Three bacterial strains Bacillus sp, Proteus sp, and Pseudomonas sp isolated from paddy rhizosphere soil were screened for IAA production. All the three bacterial isolates were able to produce IAA. These isolates were also tested for IAA production at different pH and in different time intervals. Pseudomonas sp was able to produce higher amount of IAA at pH 7(12.81µg/ml) and on 7 d (12.78µg/ml). The bioassay result reveals that the crude IAA extract from Pseudomonas sp can promoted the germination percent (90),vigour index (495) shoot (3.8cm) and root length (10.0cm)in paddy, Oryza sativa in T9 on 7th day compared to other treatments and in control.
Rhizosphere, Bacterial isolates, IAA
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