Author(s):

S Abirami, D Nagarajan and B Clara Preethi Rodrigo

Abstract: There is an experimental results showed that<em> Pseudomonas fluorescens</em> and<em> Rhizobium leguminosarum </em>were able to colonise the root environment where they carried out a variety of interactive activities to enhance plant growth and soil fertility.<em> P. fluorescens</em> was isolated from rhizosphere soil and <em>R.leguminosarum</em> from root nodules. <em>Phaseolus mungo </em>L. plant (black gram) was inoculated with <em>P. fluorescens</em>,<em> R. leguminosarum</em> by using seed bacterisation inoculants and soil application methods. Seed bacterisation has been proved to be more effective than soil applications. Results of pot experiments revealed that, the co-inoculation of <em>P. fluorescens</em> and<em> R. leguminosarum</em> showed highest growth promoting effects in black gram than the individual inoculations, because of one or more growth promoting mechanisms like phytohormones, organic acids, siderophores, enzymes and exopolysaccharides produced by rhizophia in the rhizosphere soil could be responsible for evoking the growth stimulating response in the inoculated plants.

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