four metabolites were extracted from Phomopsis sp. S12, including three new pimaranes, libertellenone T (202), pedinophyllols K (203) and L (204), together with a known compound, libertellenone C (201). Compounds 201–204 showed different degrees of anti-inflammatory activities against inhibiting the production of inflammatory factors (IL-1β, IL-6) by lipopolysaccharide in macrophages [89]. Secondary metabolites from fungus P. amygdali contained two known compounds, fusicoccin J (205) and 3α-hydroxyfusicoccin J (206). Biologically, compounds 205–206 showed antibacterial activities against P. aeruginosa 2033E with MICs at 26 μg/mL [86]. The structures of diterpenoids (200–206) are shown in Figure 8.

2.2.4. Triterpenoids

Triterpenoids are a kind of organic compounds widely found in nature. They have attracted the attention of researchers because their structural diversity and rich bioactivities [120]. A new euphane triterpenoid, 3S,22R,26-trihydroxy-8,24E-euphadien-11-one (207), was isolated from P. chimonanthi obtained from medicinal plant Tamarix chinensis in the yellow river delta, Dongying. Compound 207 exhibited cytotoxicity against A549, MDA-MB-231, and PANC-1 cancer cells with IC₅₀ values of 20.32, 19.87 and 30.45 μM, respectively [90]. The fungus Phomopsis sp. SNB-LAP1-7-32, occurring from plant Diospyros carbonaria, produced a first lupane-type triterpenoid, betulinic acid (208). Compound 208 displayed antiviral activity on inhibiting RNA-dependant RNA polymerase with IC₅₀ values of 4.3 μM and cytotoxicity against HCT-116 and MRC-5 [91]. Oleanolic acid (209) was extracted from P. castaneae-mollissimae GQH87, which showed cytotoxicity against MCF-7, HepG2, and A549 with IC₅₀ values of 16.61, 39.53, and 40.08 μg/mL, respectively [87]. The structures of triterpenoids (207–209) are shown in Figure 8.

2.3. Steroids

Steroids are secondary metabolites with a variety of chemical structures and biological activities. At present, many researchers try to find steroidal metabolites as potential lead compounds in drug design [121]. Till now, only nine steroids were isolated from Phomopsis and showed antifungal, anti-inflammatory, and antiviral activities. Five steroids were derived from culture of Phomopsis sp., an endophytic fungus separated from A. carmichaeli, including (14β,22E)-9,14-dihydroxyergosta-4,7,22-triene-3,6-dione (210), (5α,6β,15β,22E)-6-ethoxy-5,15-dihydroxyergosta-7,22-dien-3 one (211), calvasterols A (212) and B (213), and ganodermaside D (214). All isolated compounds displayed different degrees of selective antifungal activities against C. albicans, A. niger, P. oryzae, F. avenaceum, H. compactum, and T. gypseum with MIC values between 64–512 μg/mL [92]. Dankasterone A (215) and 3β,5α,9α-trihydroxy-(22E,24R)-ergosta- 7,22-dien-6-one (216) were isolated from Phomopsis sp. YM 355364. Compound 215 showed anti-influenza activity against H5N1pseudovirus (IC₅₀ = 3.56 μM). Compounds 215–216 showed antifungal activities against C. albicans, P. oryzae, H. compactum, and T. gypseum with MIC values of 64–512 μg/mL [71]. A new functionalized ergostane-type steroid, named phomopsterone B (217), was obtained from Phomopsis sp. TJ507A isolated from medicinal plant P. glaucus. Compound 217 showed anti-inflammatory activity by inhibiting iNOS enzyme with an IC₅₀ value of 1.49 μM [93]. Cyathisterol (218) was extracted from Phomopsis sp. YM 355364, displaying moderate antifungal activity toward P. oryzae (MIC = 128 μg/mL) [26]. The structures of steroids (210–218) are shown in Figure 9.

2.4. Macrolides

Macrolides are a class of medicinal compounds containing macrolactone ring structures, many of which are used as antifungal and antibacterial drugs in clinic, such as erythromycins [122]. Nowadays, a large number of macrolide antibiotics are widely used in the treatment of human diseases. Eight secondary metabolites were obtained from Phomopsis and showed cytotoxic, antimicrobial, and enzyme inhibitory activities. Three cytotoxic polyketides, Sch-642305 (219), LMA-P1 (220), and benquoine (221), were found in the endophytic fungus Phomopsis sp. CMU-LMA of Alpinia malaccensis. Compounds 219 and 221 also displayed antimicrobial activities [94]. The endophytic fungus Phomopsis sp. IFB-ZS1-S4 provided a known aspergillide C (222), which had moderate inhibitory effect on neuraminidase in vitro with IC₅₀ value of 5.59 μM [37]. Four highly oxygenated tenellone-macrolide conjugated dimers, lithocarpins A-D (223–226), were obtained from P. lithocarpus FS508 isolated from the deep-sea sediment sample collected in the Indian Ocean. All metabolites (223–226) showed cytotoxic activities against three human tumor cells (SF-268, MCF-7, and HepG-2) with IC₅₀ values in the range of 17.0–52.2 μM [95]. The structures of macrolides (219–226) are shown in Figure 10.

2.5. Alkaloids

Alkaloids are important nitrogen-containing organic compounds widely existing in microorganisms. At present, some alkaloids have been used to treat human diseases [123]. A total of 16 alkaloids have been isolated from Phomopsis and display various important bioactivities, such as cytotoxic, antibacterial, anti-inflammatory activities. Two compounds with special carbon skeleton, named phomopchalasins B (227) and C (232) were isolated from Phomopsis sp. shj2, an endophytic fungus obtained from the stems of Isodon eriocalyx var. laxiflora. Compound 232 showed cytotoxic activity against HL-60, SMMC-7721, and A-549 with IC₅₀ values of 14.9, 22.7, and 21.1 μM, and displayed anti-inflammatory activity by reducing NO production (IC₅₀= 11.2 μM). In addition, compounds 227 and 232 showed antimigratory activities against MDA-MB-231 with IC₅₀ values of 19.1 and 12.7 μM [96]. Chemical investigation of Phomopsis spp. xy21 and xy22 obtained from leaves of the mangrove tree X. granatum, collected in Trang Province, Thailand, led to the isolation of a new cytochalasin, phomopsichalasin G (228). It showed cytotoxicities against HCT-8, HCT- 8/T, A549, MDA-MB-231, and A2780 cancer cells with IC₅₀ values between 3.4–8.6 μM [97]. Three known compounds, namely 18-metoxycytochalasin J (229), cytochalasins H (230) and J (231), were obtained from Phomopsis sp. isolated from the nut of Garcinia kola. These three compounds exhibited cytotoxicities against HeLa (LC₅₀ = 3.66–35.69 μg/mL) and Vero (LC₅₀ = 73.88–129.10 μg/mL), and different degrees of antibacterial activities against six bacterial pathogens (Vibrio cholera SG24, V. cholera CO6, V. cholera NB2, V. cholera PC2, Shigella flexneri SDINT, and S. aureus ATCC 25923) [98]. The cytochalasins, epoxycytochalasin H (234) and cytochalasin N (233) and H (230), were extracted from Phomopsis sp. By254 derived from the root of Gossypium hirsutum. They showed remarkable antifungal activities with IC₅₀ values between 0.1–50 μg/mL against S. sclerotiorum, Bipolaris maydis, Fusarium oxysporum, B. cinerea, Bipolaris sorokiniana, Gaeumannomyces graminis var. tritici and Rhizoctonia cerealis [99]. Cytochalasins H (230) and J (231), and alternariol (55) were extracted from Phomopsis sp. of Senna spectabilis and showed anti-inflammatory activities by inhibiting the production of reactive oxygen species (ROS). Compound 230 also showed antifungal and acetylcholinesterase enzyme (AChE) inhibitory activities [49]. Cytochalasin J (231) was derived from P. asparagi of plant Peperomia sui and exhibited antiandrogen activity (IC₅₀ = 6.2 μM) [100]. The antibacterial diaporthalasin (235) was extracted from Phomopsis sp. PSU-H188, showing anti-MRSA activity with MIC of 4 μg/mL [73]. A phenylfuropyridone racemate, (+)-tersone E (236), and a known ent-citridone A (237), were separated from P. tersa FS441 derived from deep-sea sediment in the Indian Ocean. Compound 236 showed cytotoxicity with IC₅₀ values at 32.0, 29.5, 39.5 and 33.2 μM towards SF-268, MCF-7, HepG-2, and A549 cancer cells. Compounds 236–237 had antibacterial activities against S. aureus with MIC value of 31.2 and 31.5 μg/mL [101]. Two new chromenopyridine derivatives, phochrodines C (238) and D (239) with 5H-chromeno[4,3-b]pyridine, were isolated from Phomopsis sp. 33# associated with the bark of R. stylosa in the South China Sea. Compounds 238–239 displayed anti-inflammatory activities with IC₅₀ values of 49 and 51 μM by inhibiting nitric oxide production. Moreover, compound 239 also showed antioxidant activity with IC₅₀ value at 34 μM [102]. A novel depsipeptide, PM181110 (240), was obtained from P. glabrae of Pongamia pinnata. It showed anticancer activity towards 40 human cancer cells in vitro (mean IC₅₀ = 0.089 μM) and 24 human tumor xenografts ex vivo (mean IC₅₀ = 0.245 μM) [103]. Fusaristatin A (241) was separated for the first time from P. longicolla S1B4, showing antibacterial activity against X. oryzae [34]. Exumolide A (242) from the strain Phomopsis sp. (No. ZH-111) significantly promoted the growth of SIV branches and showed low cytotoxic activity against Hep-2 and HepG2 [44]. The structures of alkaloids (227–242) are shown in Figure 11.

2.6. Flavonoids

Flavonoids are a kind of natural active substances of polyphenols. They are relatively less occurred in fungi [124]. In this review, only four flavonoids, quercetin (243) (Figure 12), luteolin (244), naringenin (245), and luteolin-7-O-glucoside (246) were isolated from P. castaneae-mollissimae GQH87. They displayed cytotoxic activities against MCF-7, HepG2, and A549 with IC₅₀ values between 18.7 and 169.8 μg/mL [87].

3. Bioactive Secondary Metabolites from Diaporthe spp.

In the last ten years, a total of 106 bioactive secondary metabolites have been isolated from the genus Diaporthe (

Table 2. The bioactive secondary metabolites of the genus Diaporthe during 2010–2019.

Number	Structural Types	Compounds	Strains	Habitats (T/M a)	Activities	Refs.
247	Xanthones	3,8-Dihydroxy-6-methyl-9-oxo-9H-xanthene-1-carboxylate	Diaporthe sp. SCSIO 41011	Rhizophora stylosa (M)	Anti-IAV	[125]
28		Phomoxanthone A	Diaporthe sp. GZU-1021 D. phaseolorum FS431	Chiromanteshae- matochir (M)Sediment (M)	Anti-inflammatory Cytotoxic	[126] [127]
248	Chromones	Penialidin A	Diaporthe sp. GZU-1021	Chiromanteshae matochir (M)	Anti-inflammatory	[126]
35		(+)-Phomopsichin A	D. phaseolorum SKS019	Acanthus ilicifolius (M)	Inhibitory effects on osteoclastogenesis	[128]
249		(−)-Phomopsichin A	D. phaseolorum SKS019	A. ilicifolius (M)	Inhibitory effects on osteoclastogenesis	[128]
250		(+)-Phomopsichin B	D. phaseolorum SKS019	A. ilicifolius (M)	Inhibitory effects on osteoclastogenesis	[128]
36		(−)-Phomopsichin B	D. phaseolorum SKS019Diaporthe sp. GZU-1021	A. ilicifolius (M) Chiromateshaem atochir (M)	Inhibitory effects on osteoclastogenesis Anti-inflammatory	[128] [126]
251		Diaporchromanone C	D. phaseolorum SKS019	A. ilicifolius (M)	Inhibitory effects on osteoclastogenesis	[128]
252		Diaporchromanone D	D. phaseolorum SKS019	A. ilicifolius (M)	Inhibitory effects on osteoclastogenesis	[128]
40		Pestalotiopsone F	Diaporthe sp. SCSIO 41011	R. stylosa (M)	Anti-IAV	[125]
253		Pestalotiopsone B	Diaporthe sp. SCSIO 41011 D. pseudomangiferaea	R. stylosa (M) Tylophora ouata (T)	Anti-IAV Antifibrotic	[125] [129]
254		Diaportheone A	Diaporthe sp. P133	Pandanus amaryllifolius (T)	Antitubercular	[130]
255		Diaportheone B	Diaporthe sp. P133	P. amaryllifolius (T)	Antitubercular	[130]
53	Chromanones	(10S)-Diaporthin	D. terebinthifolii LGMF907	Schinus terebinthifolius (T)	Antibacterial	[131]
256		Orthosporin	D. terebinthifolii LGMF907	S. terebinthifolius (T)	Antibacterial	[131]
54		Cytosporone D	D. pseudomangiferaea	T. ouata (T)	Cytotoxic, Antioxidant Antidiabetic	[129]
257		Mucorisocoumarin A	D. pseudomangiferaea	T. ouata (T)	Antifibrotic	[129]
258		3,4-Dihydro-8-hydroxy-3,5-dimethyl-isocoumarin	D. eres	Hedera helix (T)	Phytotoxic	[132]
259		Diportharine A	Diaporthe sp.	Datura inoxia (T)	Antioxidant	[133]
260	Furanones	(1R,2E,4S,5R)-1-[(2R)-5-Oxotetrahydrofuran-2-yl]-4,5-dihydroxy-hex-2-en-1-yl(2E)-2-methylbut-2-enoate	Diaporthe sp. SXZ-19	Camptotheca acuminate (T)	Cytotoxic	[134]
261		Butyl 5-[(1R)-1-hydroxyethyl]-γ-oxofuran-2-butanoate	Diaporthe sp. SXZ-19	C. acuminate (T)	Cytotoxic	[134]
262		3,4-Dihydro-5ʹ-[(1R)-1-hydroxyethyl] [2,2ʹ-bifuran]-5(2H)-one	Diaporthe sp. SXZ-19	C. acuminate (T)	Cytotoxic	[134]
263		3,4-Dihydro-5ʹ-[(1R)-1-hydroxymethylethyl][2,2ʹ-bifuran]-5(2H)-one	Diaporthe sp. SXZ-19	C. acuminate (T)	Cytotoxic	[134]
264		Kongiidiazadione	D. Kongii	Carthamus lanatus (T)	Phytotoxic, Antibacterial	[135]
265	Pyrones	Phomopsolide A	D. maritima	Picea mariana(T) Picea rubens (T)	Antifungal, Antibiotic	[136]
169		Phomopsolide B	D. maritima	P. mariana (T) P. rubens (T)	Antifungal, Antibiotic	[136]
266		Phomopsolide C	D. maritima	P. mariana (T)P. rubens (T)	Antifungal, Antibiotic	[136]
267		(S,E)-6-(4-Hydroxy-3-oxopent-1-en-1-yl)-2H-pyran-2-one	D. maritima	P. mariana (T) P. rubens (T)	Antifungal, Antibiotic	[136]
268		7-Hydroxy-6-metoxycoumarin	D. lithocarpus	Artocarpus heterophyllus (T)	Antifungal	[137]
269		Coumarin	D. lithocarpus	A. heterophyllus (T)	Antibacterial	[137]
270	Quinones	Phyllostine acetate	D. miriciae	Cyperus iria (T)	Antifeedant, Contact toxicity, Oviposition deterrent activities	[138]
107		(−)-Phyllostine	D. miriciae	C. iria (T)	Antifeedant, Contact toxicity, Oviposition deterrent activities	[138]
271		Biatriosporin N	Diaporthe sp. GZU-1021	Chiromanteshae- matochir (M)	Anti-inflammatory	[126]
272		Emodin	D. lithocarpus	A. heterophyllus (T)	Cytotoxic, Antibacterial	[137]
273		1,2,8-Trihydroxyanthraquinone	D. lithocarpus	A. heterophyllus (T)	Antibacterial	[137]
274		(+)-2,2′-Epicytoskyrin A	Diaporthe sp. GNBP-10	Uncaria gambir Roxb (T)	Antifungal	[139]
275		Cytoskyrin C	Diaporthe sp.	Anoectochilus roxburghii (T)	Cytotoxic, Activating the NF-κB pathway	[140]
276		(+)-Epicytoskyrin	Diaporthe sp.	A. roxburghii (T)	Cytotoxic, Activating the NF-κB pathway	[140]
277	Phenols	Tyrosol	D. helianthin D. eres	Luehea divaricate (T) Vitis vinifera (T)	Antagonistic Phytotoxic	[141] [142]
278		2,5-Dihydroxybenzyl alcohol	D. vochysiae LGMF1583	Vochysia divergens (T)	Cytotoxic	[143]
140		4-Hydroxybenzaldehyde	D. eres	V. vinifera (T)	Phytotoxic	[142]
279		p-Cresol	D. eres	V. vinifera (T)	Phytotoxic	[142]
280		4-Hydroxybenzoic acid	D. eres	V. vinifera (T)	Phytotoxic	[142]
281		Arbutin	D. lithocarpus	A. heterophyllus (T)	Cytotoxic	[137]
113		Phomosine A	Diaporthe sp. F2934	Siparuna gesnerioides (T)	Antibacterial	[144]
115		Phomosine C	Diaporthe sp. F2934	S. gesnerioides (T)	Antibacterial	[144]
282		Flavomannin-6,6′-di-O-methyl ether	D. melonis	Annona squamosal (T)	Antimicrobial	[145]
283		Acetoxydothiorelone B	D. pseudomangiferaea	T. ouata (T)	Antifibrotic	[129]
284		Dothiorelone B	D. pseudomangiferaea	T. ouata (T)	Antifibrotic	[129]
285		Dothiorelone L	D. pseudomangiferaea	T. ouata (T)	Antifibrotic	[129]
286		Dothiorelone G	D. pseudomangiferaea	T. ouata (T)	Antifibrotic	[129]
287		Diaporthol A	Diaporthe sp. ECN-137	Phellodendron amurense (T)	Anti-migration	[146]
288		Diaporthol B	Diaporthe sp. ECN-137	P. amurense (T)	Anti-migration	[146]
289		Tenellone C	Diaporthe sp. SYSU-HQ3	Excoecaria agallocha (M)	MptpB inhibitory	[147]
290		Tenellone D	Diaporthe sp. SYSU-HQ3	E. agallocha (M)	Anti-inflammatory	[148]
291		Diaporindene A	Diaporthe sp. SYSU-HQ3	E. agallocha (M)	Anti-inflammatory	[148]
292		Diaporindene B	Diaporthe sp. SYSU-HQ3	E. agallocha (M)	Anti-inflammatory	[148]
293		Diaporindene C	Diaporthe sp. SYSU-HQ3	E. agallocha (M)	Anti-inflammatory	[148]
294		Diaporindene D	Diaporthe sp. SYSU-HQ3	E. agallocha (M)	Anti-inflammatory	[148]
75		Isoprenylisobenzofuran A	Diaporthe sp. SYSU-HQ3	E. agallocha (M)	Anti-inflammatory	[148]
295	Oblongolides	Oblongolide D	Diaporthe sp. SXZ-19	C. acuminate (T)	Cytotoxic	[134]
296		Oblongolide H	Diaporthe sp. SXZ-19	C. acuminate (T)	Cytotoxic	[134]
297		Oblongolide P	Diaporthe sp. SXZ-19	C. acuminate (T)	Cytotoxic	[134]
298		Oblongolide V	Diaporthe sp. SXZ-19	C. acuminate (T)	Cytotoxic	[134]
299	Unclassified polyketides	Phomentrioloxin B	D. gulyae	C. lanatus (T)	Phytotoxic	[149]
300		epi-Isochromophilone II	Diaporthe sp. SCSIO 41011	R. stylosa (M)	Cytotoxic	[150]
301		Isochromophilone D	Diaporthe sp. SCSIO 41011	R. stylosa (M)	Cytotoxic	[150]
302	Monoterpenoids	(1R,2R,4R)-Trihydroxy-p-menthane	Diaporthe sp. SXZ-19	C. acuminate (T)	Cytotoxic	[134]
303		Gulypyrone A	D. gulyae	C. lanatus (T)	Phytotoxic	[149]
304		Gulypyrone B	D. gulyae	C. lanatus (T)	Phytotoxic	[149]
173		Nectriapyrone	D. Kongii	C. lanatus (T)	Phytotoxic	[135]
305	Sesquiterpenoids	Diaporol R	Diaporthe sp.	R. stylosa (M)	Cytotoxic	[151]
306		Eremofortin F	Diaporthe sp. SNB-GSS10	Sabicea cinerea (T)	Cytotoxic	[152]
307		Lithocarin B	D. lithocarpus A740	Morinda officinalis (T)	Cytotoxic	[153]
308		Lithocarin C	D. lithocarpus A740	M. officinalis (T)	Cytotoxic	[153]
309	Triterpenoids	19-Nor-lanosta-5(10),6,8,24-tetraene-1α,3β,12β,22S-tetraol	Diaporthe sp. LG23	Mahonia fortunei (T)	Antibacterial	[154]
216	Steriods	3β,5α,9α-Trihydroxy-(22E,24R)-ergosta-7,22-dien-6-one	Diaporthe sp. LG23	M. fortunei (T)	Antibacterial	[154]
310		Chaxine C	Diaporthe sp. LG23	M. fortunei (T)	Antibacterial	[154]
311	Ten-membered lactones	Phomolide C	Diaporthe sp.	Aucuba japonica var. borealis (T)	Inhibitory of proliferation of human colon adenocarcinoma cells	[155]
312		Xylarolide	D. terebinthifolii	Glycyrrhiza glabra (T)	Antimicrobial, Cytotoxic	[156]
313		Phomolide G	D. terebinthifolii	G. glabra (T)	Antibacterial	[156]
314		Xylarolide A	Diaporthe sp.	D. inoxia (T)	Cytotoxic, Antioxidant	[133]
315	Alkaloids	18-Des-hydroxy cytochalasin H	D. phaseolorum-92C	Combretum lanceolatum (T)	Inhibiting leishmanicidal, Antioxidant, Cytotoxic	[157]
316		21-Acetoxycytochalasin J2	Diaporthe sp. GDG-118	Sophora tonkinensis (T)	Antifungal, Antibacterial	[158]
317		21-Acetoxycytochalasin J3	Diaporthe sp. GDG-118	S. tonkinensis (T)	Antifungal, Antibacterial	[158]
318		Cytochalasin J3	Diaporthe sp. GDG-118	S. tonkinensis (T)	Antifungal, Antibacterial	[158]
230		Cytochalasin H	Diaporthe sp. GDG-118 Diaporthe sp. GZU-1021	S. tonkinensis (T) Chiromanteshae matochir (M)	Antifungal, AntibacterialAnti-inflammatory	[158] [126]
319		7-Acetoxycytochalasin H	Diaporthe sp. GDG-118	S. tonkinensis (T)	Antifungal, Antibacterial	[158]
231		Cytochalasin J	Diaporthe sp. GDG-118	S. tonkinensis (T)	Antifungal, Antibacterial	[158]
320		Cytochalasin E	Diaporthe sp. GDG-118	S. tonkinensis (T)	Antifungal, Antibacterial	[158]
321		21-O-Deacetyl-L-696,474	Diaporthe sp. GZU-1021	Chiromanteshae matochir (M)	Anti-inflammatory	[126]
322		Cordysinin A	D. arecae	Kandelia obovate (M)	Anti-angiogenic	[159]
323		5-Deoxybostrycoidin	D. phaseolorum SKS019	A. ilicifolius (M)	Cytotoxic	[160]
241		Fusaristatin A	D. phaseolorum SKS019	A. ilicifolius (M)	Cytotoxic	[160]
324		Vochysiamide B	D. vochysiae LGMF1583	V. divergens (T)	Antibacterial, Cytotoxic	[143]
325		Diaporisoindole A	Diaporthe sp. SYSU-HQ3	E. agallocha (M)	Anti-inflammatory	[148]
326		Diaporisoindole B	Diaporthe sp. SYSU-HQ3	E. agallocha (M)	Anti-inflammatory	[148]
327		Diaporisoindole D	Diaporthe sp. SYSU-HQ3 Diaporthe sp. SYSU-HQ3	E. agallocha (M) E. agallocha (M)	Anti-inflammatory MptpB inhibitory	[148] [147]
328		Diaporisoindole E	Diaporthe sp. SYSU-HQ3	E. agallocha (M)	Anti-inflammatory	[148]
329		Phomopsin F	D. toxica	-b	Cytotoxic	[161]
330	Fatty acids	3-Hydroxypropionic acid	D. phaseolorum	Laguncularia racemose (M)	Antimicrobial	[162]
331		3-Nitropropionic acid	D. gulyae	C. lanatus (T)	Phytotoxic	[149]
332		Diapolic acid A	D. terebinthifolii	G. glabra (T)	Antibacterial	[156]
333		Diapolic acid B	D. terebinthifolii	G. glabra (T)	Antibacterial	[156]
334		Diaporthsin E	Diaporthe sp. JC-J7	Dendrobium nobile (T)	Antihyperlipidemic	[163]
335		3-Hydroxy-5-methoxyhex-5-ene-2,4-dione	Diaporthe sp. ED2	Orthosiphon stamieus (T)	Antifungal	[164]

^a T: terrestrial environment; M: marine environment; ^b The habitat was not mentioned.

). These compounds exhibit various bioactivities, such as cytotoxic, antifungal, antibacterial, antiviral, antioxidant, anti-inflammatory, phytotoxic, antitubercular, antifibrotic, antidiabetic, antimigratory, antiangiogenic, antihyperlipidemic, inhibiting leishmanicidal, activating the NF-κB pathway, enzyme inhibition, inhibitory effects on osteoclastogenesis, antifeedant, contact toxicity, and oviposition deterrent activities. The habitats of the Diaporthe strains were also shown in Table 2, which revealed that there are 73 (accounting for 69%) and 32 (accounting for 30%) compounds isolated from terrestrial and marine environments, respectively, while only one compound (1%) was not mentioned with its habitat.

3.1. Polyketides

There are 67 polyketides reviewed from Diaporthe and they exhibit rich biological activities. Here, we classify these polyketides into the following structural types: xanthones, chromones, chromanones, furanones, pyrones, quinones, phenols, oblongolides, and unclassified polyketides.

3.1.1. Xanthones

Chemical investigation of Diaporthe sp. SCSIO 41011 derived from mangrove plant R. stylosa led to identification of a known compound, 3,8-dihydroxy-6-methyl-9-oxo-9H-xanthene-1-carboxylate (247) (Figure 13). It showed influenza A virus (IAV) inhibition against A/Puerto Rico/8/34 H274Y (H1N1), A/FM-1/1/47 (H1N1), and A/Aichi/2/68 (H3N2) with IC₅₀ values of 9.40, 4.80, and 5.12 μM, respectively [125]. Phomoxanthone A (28) with novel carbon skeleton was isolated from the fungus Diaporthe sp. GZU-1021 derived from a red-clawed crab Chiromanteshaematochir and D. phaseolorum FS431 of deep-sea sediment from the Indian Ocean. This compound showed anti-inflammatory activity by inhibiting nitric oxide (NO) production in RAW 264.7 cells with an IC₅₀ value of 6.1 μM [126], and it displayed good cytotoxicity against MCF-7, HepG-2, and A549 with IC₅₀ values of 2.60, 2.55, and 4.64 μM, respectively [127].

3.1.2. Chromones

Chemical analysis of Diaporthe sp. GZU-1021 associated with Chiromanteshaematochir resulted in the identification of penialidin A (248) and (−)-phomopsichin B (36). They showed inhibitory effects on NO production with IC₅₀ values at 11.9 and 16.5 μM [126]. Six bioactive metabolites were separated from D. phaseolorum SKS019 derived from mangrove plant A. ilicifolius, including four new compounds, (−)-phomopsichin A (249), (+)-phomopsichin B (250), diaporchromanones C (251) and D (252), along with two known compounds, (+)-phomopsichin A (35) and (−)-phomopsichin B (36). These metabolites showed moderate inhibition on osteoclastogenesis by inhibiting RANKL-induced NF-κB activation [128]. Pestalotiopsones F (40) and B (253) were isolated from Diaporthe sp. SCSIO 41011. The two compounds exhibited remarkable anti-IAV activities with IC₅₀ values between 2.52–39.97 μM [125]. Two new benzopyranones, diaportheones A (254) and B (255), were extracted from Diaporthe sp. P133 derived from Pandanus amaryllifolius. They showed moderate antitubercular activities and provided MIC values of 100.9 and 3.5 μM against Mycobacterium tuberculosis H₃₇Rv with Rifampin (MIC = 0.25 μM) as the positive control [130]. The structures of chromones (248–255) are shown in Figure 13.

3.1.3. Chromanones

Two isocoumarins, (10S)-diaporthin (53) and orthosporin (256), were extracted from D. terebinthifolii LGMF907 isolated from Schinus terebinthifolius. They showed antibacterial activities against the methicillin-sensitive Staphylococcus aureus (MSSA) and methicillin-resistant S. aureus (MRSA) [131]. Cytosporone D (54) and mucorisocoumarin A (257) were isolated from the endophytic fungus D. pseudomangiferaea of Tylophora ouata. Compound 257 displayed anti-fibrosis activity with the inhibitory rate of 52.1% on the activation of human lung fibroblasts MRC-5 cells induced by TFG-β at 10 μM. Cytosporone D (54) showed cytotoxicity toward BGC-823 (IC₅₀ = 8.1 μM), antioxidant activity with the inhibition rate of 63.3% by releasing MOA at the concentration of 10 μM, and moderate antidiabetic activity against protein tyrosine phosphatase 1B (PTP1B) [129]. The fungus D. eres derived from pathogen-infected leaf of Hedera helix produced an isocoumarin, 3,4-dihydro-8-hydroxy-3,5-dimethylisocoumarin (258), showing phytotoxic activity in Lemna paucicostata growth [132]. A novel metabolite, diportharine A (259), was obtained from the culture of Diaporthe sp. isolated from Datura inoxia. It showed notable antioxidant activity through DPPH radical scavenging effects (EC₅₀ = 10.3 μM) [133]. The structures of chromanones (256–259) are shown in Figure 13.

3.1.4. Furanones

Furanones are widely used in the field of synthesis, and the synthesized products have important pharmacological activities, such as antiviral, antitumor and antimicrobial [165]. Four bioactive furanones were derived from Diaporthe sp. SXZ-19 of C. acuminate, including the new (1R,2E,4S,5R)-1-[(2R)-5-oxotetrahydrofuran-2-yl]-4,5-dihydroxy-hex-2-en-1-yl(2E)-2-methylbut-2-enoate (260) and three linear furanopolyketides (261–263). These compounds had weak cytotoxicities against HCT 116 cells with the concentration at 10 μM [134]. A new 3-substituted-5-diazenylcyclopentendione, named kongiidiazadione (264), was separated from D. kongii of plant C. lanatus, which was phytotoxic component and showed low antibacterial activity against Bacillus amyloliquefaciens [135]. The structures of furanones (260–264) are shown in Figure 13.

3.1.5. Pyrones

Four secondary metabolites were isolated from D. maritima of healthy Picea mariana and Picea rubens needles collected from the Acadian forest of Eastern Canada, including three dihydropyrones, phomopsolides A (265), B (169), and C (266), and a stable α-pyrone, (S,E)-6-(4-hydroxy-3-oxopent-1-en-1-yl)-2H-pyran-2-one (267). All compounds showed antifungal and antibiotic activities against M. violaceum, Saccharomyces cerevisiae, and B. subtilis [136]. Two known metabolites, 7-hydroxy-6-metoxycoumarin (268) and coumarin (269), were isolated from the endophytic fungus D. lithocarpus obtained from Artocarpus heterophyllus. Compounds 268 showed significant antifungal activity against Sporobolomyces salminocolor with the of 12.2 ± 0.3 mm, and 269 had a diameter inhibition zone of 12.3 ± 0.3 mm against the bacteria B. subtilis [137]. The structures of pyrones (265–269) are shown in Figure 13.

3.1.6. Quinones

Two cyclohexeneoxidedione derivatives, phyllostine acetate (270) and phyllostine (107), showing strong antifeedant activities on Plutella xylostella, were extracted from culture of D. miriciae of plant Cyperus iria. Compounds 270 and 107 had the feeding inhibition of 100% at 50 μg/cm² and the 50% feeding deterrence (DC₅₀) values of 9 and 4.7 μg/cm², displayed contact toxicities with the median lethal concentration (LC₅₀) values of 4.38 and 6.54 μg/larva, and exhibited oviposition deterrent activities with the indexes of 100% and 28.6% at 50 μg/cm², respectively [138]. The new biatriosporin N (271) was isolated from the marine-derived fungus Diaporthe sp. GZU-1021 and displayed anti-inflammatory activity by inhibiting NO production in RAW 264.7 cells with an IC₅₀ value of 11.5 μM [126]. Two anthraquinone derivatives, emodin (272) and 1,2,8-trihydroxyanthraquinone (273), were isolated from an endophytic fungus D. lithocarpus. Emodin (272) exhibited notable cytotoxic activity against murine leukemia P-388 cells (IC₅₀ = 0.41 μg/mL) and antibacterial activity against B. subtilis, M. luteus, Pseudomonas fluorescences, E. coli, and S. cerevisiae with the diameter of inhibition zones of 14.7, 13.2, 13.7, 12.7, and 11.7 mm, respectively. Compound 273 also displayed antibacterial activity against B. subtilis, E. coli, and S. cerevisiae at 14.2, 11.3, and 10.7 mm, respectively [137]. A bis-anthraquinone derivative, named (+)-2,2′-epicytoskyrin A (274), was isolated from Diaporthe sp. GNBP-10 of Uncaria gambir Roxb. It showed antifungal activity against 22 yeast strains and 3 filamentous fungi with MICs between 16–128 μg/mL [139]. Two cytoskyrin type bisanthraquinones, cytoskyrin C (275) and (+)-epicytoskyrin (276), were isolated from Diaporthe sp., an endophytic fungus obtained from Anoectochilus roxburghii. Compounds 275–276 could activate NF-κB pathway and increase the relative activity of luciferase at the concentration of 50 μM, and showed cytotoxicities against SMMC-7721 cells in dose-dependent manner [140]. The structures of quinones (270–276) are shown in Figure 14.

3.1.7. Phenols

The phenolic metabolite, tyrosol (277), was extracted from D. helianthi isolated from Luehea divaricate. Tyrosol showed significant antagonistic activity against the tested pathogenic bacteria (Enterococcus hirae, E. coli, M. luteus, Salmonella typhi, S. aureus, and Xanthomonas asc. Phaseoli) [141]. 2,5-Dihydroxybenzyl alcohol (278) was derived from D. vochysiae LGMF1583 of medicinal plant Vochysia divergens, which showed cytotoxic activity against A549 (EC₅₀ = 54.8 μM) and PC3 (EC₅₀ = 9.45 μM) [143]. Four phytotoxic compounds, 4-hydroxybenzaldehyde (140), p-cresol (279), 4-hydroxybenzoic acid (280), and tyrosol (277), were isolated from D. eres of grapevine (V. vinifera) wood. In the leaf disk and leaf absorption bioassay, phytotoxicities of all compounds increased with the concentration ranging in 0.1–1 mg/mL [142]. Arbutin (281), obtained from an endophytic fungus D. lithocarpus, had moderate cytotoxicity against murine leukemia P-388 cells and gave an IC₅₀ value at 2.91 μg/mL [137]. Two antibacterial metabolites, phomosines A (113) and C (115), were extracted from Diaporthe sp. F2934 of plant Siparuna gesnerioides. They were active against S. aureus, M. luteus, Streptococcus oralis, Enterococcus fecalis, Enterococcus cloacae, and Bordetella bronchiseptica with inhibition zone diameter from 6 ± 0.62 to 12 ± 1.18 mm at the concentration of 4 μg/μL [144]. Flavomannin-6,6ʹ-di-O-methyl ether (282) was extracted from an endophytic strain of D. melonis from Annona squamosal, which showed antimicrobial activity against S. aureus 25697, S. aureus 29213, and Streptococcus pneumoniae ATCC 49619 with MIC values of 32, 32, and 2 μg/mL, respectively [145]. Four secondary metabolites, acetoxydothiorelone B (283), and dothiorelones B (284), L (285) and G (286), were isolated from D. pseudomangiferaea. All of them displayed antifibrotic activities with the inhibitory rates of 17.4, 62.9, 59.2 and 41.1% on the activation of human lung fibroblasts MRC-5 cells induced by TFG-β at 10 μM, with pirfenidone (53.2%) as positive control at 1 mM [129]. Two diphenyl ether derivatives, diaporthols A (287) and B (288), were extracted from Diaporthe sp. ECN-137 isolated from the leaves of Phellodendron amurense. Compounds 287–288 exhibited anti-migration effects on TGF-β1-elicited MDA-MB-231 breast cancer cells with an concentration at 20 μM [146]. Tenellone C (289) was obtained from Diaporthe sp. SYSU-HQ3 of mangrove plant E. agallocha, displaying inhibitory effect on M. tuberculosis protein tyrosine phosphatase B (MptpB) (IC₅₀ = 5.2 μM) [147]. Six compounds were isolated from endophytic fungus Diaporthe sp. SYSU-HQ3 derived from the branches of E. agallocha, including a new benzophenone derivative, tenellone D (290), four special 2,3-dihydro-1H-indene isomers, diaporindenes A-D (291–294), and isoprenylisobenzofuran A (75). All isolated compounds showed anti-inflammatory activities by LPS-Induced NO production in RAW 264.7 cells with IC₅₀ values of 4.2–18.6 μM [148]. The structures of phenols (277–294) are shown in Figure 15.

3.1.8. Oblongolides

Four lovastatin analogues, oblongolides D (295), H (296), P (297) and V (298), were obtained from the endophytic fungus Diaporthe sp. SXZ-19. These metabolites showed weak cytotoxic activities against HCT 116 cells with the concentration of 10 μM [134]. The structures of oblongolides (295–298) are shown in Figure 16.

3.1.9. Unclassified Polyketides

Phomentrioloxin B (299) was obtained from a strain of D. gulyae isolated from C. lanatus, which had low phytotoxic effect to cause small necrosis against several weedy and crop plant species [149]. The fungus Diaporthe sp. SCSIO 41011 derived from mangrove plant R. stylosa, afforded two metabolites, epi-isochromophilone II (300) and isochromophilone D (301). Compound 300 displayed cytotoxicities against ACHN, OS-RC-2, and 786-O cells with IC₅₀ values between 3.0 and 4.4 μM, and 301 had an IC₅₀ of 8.9 μM against 786-O cancer cells [150]. The structures of unclassified polyketides (299–301) are shown in Figure 16.

3.2. Terpenoids

(1R,2R,4R)-Trihydroxy-p-menthane (302) was isolated from Diaporthe sp. SXZ-19, and displayed weak cytotoxicity on HCT 116 cells [134]. Two new α-pyrones, gulypyrones A (303) and B (304), were extracted from D. gulyae. Both of them showed phytotoxic activities and gulypyrone A caused necrosis against Helianthus annuus plantlets [149]. A pentaketide monoterpenoid, nectriapyrone (173), was isolated from culture of D. Kongii, showing phytotoxic activity [135]. A new brasilane-type sesquiterpenoid, diaporol R (305) was produced by an endophytic fungus Diaporthe sp. isolated from leaves of R. stylosa. Diaporol R had moderate cytotoxic effect on SW480 cancer cells and provided an IC₅₀ value at 8.72 ± 1.32 μΜ [151]. Eremofortin F (306) was obtained from endophytic fungus Diaporthe sp. SNB-GSS10 of Sabicea cinerea. It showed cytotoxic activity against KB and MRC5 cells with IC₅₀ values of 13.9 and 12.2 μM [152]. Two new eremophilanes, lithocarins B (307) and C (308), were extracted from D. lithocarpus A740, an endophytic fungus isolated from Morinda officinalis. These compounds displayed low cytotoxicities against SF-268, MCF-7, HepG-2, and A549 tumor cells with IC₅₀ values between 37.68–97.71 μM [153]. The new triterpenoid, 19-nor-lanosta-5(10),6,8,24-tetraene- 1α,3β,12β,22S-tetraol (309), was obtained from Diaporthe sp. LG23 of the Chinese medicinal plant Mahonia fortunei, and displayed antibacterial activity against both Gram-positive and Gram-negative bacteria [154]. The structures of terpenoids (302–309) are shown in Figure 17.

3.3. Steriods

Only two steroids, 3β,5α,9α-trihydroxy-(22E,24R)-ergosta-7,22-dien-6-one (216) and chaxine C (310) (Figure 17), were isolated from Diaporthe sp. LG23, showing antibacterial activities against B. subtilis with streptomycin as a positive control [154].

3.4. Ten-Membered Lactones

Ten-membered lactones always have anti-tumor, anti-inflammatory, anti-viral, anti-bacterial and other pharmacological activities, exhibiting important medical value in clinical practice [166]. Phomolide C (311) from Diaporthe sp. of Aucuba japonica var. borealis, inhibited the proliferation of human colon adenocarcinoma cells with concentration of 50 μg/mL [155]. The endophytic fungus D. terebinthifolii GG3F6 derived from medicinal plant Glycyrrhiza glabra, afforded two known compounds, xylarolide (312) and phomolide G (313). Compound 312 had cytotoxicity in vitro against cancer cells MIAPaCa-2, HCT-116 and T47D cancer cells with IC₅₀ values of 38, 100, and 7 μM and showed notable antimicrobial activity against C. albicans and Yersinia enterocolitica with IC₅₀ values at 78.8 and 72.1 μM. Moreover, Compound 313 showed an IC₅₀ value of 69.2 μM against Y. enterocolitica [156]. A novel metabolite, named xylarolide A (314), was isolated from the fungus Diaporthe sp. of D. inoxia. Compound 314 had remarkable cytotoxicities against MIAPaCa-2 and PC-3 cancer cells with IC₅₀ values between 14–32 μM, and also showed antioxidant activity on DPPH radical scavenging effect (EC₅₀ = 10.3 μM) [133]. The structures of four ten-membered lactones (311–314) are shown in Figure 17.

3.5. Alkaloids

18-Des-hydroxy cytochalasin H (315) was obtained from endophytic fungus D. phaseolorum-92C of Combretum lanceolatum. This compound inhibited leishmanicidal activity, displayed moderate antioxidant activity, and had cytotoxic activity against the breast cancer cells MDA-MB-231 and MCF-7 [157]. A series of the cytochalasins were extracted from Diaporthe sp. GDG-118 of Sophora tonkinensis, including 21-acetoxycytochalasins J₂ (316) and J₃ (317), 7-acetoxycytochalasin H (319), and cytochalasins J₃ (318), H (230), J (231), and E (320). All isolated metabolites showed different degrees of antifungal activities against Alternaria oleracea, Pestalotiopsis theae, Colletotrichum capsici, and Ceratocystis paradoxa with MIC values of 1.56–100 μg/mL, and antibacterial activities against Gram-positive bacteria (B. subtilis, B. megaterium and Bacillus anthraci) and Gram-negative bacteria (Proteus vuigaris, E. coli and Salmonella paratyphi B) with MIC values in the range of 12.5–100 μg/mL [158]. The fungus Diaporthe sp. GZU-1021 yielded cytochalasin H (230) and 21-O-deacetyl-L-696,474 (321), which showed anti-inflammatory activities by inhibiting NO production in RAW 264.7 cells with IC₅₀ values of 1.94 and 7.35 μM [126]. Cordysinin A (322) was derived from endophytic fungus D. arecae of Kandelia obovate. It showed anti-angiogenic activity against the human endothelial progenitor cells (EPCs) with IC₅₀ value of 15.1 ± 0.2 μg/mL [159]. Further research led to the identification of 5-deoxybostrycoidin (323) and fusaristatin A (241) from D. phaseolorum SKS019 of mangrove plant A. ilicifolius. Compound 323 showed cytotoxic activity against MDA-MB-435 and NCI-H460 with IC₅₀ values at 5.32 and 6.57 μM, and the IC₅₀ value of 241 was 8.15 μM on MDA-MB-435 [160]. A new carboxamide, vochysiamide B (324), was extracted from new species D. vochysiae LGMF1583, which displayed antibacterial activity on the Gram-negative bacterium Klebsiella pneumoniae (KPC) with MIC value at 80 μg/mL and showed cytotoxic activity against A549 (EC₅₀ = 86.4 μM) and PC3 (EC₅₀ = 40.25 μM) [143]. Four compounds, diaporisoindoles A (325), B (326), D (327), and E (328), were obtained from an endophytic fungus Diaporthe sp. SYSU-HQ3. They all showed anti-inflammatory activities by reducing NO production with IC₅₀ values of 22.7, 18.2, 8.9, and 8.3 μM, respectively [148]. Diaporisoindole D (327) also exhibited inhibitory activity towards M. tuberculosis protein tyrosine phosphatase B (MptpB) (IC₅₀ = 4.2 μM) [147]. Phomopsin F (329) was isolated from D. toxica, and showed cytotoxic activity against HepG2 cells [161]. The structures of alkaloids (315–329) are shown in Figure 18.

3.6. Fatty Acids

Fatty acids are simple linear compounds that play an important role in the synthesis and catabolism of organisms [167]. Over here, six fatty acids are reported from Diaporthe. The fungus D. phaseolorum derived from Laguncularia racemose, afforded 3-hydroxypropionic acid (330), which showed antimicrobial activity against S. aureus and S. typhi [162]. A phytotoxic metabolite, 3-nitropropionic acid (331), was isolated from D. gulyae. Compound 331 was notably active in causing necroses on several weedy and crop plant species [149]. Two new fatty acids, diapolic acids A and B (332 and 333), were isolated from endophytic fungus D. terebinthifolii. They had moderate antibacterial activities against Y. enterocolitica with IC₅₀ values of 78.4 and 73.4 μM [156]. Studies of the strain Diaporthe sp. JC-J7 from stems of Dendrobium nobile led to the isolation of a new compound, diaporthsin E (334). It showed low antihyperlipidemic activity on triglycerides (TG) in steatotic L-02 cells with the inhibition rate of 26% at the concentration of 5 μg/mL [163]. The novel anti-candidal metabolite, 3-hydroxy-5-methoxyhex-5-ene-2,4-dione (335), was derived from Diaporthe sp. ED2 of medicinal herb Orthosiphon stamieus Benth. It showed antifungal activity against C. albicans with MIC value of 3.1 μg/mL [164]. The structures of fatty acids (330–335) are shown in Figure 19.

4. Characteristics of Bioactive Secondary Metabolites from the Genus Diaporthe and Anamorph Phomopsis

In this paper, a total of 335 bioactive compounds from the genus Diaporthe and Phomopsis are summarized. There are 106 secondary metabolites from Diaporthe and 246 ones from Phomopsis, in which 17 compounds were obtained from both of Diaporthe and Phomopsis. These compounds are classified into polyketides, terpenoids, steroids, macrolides, ten-membered lactones, alkaloids, flavonoids, and fatty acids. As seen in Figure 20, about two thirds of all compounds reported from Diaporthe and Phomopsis are refered to polyketides, accounting for 63% and 70%, respectively. Moreover, terpenoids (8%, 15%), alkaloids (17%, 6%), and steroids (2%, 4%) were also produced by both of Diaporthe and Phomopsis. It is worth noting that fatty acids (6%) and ten-membered lactones (4%) are only reported from Diaporthe, while flavonoids (2%) and macrolides (3%) are only found in Phomopsis. Polyketides, as the largest member of the metabolites, are widely used in the field of medicine and play an important role in the treatment of cancer diseases.

The various bioactivities of the compounds isolated from Diaporthe and Phomopsis are presented in Figure 21, mainly containing cytotoxic, antibacterial, antifungal, antiviral, anti-inflammatory, antioxidant, antialgae, enzyme inhibition, and phytotoxic activities. Most of compounds have at least one kind of bioactivities. As seen in Figure 21 and Table 1 and Table 2, secondary metabolites of Diaporthe and Phomopsis mainly exhibit cytotoxic, antibacterial and antifungal activities, accounting for 73% of all compounds, with 56 in Diaporthe and 200 from Phomopsis. Interestingly, in recent years, more and more compounds with anti-inflammatory, antioxidant and enzyme inhibitory activities have been studied in important human diseases.

5. Conclusions

This review presents the diverse chemical structures and bioactivities of 335 compounds isolated from 26 known species and various unidentified species of the genus Diaporthe and its anamorph Phomopsis between 2010–2019. Here, we can see from Table 1 and Table 2, among all of the reported compounds, there are 236 (accounting for about 70%) and 92 (about 27%) compounds derived only from terrestrial and marine environments (including mangroves, sediments, deep-sea fungi and marine animals), respectively. In addition, only one compound is obtained from both of terrestrial and marine environments. In contrast, six compounds are not mentioned with their habitats in the literature. Polyketides represent the main chemical population, accounting for 64%. About 73% of all metabolites possess cytotoxic, antibacterial, and antifungal activities. The species named as Phomopsis significantly produce much more compounds than Diaporthe, and most strains have not yet been identified at the species level. In conclusion, these results illustrate that the metabolic resources of Diaporthe and Phomopsis are of great value and deserved to conduct further research. Interestingly, in the past three years, there have been more reports on the secondary metabolites of the fungi in Diaporthe and Phomopsis than before, displaying an increasing trend, which indicates that Diaporthe and Phomopsis are regarded as important sources for discovering new natural bioactive substances.

In the past many years, lots of interesting fungal bioactive metabolites had been widely developed into new drugs, like antibiotics. Although most compounds obtained from Diaporthe and Phomopsis fungi had been studied on their isolation, structures, and activities, the in-depth research on pharmacological mechanisms and development of potent active compounds in drugs are still less. According to current studies, some compounds with remarkable bioactivities may serve as potential drug candidates in the future, such as cytotoxic altersolanol A and PM181110, and antimicrobial dicerandrol A. In order to ascertain the therapeutic potential of these compounds, further studies of pharmacological and producing mechanisms are required.

The fungal species in Diaporthe and Phomopsis have been considered to be important sources that can produce diverse and novel bioactive metabolites, which has attracted many natural product chemists and pharmacologists to study in recent years. The metabolites produced by Diaporthe and Phomopsis have rich biological activities, which is enough to show the importance of its metabolic resources. Nowadays, many fungi produce interesting bioactive metabolites that have been studied for their biosynthesis pathway, while similar studies in Diaporthe and Phomopsis are performed relatively less often. In the following work, the microbial biosynthesis pathway might be considered for further developing valuable products from Diaporthe or Phomopsis, which are hoped to be used as drug molecules for disease treatment. However, it cannot be ignored that Diaporthe or Phomopsis are important plant pathogens which might cause a wide range of plant host diseases and even serious human pathogens. In the future work, we should also focus on the role of metabolites produced by these pathogens, as well as the relationships with their hosts.