Effect of plant growth promoting rhizobacteria for the growth and yield of coleus forskohlii

Author: 
Sakthivel. U and B. Karthikeyan

The effect of microbial consortium consisting plant growth promoting rhizobacteria (PGPR) like Azospirillum, Azotobacter, Pseudomonas and Bacillus were tested separately and in combination on Coleus forskohlii for pot culture experiment. The combinations of above mentioned PGPR strains significantly increased plant height, number of tubers, tuber length and tuber yield in Coleus forskohlii when compared to the uninoculated control. Plant growth promoting rhizobacteria (PGPR) exhibit direct and indirect mechanisms as plant growth promoters and biological control agents. Direct mechanism by PGPR, include the provision of bio-available phosphorus for plant uptake, nitrogen fixation for plant. The results of this study suggest that the PGPR applied in combination have yield of Coleus forskohlii.

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