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Genetic Diversity Among Cold-Tolerant Fluorescent Pseudomonas Isolates from Indian Himalayas and Their Characterization for Biocontrol and Plant Growth-Promoting Activities

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Abstract

In Uttarakhand, the Organic State of India, where soils in most farming situations are deficient in nutrients and loss of crops due to soil- and seed-borne pathogens is rampant, use of native plant growth-promoting rhizobacteria (PGPRs) possessing biocontrol (BC) activities holds promise. In view of this, 600 native cold-tolerant rhizospheric bacterial isolates were collected from Uttarakhand Himalayas, of which 336 were confirmed as fluorescent Pseudomonas spp. On the basis of specific biochemical tests, these were characterized into three major groups: P. fluorescens (308 isolates), P. aeruginosa (20 isolates), and P. putida (8 isolates). Most of the isolates could grow at 8°C after 12 h of incubation, confirming their cold tolerance. In vitro biocontrol assays revealed that of 336 isolates, 74 were antagonistic to Rhizoctonia solani and 91 to Fusarium solani, the two major pathogens associated with root-rot complex in vegetables widespread in the region. Simultaneously, good HCN producers (33 isolates), siderophore producers (80 isolates), and P solubilizers (49 isolates) were also identified, which could increase the biocontrol and plant growth-promoting efficacies of the putative PGPRs. Among the different species and biovars, P. fluorescens biovar-I had the maximum number of potential isolates with BC and plant growth-promoting (PGP) activities. In French bean, under polyhouse and field conditions, five isolates (Pf-173, Pf-193, Pf-547, Pf-551, and Pf-572) showed good BC and PGP activities as up to 93% reduction in root rot was achieved. A combination of all five isolates was found to be best with respect to BC and PGP activities. In a set of 59 fluorescent Pseudomonas isolates, RAPD-PCR analysis, using three random oligodecamer primers, revealed high diversity and formed ten distinct clusters, corresponding to the host of origin (annual or perennial) or habitat (farming situations) of the isolates. The amount of diversity revealed in the set of fluorescent Pseudomonas isolates could represent enormous diversity that exists in the wild that could be exploited for improved BC and PGP activities of the PGPRs. For the first time, this study led to a large-scale characterization and repositioning of fluorescent pseudomonads from the Indian Himalayas.

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Acknowledgments

We thank Neeraj Kumar and Devender Singh for their assistance in some aspects of the study. Necessary facilities provided by the Dean of the College of Forestry and Hill Agriculture, G. B. Pant University of Agriculture & Technology, Ranichauri (Uttarakhand), India, are gratefully acknowledged.

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Authors and Affiliations

  1. G. B. Pant University of Agriculture and Technology,Pantnagar, Udham Singh Nagar, Uttarakhand, India

    Yogesh Kumar Negi, Deepti Prabha & J. Kumar

  2. Dr. R. M. L. Awadh University, Faizabad, Uttar Pradesh, India

    Satyendra K. Garg

  3. SBS PG Institute of Biomedical Sciences and Research, Balawala, Dehradun, Uttarakhand, India

    Yogesh Kumar Negi

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  1. Yogesh Kumar Negi
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  4. J. Kumar
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Correspondence to Yogesh Kumar Negi.

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Negi, Y.K., Prabha, D., Garg, S.K. et al. Genetic Diversity Among Cold-Tolerant Fluorescent Pseudomonas Isolates from Indian Himalayas and Their Characterization for Biocontrol and Plant Growth-Promoting Activities. J Plant Growth Regul 30, 128–143 (2011). https://doi.org/10.1007/s00344-010-9175-7

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