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Bioprospecting of multi-stress tolerant Pseudomonas sp. antagonistic to Rhizoctonia solani for enhanced wheat growth promotion

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Abstract

Salt affected cotton rhizospheric soil was explored for multi-stress resistance microbes to obtain 46 rhizobacteria. Of these, seven strains strongly inhibited the growth of phytopathogenic fungus Rhizoctonia solani by virtue of antifungal compound 2,4-diacetylphloroglucinol (DAPG) production. These seven strains demonstrated an array of plant growth-promoting activities as follows: (i) production of indole-3-acetic acid, ammonia, siderophore; (ii) solubilisation of phosphate, while two isolates showed Zn solubilisation. The phenetic and 16S ribotyping revealed affiliation of all the isolates to Pseudomonas guariconensis and presence of phlD gene marker for DAPG production. Among the seven isolates, strain VDA8 showed the highest DAPG production (0.16 μg ml−1) in liquid synthetic medium under aerobic conditions at 28 °C. Furthermore, sucrose, peptone, sodium hydrogen phosphate, ZnSO4, pH 8.0, and NaCl (1%) were observed as the best carbon, nitrogen, phosphate, trace element, pH, and salt concentration, respectively for maximum production of DAPG by strain VDA8 (3.62 ± 0.04 μg ml−1). The strain VDA8 was further assessed for wheat (Triticum aestivum) growth promotion by seed biopriming under laboratory (plate assay) and field condition in alkaline saline soil with pH 8.5. The field scale (324 m2) trials demonstrated 28.6% enhanced grain production compared to control demonstrating the newly isolated Pseudomonas sp. as multi-potent bioinoculant.

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Data availability

The data that support the findings of this study available and sequence data was deposited to the GenBank under the accession numbers MN577429, MN577430, MN577431, MN577432, MN577433, MN577434, and MN577435.

Materials availability

The data supporting the findings of this study are available within the article and its supplementary materials.

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Funding

The work is supported by the Department of Science and Technology (DST, New Delhi India) WOS-A (DST letter no. SR/WOS-A/LS-1209/2014(G) dated 12.05.2015) and Dr. Navin D. Dandi as a mentor. We also acknowledge Rajiv Gandhi Science and Technology Commission, Government of Maharashtra (KBCNMU/RGSTC/Sanction Order/30 dated 25.02.2020), University Grants Commission (U.G.C), New Delhi, and Department of Science and Technology (D.S.T), New Delhi, for funding under SAP and FIST program respectively, to the university. The authors are also thankful to JITC Park, Jalgaon, for field trial support.

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Authors and Affiliations

  1. Drs. Kiran &, Pallavi Patel Global University (KPGU), Vadodara, Gujarat, India

    Ambalal B. Chaudhari

  2. Kavayitri Bahinabai Chaudhari North Maharashtra University, Jalgaon, 425001, Maharashtra, India

    Raksha A. Kankariya, Prasad V. Jape, Rajkamal P. Patil & Navin D. Dandi

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  1. Raksha A. Kankariya
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  2. Prasad V. Jape
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  4. Ambalal B. Chaudhari
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Kankariya Raksha A., Jape Prasad V., Patil Rajkamal P., Chaudhari Ambalal B., and Dandi Navin D. The first draft of the manuscript was written by Kankariya Raksha A. and finally, authors Chaudhari Ambalal B. and Dandi Navin D. read and approved the final manuscript.

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Correspondence to Navin D. Dandi.

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Kankariya, R.A., Jape, P.V., Patil, R.P. et al. Bioprospecting of multi-stress tolerant Pseudomonas sp. antagonistic to Rhizoctonia solani for enhanced wheat growth promotion. Int Microbiol (2024). https://doi.org/10.1007/s10123-024-00517-7

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