Abstract
Mountain biodiversity is under unparalleled pressure due to climate change, necessitating in-depth research on high-altitude plant’s microbial associations which are crucial for plant survival under stress conditions. Realizing that high-altitude tree line species of Himalaya are completely unexplored with respect to the microbial association, the present study aimed to elucidate plant growth promoting and secondary metabolite producing potential of culturable endophytic fungi of Himalayan silver birch (Betula utilis D. Don). ITS region sequencing revealed that the fungal isolates belong to Penicillium species, Pezicula radicicola, and Paraconiothyrium archidendri. These endophytes were psychrotolerant in nature with the potential to produce extracellular lytic activities. The endophytes showed plant growth promoting (PGP) traits like phosphorus solubilization and production of siderophore, indole acetic acid (IAA), and ACC deaminase. The fungal extracts also exhibited antagonistic potential against bacterial pathogens. Furthermore, the fungal extracts were found to be a potential source of bioactive compounds including the host-specific compound—betulin. Inoculation with fungal suspension improved seed germination and biomass of soybean and maize crops under net house conditions. In vitro PGP traits of the endophytes, supported by net house experiments, indicated that fungal association may support the growth and survival of the host in extreme cold conditions.
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Data availability
The accession numbers MZ613188.1, MN327637.1, MN327638.1, and MN327639.1 correspond to isolates GBPI beF1, GBPI beF2, GBPI beF4, GBPI beF5 respectively and the sequencing data is accessible on NCBI.
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Acknowledgements
Director, G. B. Pant National Institute of Himalayan Environment, India, is acknowledged for providing the facilities. Advance Instrumentation Research Facility (AIRF)- Jawaharlal Nehru University (JNU), India, is acknowledged for extending the GC/MS facilities. Sequencing was performed at Centre for Excellence, National Centre for Microbial Resource, NCCS, Pune.
Funding
The work was supported by the National Mission on Himalayan Studies (NMHS Reference No.: GBPNI/NMHS- 2018/NSMW/SG29).
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KD: conceptualization, methodology, experimentation, analysis, writing; AP: conceptualization, investigation, supervision, validation, review, editing; AS: molecular identification and phylogeny; MS: review; SSS: plant identification and sample collection; MS: review; MS: supervision, review, editing.
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Dasila, K., Pandey, A., Sharma, A. et al. Endophytic fungi from Himalayan silver birch as potential source of plant growth enhancement and secondary metabolite production. Braz J Microbiol 55, 557–570 (2024). https://doi.org/10.1007/s42770-024-01259-4
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DOI: https://doi.org/10.1007/s42770-024-01259-4