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Multifarious plant growth-promoting traits of mangrove yeasts: growth enhancement in mangrove seedlings (Rhizophora mucronata) for conservation

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Abstract

Plant Growth-Promoting Yeasts (PGPY) have garnered significant attention in recent years; however, research on PGPY from mangroves remains a largely unexplored frontier. This study, therefore, focused on exploring the multifaceted plant growth-promoting (PGP) capabilities of yeasts isolated from mangroves of Puthuvype and Kumbalam. The present work found that manglicolous yeasts exhibited diverse hydrolytic properties, with the predominance of lipolytic activity, in addition to other traits such as phosphate solubilization, and production of indole acetic acid, siderophore, ammonia, catalase, nitrate, and hydrogen cyanide. After screening for 15 PGP traits, three strains P 9, PV 23, and KV 35 were selected as the most potent ones. These strains also exhibited antagonistic activity against fungal phytopathogens and demonstrated resilience to abiotic stresses, making them not only promising biocontrol agents but also suited for field application. The potent strains P 9, PV 23, and KV 35 were molecularly identified as Candida tropicalis, Debaryomyces hansenii, and Aureobasidium melanogenum, respectively. The potential of these strains in enhancing the growth performance of mangrove seedlings of Rhizophora mucronata, was demonstrated using the pot-experiment. The results suggested that the consortium of three potent strains (P 9, PV 23, and KV 35) was more effective in increasing the number of shoot branches (89.2%), plant weight (87.5%), root length (83.3%), shoot height (57.9%) and total leaf area (35.1%) than the control seedlings. The findings of this study underscore the significant potential of manglicolous yeasts in contributing to mangrove conservation and restoration efforts, offering a comprehensive understanding of their diverse plant growth-promoting mechanisms and highlighting their valuable role in sustainable ecosystem management.

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Acknowledgements

This work was funded by the Kerala University of Fisheries and Ocean Studies aided research project (KARP) scheme, Order No: DoR (1)/5587/2021. The authors would also like to acknowledge the Centre for Bioactive Substance from Marine Organisms (CBSMO), KUFOS. The authors would also like to acknowledge the support rendered by Dr. S. Suresh Kumar, The Dean, of the Faculty of Ocean Science and Technology, Kerala University of Fisheries and Ocean Studies. The authors would also like to acknowledge Mrs. Renjitha Reghunath, Assistant Professor in P.G. Department of English and Research Centre, St. Xaviers College for Women, Aluva for invaluable assistance in correcting the English language of this manuscript.

Funding

This work was funded by grants from the Kerala University of Fisheries and Ocean Studies (Order No: DoR (1)/5587/2021).

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Study conception and design: K A N, K M. Material preparation, and analysis were performed by K A N. Data collection: K A N, H A. The draft of the manuscript was written by K A N. K M, K K edited and approved the manuscript.

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Correspondence to K. Manjusha.

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Communicated by Sanjai Saxena.

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Nimsi, K.A., Arya, H., Manjusha, K. et al. Multifarious plant growth-promoting traits of mangrove yeasts: growth enhancement in mangrove seedlings (Rhizophora mucronata) for conservation. Arch Microbiol 206, 192 (2024). https://doi.org/10.1007/s00203-024-03913-9

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  • DOI: https://doi.org/10.1007/s00203-024-03913-9

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