While screening the best candidate for plant growth promoting attributes, gram positive bacilli get the special attention due to good survival rate under unfavorable conditions. Three bacilli strains, isolated from the rhizospheric region of different crops, were evaluated for their auxin production potential and their plant growth promoting capability for Vigna radiata (L.) plant. All strains were found to synthesize auxin when grown in LB broth emended with L-tryptophan in vitro condition that was further confirmed by high performance liquid chromatography HPLC. Model plant Arabidopsis thaliana was used to check the effect of bacilli in root morphogenesis of this plant. Strains led the increase in primary root length and lateral root density significantly (P=0.05) over control. Bacterization of Vigna radiata seeds with bacilli isolates resulted in the increase of the root length, shoot length, fresh and dry biomass of the seedlings significantly (P=0.05) over uninoculated control under laboratory conditions. Similar effects were observed under natural conditions in which shoot biomass and yield were increased significantly as compared to non-inoculated ones. Rhizospheric isolated strains showed the best results in growth enhancement of the plant growth and considered as good addition as a best biological candidate in the selection of plant phytostimulator.
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