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Research Journal of Microbiology
Year: 2020  |  Volume: 15  |  Issue: 2  |  Page No.: 61 - 67

Phytohormone Biosynthesis by Indigenous Rhizobacteria of Vegetable Crops in a Semi-arid Agro-environment

Oke Kingsley Oyediran, Aseri Gajender Kumar and Jain Neelam    

Abstract: Background and Objective: Efficacy of rhizosphere microorganisms to synthesis phytohormone is a key survival strategy for plants growing under environmentally stressed conditions. Thus, this study aimed at investigating potentials of four indigenous rhizobacteria of vegetables at semi-arid agro-zone of Rajasthan desert, India, to synthesize Indole Acetic Acid (IAA), cytokinin (CK) and Gibberellic Acids (GA3). Materials and Methods: Isolates (Azospirillum brasiliense (IR25), Azotobacter chrocoocum (IR28), Pseudomonas stutzeri (IP32) and Pseudomonas putida (IP35)) were screened for plant growth-promoting attributes. HPLC, TLC and spectrophotometry were used for phytohormone characterization, recovery and quantification at 72, 96 and 120 h time intervals. Results: All isolates possessed substantive growth-promoting traits and produced pink, fluorescent and green colors confirming synthesis of IAA, CK and GA3, respectively. At 96 h time interval, highest IAA was recorded by IR25 followed by IP35 which was slightly higher than IR28 and IP32. Maximum CK was found in IR25 followed by IR28 while IP35 recorded slightly higher concentration than IP32. GA3 recorded by IR25 was highest, IP35 was next with higher value than IR28 and IP32. Conclusion: All isolates produced significantly high phytohormones that can be transformed into effective bio-formulations for use in sustainable vegetable production at semi-arid agro-zone of Rajasthan desert.

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