Adesh Kumar*, K.N. Singh, Suresh Kumar and Satendra Kumar**
Deptt. of Plant Molecular Biology & Genetic Engg., N.D. U. & T., Kumarganj (Faizabad)-224 229
**Department of Soil Science, S.V.P.University of Agriculture & Technology, Meerut-250110
*Email-adesh.kumar88@yahoo.com
Abstract: Plant growth promoting rhizobacteria (PGPR) are known to influence plant growth by various direct or indirect mechanisms. In search of efficient PGPR strains with high activity of IAA , a total of 58 isolates belonging to Pseudomonas, Azotobacter and Bacillus were screened for plant growth promoting trait ie. indole acetic acid (IAA).The eighteen isolates (nine Azotobacter, six Pseudomonas and three Bacillus) were evaluated for quantitative IAA production. All the Azotobacter isolates shown to produce higher range (95.60-175.20 µg/ml) of IAA, while Pseudomonas produced (44.40- 95.00 µg/ml) IAA. More interestingly all Bacillus isolates also shown high potential of producing in the range of
95.60-170.20 µg/ml of IAA. The isolate Azt5, Bc1 and Bc3 tolerated 7% NaCl concentration.
Keywords: PGPR, Wheat Rhizosphere, Indole acetic acid, Salt tolerance
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