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Effect of Indole-3-Acetic Acid (IAA) Produced by Pseudomonas aeruginosa in Suppression of Charcoal Rot Disease of Chickpea

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Abstract

The production of indole-3-acetic acid (IAA), by rhizobacteria, has been associated with plant growth promotion, especially root initiation and elongation. Isolate TO3 selected from 103 fluorescent pseudomonads, identified as Pseudomonas aeruginosa, showed maximum production of IAA. Isolate TO3 having biocontrol activity against Macrophomina phaseolina also showed production of siderophore and HCN was used to screen the role of bacterial IAA in reducing the level of charcoal rot disease occurrence in chickpea. Four IAA defective stable mutants of isolate TO3 having biocontrol activity against M. phaseolina were developed through 5-bromouracil mutagenesis. Mutant TO52 showed 76.47% reduction in production of IAA. Standard IAA was used in similar concentration as present in cell-free culture supernatant of wild isolate TO3 and its mutant TO52. The in vitro and in vivo study showed that IAA-defective mutant TO52 caused reduced biocontrol and plant growth promotory activity than wild isolate TO3. Standard IAA showed comparable biocontrol activity to the culture supernatant. To some extent better biocontrol and growth promotory activity in supernatant than standard IAA indicates the synergistic role of siderophore and HCN. The study clearly reports the role of bacterial IAA in suppression of charcoal rot disease of chickpea.

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Acknowledgments

Thanks are due to Department of Biotechnology, New Delhi for the financial support for the study. E.K. is thankful to Council of Scientific and Industrial Research, New Delhi. The authors are grateful to Vice Chancellor, Chhatrapati Shahu Ji Maharaj University, Kanpur, India, for providing facilities and support.

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  1. Department of Microbiology, Chhatrapati Shahu Ji Maharaj University, Kanpur, 208024, UP, India

    Ekta Khare & Naveen Kumar Arora

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  1. Ekta Khare
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  2. Naveen Kumar Arora
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Correspondence to Naveen Kumar Arora.

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Khare, E., Arora, N.K. Effect of Indole-3-Acetic Acid (IAA) Produced by Pseudomonas aeruginosa in Suppression of Charcoal Rot Disease of Chickpea. Curr Microbiol 61, 64–68 (2010). https://doi.org/10.1007/s00284-009-9577-6

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  • DOI: https://doi.org/10.1007/s00284-009-9577-6

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