Indian J Microbiol (Apr–June 2014) 54(2):123–128
DOI 10.1007/s12088-013-0442-8
REVIEW ARTICLE
Advances in Taxonomy of Genus Phoma: Polyphyletic Nature
and Role of Phenotypic Traits and Molecular Systematics
Mahendra Kumar Rai • Vaibhav V. Tiwari
László Irinyi • György János Kövics
•
Received: 7 July 2013 / Accepted: 24 November 2013 / Published online: 4 December 2013
Ó Association of Microbiologists of India 2013
Abstract Phoma is a highly polyphyletic genus with its
unclear species boundaries. The conventional system of
identification is functional but it has its limitations. Besides
morphological studies, chemotaxonomy, secondary metabolite and protein profiling have been assessed for the classification and identification of these fungi. Molecular
datasets have provided a better outlook towards the phylogenetic and evolutionary trends of Phoma. Molecular
markers such as ITS-rDNA, tubulin, actin, translation
elongation factor have been widely used by the taxonomists
to demarcate species. However, outcomes gained up till now
represent preliminary step towards the study of Phoma
systematics and a combined approach would be beneficial in
the understanding of this polyphyletic group members.
Lately, on the base of molecular phylogeny of the type
species of the seven Phoma sections a new teleomorph
family, Didymellaceae has been established, besides the
Phaeosphaeriaceae related to sect. Paraphoma anamorphs,
and the Leptosphaeriaceae to sect. Heterospora anamorphs.
The estimated ratio is about 70 % of the recognized Phomalike species can be associated with the Didymellaceae
ascomycetous family.
Keywords Phoma Systematics Didymellaceae
ITS-rDNA Translation elongation factor tef1
sequences b-tubulin
Introduction
Phoma species are geographically prevalent and are found in
diverse ecological niches. In spite of having numerous
harmless saprobic species, Phoma species have been well
known as imperative plant pathogen on economically
important plants [1, 2]. The identification of isolates based
on morphological characters is often conceded beneath
extreme time restraints. However, generation of vast morphological and anatomical data over the years had built up a
strong base for the taxonomic studies of Phoma. But, this
often lacked satisfactory resolution and thus should always
be compared with the conclusions from molecular data
sources. Moreover, there have been efforts to classify fungi
based on secondary metabolite profiles [3]. Chemotaxonomy
is the use of chemical diversity as a taxonomic tool which
means classification and identification of filamentous fungi
based on profiles of secondary metabolites.
The major objective of any taxonomic study includes
systematic grouping of taxa of interest through generation
of robust natural classification based on constant characteristics which reveal their factual evolutionary record and
development of trustworthy identification key(s) for
uncomplicated taxon determination. Molecular taxonomic
methods are the most widely accepted tools for identification of the appropriate taxonomic level at which it would
be most informative and its correlation with morphologically definable taxonomic groupings.
M. K. Rai V. V. Tiwari
Department of Biotechnology, S. G. B. Amravati University,
Amravati 444 602, Maharashtra, India
Identification on the Basis of Phenotypic Characteristics
L. Irinyi G. J. Kövics (&)
Plant Protection Institute, Debrecen University, P.O. Box 36,
Debrecen 4015, Hungary
e-mail: kovics@agr.unideb.hu
Phoma is taxonomically a controversial genus. It consists
of over 200 known species, found all over the world. The
original genus concept of Saccardo [4] was emended by
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Boerema and Bollen [5] and after more than 40 years of
taxonomical research, the admitted Phoma species were
arranged in nine sections [6, 7], which are mainly based on
a single or just a few morphological characters and have
not been confirmed as biologically realistic by molecular
biological studies [2, 8].
Recently there is a convention of using a single generic
name, based on priority but regardless of whether the genus is
‘‘anamorphic’’ or ‘‘teleomorphic’’. This classification is used
for all unambiguous monophyletic phylogenetic lineages [2].
The nine Phoma sections have teleomorph relations
described in the genera Didymella, Mycosphaerella, Leptosphaeria and Pleospora [6] indicating that Phoma anamorphs represent a polyphyletic group. For a long time the
genera Phoma and Ascochyta, both classified in the Pleosporales of Ascomycota, have already been considered as closely
related [9]. The species of genus Phoma fungi reproduce
asexually and a typical colony of the genus has a velvety
texture which can be slightly powdery, depending on the
species. It may be white to gray with pink, yellow, and reddish
purple colourations. Pycnidia contain single celled masses of
spores which are known as pycn(idi)ospores or conidia. With
the effect of different factors like pH, temperature, light, etc.
the culture characteristics and morphology differs [10–12].
They are also known to produce variety of secondary
metabolites in the form of dyes, antibiotics, etc. [13–29].
Phoma species are ubiquitous and are common
inhabitants of soil [1, 30–35] and they may periodically
infect plants by causing root infections and different spot/
blotch diseases [36–41]. Moreover, Phoma species have
also been reported as opportunistic invasive pathogen in
humans [42–48].
A variety of significant agronomic crops are susceptible
to the wide-ranging species of the genus Phoma [49–52].
Until the late seventies, majority of the Indian species of
Phoma were erected on the basis of host alone [53–64], and
thus the importance of host specificity for the taxonomy of
Phoma has been much emphasized and overestimated. Up to
eighties many mycologist in India did not consider morphological characters for identification and differentiation of
Phoma species in culture. Usually, a morphological species
may attack various host plants. For example, P. exigua was
reported on different hosts [65]. The criterion of identification should be in such a way so that it should be possible to
identify a Phoma species in case host identification is difficult particularly when floral parts are lacking, or when the
fungus is grown on artificial media. These have created
taxonomic dilemmas and misinterpretations with superfluous species descriptions.
The growth and colour of the colony helps in differentiating the species in the genus Phoma [66]. On the basis of
cultural and morphological characteristics of Phoma was
assembled in 20 broad groups [38, 67–73]. Furthermore,
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there were studied effects of different factors such as different colours of light, temperature and different media on
the morphology and cultural characteristics of different
Phoma species [10, 14, 36, 74, 75].
Previously the erection of new species of Phoma was
mostly based on host and sometimes on shape and size of
pycnidia and pycnospores. The key to identification of
Phoma was summarized by Boerema et al. [7] on the basis
of their morphological appearances. This key is enormously helpful in identifying strains up to species level but
it has its limitations as several taxa exhibit characters that
are representative of different sections [76].
The erection of Phoma species on the basis of traditional
methods particularly on host was a criterion which dominated up to early seventies. Later, mycologists realized the
importance of morphological characters for creating a new
Phoma species. The most important morphological
characteristics include the formation of pycnidia, conidia
and chlamydospores. Although, size and septation of the
conidia are also important criteria for species identification,
at times the conidium dimensions may differ in the strains
of the same species.
As numbers of fungi grow on wide range of culture
media, fungal taxonomists use these physiological and
biochemical tools for the identification and classification
purpose [53]. Growth rates on distinct media can also be
exploited for the differential studies of filamentous fungi.
As Phoma species are morphologically similar and
hence discrimination of the species based on the production
of secondary metabolites, cultural characteristics, mostly
depends on the growth conditions, which are not reliable.
Thus, it can be conferred that phenotypic characters cannot
always be distinctive between taxa and the aid of molecular
systematics will rather helpful in delineating the unclear
species boundaries of this controversial genus.
Determining the Identity of Phoma by Multiple
Approach
Secondary metabolite profiling has also been assessed as
one of the marker for differentiation among filamentous
fungi including Phoma-like species [3, 77]. Secondary
metabolites are usually a mixture of closely related molecules with a peculiar and exceptional chemical structure
such as steroids, terpenes, alkaloids, cyclopeptides, and
coumarins. Some of these are mycotoxins. With the advent
of modern chromatographic techniques the profiling is easy
fast and reliable which has resulted in a vast array of
secondary metabolite data. Conversely, this method has a
drawback as the production of these secondary metabolites
can be affected by different factors such as environmental
conditions, temperature and pH [53].
Indian J Microbiol (Apr–June 2014) 54(2):123–128
Isozyme comparative studies were made to delineate of aesterase isozyme profiles of some Phoma species and varieties
[78]. Simple band-counting technique is used for differentiation, although phylogenetic information can be retrieved from
allelic frequencies and other genetic interpretation data. Furthermore, this analysis can be used to identify unknown species or to identify a pathogen in a mixed infection.
Identification Based on Molecular Datasets
Recently, the use of molecular datasets in phylogenetic
assessment has gained much popularity among the
mycologists. Molecular data such as RAPD, RFLP analyses and the use of DNA sequences are very commonly used
by mycologists [79]. ITS-rDNA sequences are divergent
and vary between species within a genus hence it is the
most popular choice in molecular systematics.
Generic Regions Responsible for Identification
of Phoma sp.
The molecular based phylogenetic analyses within Phoma
genus have only been used for defining phylogenetic
relationships among isolates within one or closely related
species, however recently serial publications came out with
re-classification consequences of Phoma-like fungi on the
base of molecular data [1, 2, 8, 9, 49, 76, 80–82].
Molecular taxonomy is an essential part for authentication of established species concept, identification and
taxonomic revision of well-established species based on
phenotypic and ecological characters and also desired for
the detection of cryptic species (species where no morphological differences exist) [83–85]. With the advent of
PCR wide range of molecular markers viz. nuclear ribosomal markers (ITS-rDNA), protein coding genes (tubulin
genes, translation elongation factor, actin, histone gene,
etc.) have been expedited by fungal taxonomists for the
study of both phylogenetic and population structure studies
[86]. Some of these markers which are used predominantly
have been discussed briefly below.
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transcript contains the 50 -external transcribed sequence (50 ETS), 18S rRNA, ITS1, 5.8S rRNA, ITS2, 26S rRNA and
finally the 30 -ETS. During rRNA maturation, ETS and ITS
pieces are excised and as non-functional maturation byproducts rapidly degraded. Genes encoding ribosomal RNA
and spacers occur in tandem repeats that are thousands of
copies long, each separated by regions of non-transcribed
DNA termed intergenic spacer (IGS) or non-transcribed
spacer (NTS) [86]. Sequence comparison of the ITS region
is widely used in taxonomy and molecular phylogeny.
Tubulin Gene
Tubulin is one of the members of globular heterodimeric
proteins. The most common classes are alpha (a) and beta
(b) tubulin having molecular weight of about 55 kDa [87–
90]. These proteins are responsible for the production of
microtubules. b-tubulin is encoded by highly conserved
multigene families or in some cases single genes. On the
basis of tubulin genes wide range of organisms are erected
and characterized leading to the successful determination
of inter- and intraspecific relationships [49, 80, 91].
Translation Elongation Factors (tef) Gene
Elongation factors are set of proteins used in protein synthesis. They facilitate translational elongation starting from
the first to the last peptide bond in ribosome. The translation elongation factor 1 alpha gene (tef1) has been widely
used for the phylogenetic and taxonomic evaluation study
of Phoma [80]. Single-copy genes have the benefit that any
sequence variation within a spore can be recognized
explicitly to disparity among nuclei.
Actin Gene
The actin gene encodes actin, a multifunctional protein
found in all eukaryotic cells and is one of the highly conserved proteins. These genes have been used to study
evolutionary relationships among Phoma species [92].
Moreover, these genes assist in exploring the additional
information about genetic structure in these fungi.
Nuclear rDNA Sequences
Histone Protein Gene
Bi-parental, nuclear ITS regions are one of the most popular
choices for phylogenetic inference for genus level or below
due to higher rate of base substitution than most of the
organellar genes [2, 49, 79, 80]. Hence, it has typically been
most useful for molecular systematics at the species level,
and even within species to identify geographic races.
ITS, refers to a piece of non-functional RNA situated
between structural ribosomal RNAs (rRNA) on a common
precursor transcript. This polycistronic rRNA precursor
Eukaryotic genomic DNA is wrapped with histone proteins
in nucleosomes the fundamental units of chromatin [93–95].
The nucleosome comprises of the DNA enfolded around an
octamer of core histones consisting of two copies each of
histones H2A, H2B, H3, and H4 assembled in one H3–H4
heterotetramer and two H2A–H2B heterodimers [96]. Histone protein gene helps in the comparative studies of intron
insertion sites among the different organisms.
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DNA Barcoding
With the advancement in sequencing and computational
methodologies DNA sequences have become a major
source of information for evolutionary and genetic relationships. Comparative sequence analysis has emerged in
almost all fields of biological sciences. A short standardized sequence that can distinguish the individual from the
species forms the basis of DNA barcoding [97]. Barcoding
is usually carried out by the retrieval of a DNA sequence
i.e. a barcode from a specific gene region. This unknown
barcode is then compared with the other barcodes present
in the library of reference barcode sequences.
The most preferred DNA barcode region for fungi is ITS
but it not enough to delineate all the taxa [98, 99]. However, according to Aveskamp et al. [81] actin gene can also
be considered for developing DNA barcodes for Phoma
species.
Conclusions
Phoma with its unclear species boundaries still remains a
taxonomically controversial genus. A vast array of morphological as well as molecular data have been generated still
there are many questions that has to be addressed with
numerous species yet to be discovered. Though the traditional
method of identification lacks the specificity it still cannot be
outlined in the presence of modern techniques of molecular
systematics. Morphological studies still forms the basis of the
preliminary level identification and thus is applicable and aid
to morphological species recognition. Nevertheless, it can be
concluded that a multiple approach, including molecular
tools, would provide a better understanding for the constant
and reliable identification of Phoma species. Lately, towards
a reclassification of the Phoma complex, on the data of
molecular phylogeny, a new ascomycetous teleomorph family, Didymellaceae has been established, besides to the Phaeosphaeriaceae and Leptosphaeriaceae [9]. Based on the
sequence data, it is estimated that approximately 70 % of the
species recognised by Boerema et al. [7] can be associated
with the Didymellaceae [2].
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