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Native bio-control agents from the rice fields of Telangana, India: characterization and unveiling the potential against stem rot and false smut diseases of rice

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Abstract

The stem rot caused by Sclerotium hydrophilum and false smut caused by Ustilaginoidea virens are two of the major production constraints in rice cultivation in India and other countries. Stem rot and false smut can be effectively controlled with synthetic fungicides. However, the indiscriminate use of chemical fungicides may cause development of resistance among the pathogens. In addition to this, synthetic fungicides also exhibit harmful impacts on the environment. Exploiting microbe-based alternatives for managing plant diseases diminishes public concerns about the ill effects of pesticide usage in crops. In this regard, the present study was designed to investigate the potential of native microbial biocontrol agents (BCAs) from rice rhizosphere for the sustainable management of stem rot and false smut diseases in rice. Potential BCAs and pathogens were identified and characterized through morphological, biochemical, and sanger sequencing techniques. Bio-efficacy tests of potential BCAs against stem rot and false smut diseases on rice under glasshouse conditions indicated higher seed vigour index of the treated seeds, significant improvement in the growth of the seedling, increased dry weight, reduction in percentage disease index viz., 70.03% (stem rot) and 69.24% (false smut) over the control plants. Phytohormones indole acetic acid (IAA), abscisic acid (ABA), gibberellic acid (GA), salicylic acid (SA), and zeatin (tZ) were detected and quantified in the four potential BCAs using liquid chromatography- tandem mass spectrometry (LC–MS/MS). Scanning electron microscopy (SEM) studies revealed the endophytic nature of the strains in rice. The study indicated a positive correlation between the diversity and concentration of phytohormones released by the bioagents and enhanced plant growth promotion and disease suppression in rice.

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All data generated or analyzed during this study are included in this published article. Any additional information can be made available upon request by the corresponding author.

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Acknowledgements

The authors thank Mrs. Jyothi Chaitanya and Mr. Gnanadhar for their help towards this work. We would also like to acknowledge the help and support received from the Department of plant pathology, PJTSAU, and ICAR-IIRR, Rajendranagar, Hyderabad for this study.

Funding

This study was funded by DARE, ministry of government, India. corresponding author has received research support from ICAR-IIRR.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by SV, MP, RGNS, KC is the principal investigator of this work. Contributed reagents/materials/analysis tools by BM, LLD, KP, JG, SR, SPM, SRM. The manuscript was written by SV, MP, RGNS, SM, UDG, RP commented and checked the manuscript.

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Correspondence to C. Kannan.

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Vanama, S., Gopalan, N.S.R., Pesari, M. et al. Native bio-control agents from the rice fields of Telangana, India: characterization and unveiling the potential against stem rot and false smut diseases of rice. World J Microbiol Biotechnol 40, 2 (2024). https://doi.org/10.1007/s11274-023-03782-2

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  • DOI: https://doi.org/10.1007/s11274-023-03782-2

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