Abstract
Purpose
Soil-borne bacterial wilt disease caused by the bacterial plant pathogen Ralstonia solanacearum is a serious concern worldwide, resulting in huge economic losses in solanaceous vegetables. This study confirms the field efficacy of microbe-enriched organic fertilizer application in successful management of eggplant bacterial wilt disease.
Methods
Four potential Bacillus strains isolated from diverse soils of Andaman Islands were evaluated using the microbe-enriched farmyard manure (MFYM) approach for bacterial wilt suppression and yield increase in both the greenhouse and field conditions. Also, changes in the bacterial wilt pathogen and putative Bacillus counts on MFYM applications were studied.
Results
Bacillus strains used in this study were confirmed for their indole acetic acid (IAA) production, phosphate solubilization, and siderophore production traits in vitro. In addition, species identity was confirmed through rpoB gene sequences analysis. In both greenhouse and field experiments, MFYM treatments showed better biological control potential and increase in yield compared to farmyard manure (FYM) alone and unamended control treatments. In comparison to control and other treatments, the MIC-Consortia demonstrated the highest biocontrol potential across all treatments in pot culture (90.6%), first field (78.8% and 72.1%), and second field (61.5% and 75%) studies, respectively. Similarly, the MIC-Consortia showed highest yield in the first field (61.5% and 75%) and second field (60% and 48.1%), respectively, when compared to other treatments. Further, the studies of microbial counts in treated soils revealed that the pathogen population increased throughout the cropping season, but the rate of increase was found slower in MFYM treatments.
Conclusion
This study showed that the MIC-Consortia when applied along with FYM could effectively suppress eggplant bacterial wilt disease incidence and enhance yield performance in two different field conditions over two successive years. The results could be used in devising efficient eco-friendly management strategies for bacterial wilt disease in organic farming practices.
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Acknowledgements
We thank Directors, ICAR-CIARI, Port Blair and ICAR-NBAIM for their kind support. This research was supported by grants from a mega-network project entitled Application of Microorganisms for Agriculture and Allied Sector (AMAAS) of ICAR-NBAIM, Mau, India through sub-project ‘Exploring Antimicrobial Peptide Genes in Developing Bioformulation for the Management of Plant Disease of Andaman and Nicobar Islands’.
Funding
This research was supported by grants from a mega-network project entitled Application of Microorganisms for Agriculture and Allied Sector (AMAAS) of ICAR-NBAIM, Mau, India through sub-project ‘Exploring Antimicrobial Peptide Genes in Developing Bioformulation for the Management of Plant Disease of Andaman and Nicobar Islands’.
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KS, KM, AB performed the lab, pot culture studies and analyzed the data; PK supervised field experiments and RKG, AK, SKS supervised the overall work, drafted, and edited the manuscript.
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Sakthivel, K., Manigundan, K., Gautam, R.K. et al. Microbe-enriched farm yard manure (MFYM) approach for the suppression of Ralstonia solanacearum Yabuuchi (Smith) inciting bacterial wilt disease in eggplant (Solanum melongena L.). Plant Soil 491, 303–315 (2023). https://doi.org/10.1007/s11104-023-06119-y
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DOI: https://doi.org/10.1007/s11104-023-06119-y