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Plant growth promoting rhizobacteria (PGPR) are known to enhance growth of plants by involving various direct and indirect mechanisms. About sixteen rhizobacterial isolates were isolated from various rhizospheric soils of tomato crops in the fields of Dehradun. These bacterial isolates were phenotypically characterized and were subjected to in vitroscreeningfor their plant growth promoting traits like ammonia andsiderophore production,production of indole acetic acid (IAA), hydrogen cyanide (HCN) and phosphate solubilization.Out of sixteen bacterial isolate, three bacterial isolates proved to have potential PGPR activities. The production of indole acetic acid (IAA) by all rhizobacteria was investigated as possible mechanism for plant growth stimulation. All rhizobacterial isolates were shown to produce IAA in vitroin presences of L-tryptophan in the culture medium. The isolates were also tested for their efficacy in seed germination and seedling vigour by using tomato seeds in roll towel method.All rhizobacterial isolates also showed an increased in both the shoot and the root length of tomato seedlings as compared to the control. The seed germination ranged from 90 percent (uninoculated control) to 98.5 percent. All the three strains GKS-V, HPR-I, HPR-III significantly improved seed germination when compared to the uninoculated control (UIC). These isolate showed significantly increased in shoot and root length as well as enhanced vigour index of 124.54 and 741.45 after 6 and 16 days respectively. From biochemical tests it was concluded that all the three selected rhizobacteria belong to Pseudomonas species.

CHARACTERIZATION OF PSEUDOMONAS SP FROM RHIZOSPHERE OF TOMATO PLANTS (LYCOPERSICON ESCULENTUM) AND ITS EFFICACY ON PLANT GROWTH PROMOTION