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Biocontrol potential of endophytic fungi originated from grapevine leaves for management of anthracnose disease caused by Colletotrichum gloeosporioides

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Abstract

In the present study, 51 fungal endophytes (FEs) were isolated, purified and identified from the healthy leaf segments of ten grapevine varieties based on the spore and colony morphologies and ITS sequence information. The FEs belonged to the Ascomycota division comprising eight genera viz., Alternaria, Aspergillus, Bipolaris, Curvularia, Daldinia, Exserohilum, Fusarium and Nigrospora. The in vitro direct confrontation assay against Colletotrichum gloeosporioides revealed that six isolates viz., VR8 (70%), SB2 (83.15%), CS2 (88.42%), MN3 (88.42%), MS5 (78.94%) and MS15 (78.94%) inhibited the mycelial growth of test pathogen. The remaining 45 fungal isolates showed 20–59.9% growth inhibition of C. gloeosporioides. Indirect confrontation assay manifested that the isolates MN1 and MN4a showed 79.09% and 78.18% growth inhibition of C. gloeosporioides followed by MM4 (73.63%) and S5 (71.81%) isolates. Isolate S5 and MM4 were found to produce azulene and 1,3-Cyclopentanedione, 4,4-dimethyl as antimicrobial volatile organic compounds, respectively. The 38 FEs showed PCR amplification using internal transcribed spacer universal primers. The BLAST search revealed highest similarity with the existing sequences in the database. The phylogenetic analysis revealed the occurrence of seven distinct clusters each corresponding to single genus.

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Data availability

All the sequence data is available online and in the public domain (https://www.ncbi.nlm.nih.gov/).

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Acknowledgements

All the authors highly acknowledge the support provided by the Director, ICAR-National Research Centre, Pune to carry out the proposed research work.

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Contributions

SKH: conceived idea and formulated the experiments, constructed phylogenetic tree, drafted and reviewed the manuscript, PSG: isolated, characterized, and evaluated the fungal endophytes in vitro, prepared figures and tables, analyzed sequence information VCB: purified and partially characterized the isolates, TL: generated ITS sequence information and reviewed the manuscript, SAS: maintained the pure culture isolates and isolated the genomic DNA of fungal endophytes, HM: formatting, statistical analysis, ASTP: identified VOCs from fungal endophytes and reviewed manuscript, SS: critically reviewed the manuscript.

Corresponding author

Correspondence to Somnath K. Holkar.

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All the authors declare that they have no conflict of interest in the publication.

Supplementary Information

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13205_2023_3675_MOESM1_ESM.docx

Supplementary file1 (DOCX 7686 KB) Microscopic observation of fungal endophytes isolated from leaf samples of ten grapevine genotypes cultivated at experimental fields of ICAR-National Research Centre for Grapes, Pune. All fungal endophyte species were observed under compound microscope at 100x resolution (Leica DM 750) stained with cotton blue. Shape of conidia and type of conidiophores were observed and recorded. CS: Cabernet Sauvignon, C: Crimson Seedless, MM: Manjari Medika, MN: Manjari Naveen, MS: Manjari Shyama, RG: Red Globe, SB: Sauvignon Blanc, S: Shiraz, T: Thompson Seedless, VR: Vitis rotundifolia

Supplementary file2 (DOCX 46 KB)

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Holkar, S.K., Ghotgalkar, P.S., Lodha, T.D. et al. Biocontrol potential of endophytic fungi originated from grapevine leaves for management of anthracnose disease caused by Colletotrichum gloeosporioides. 3 Biotech 13, 258 (2023). https://doi.org/10.1007/s13205-023-03675-z

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  • DOI: https://doi.org/10.1007/s13205-023-03675-z

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