PCR amplification of bacterial DNA from inoculated black gram roots. Lanes 1-DNA from uninoculated plants-P. fluoresens primers, 2-DNA from P. fluorescens treated plants-P. fluoresens primers, 3-DNA fromP. fluorescens and B. subtilis treated plants-P. fluoresens primers, 4-DNA from uninoculated plants-B. subtilis primers, 5-DNA from B. subtilis treated plants-B. subtilis primers, 6-DNA from P. fluorescens andB. subtilis treated plants-B. subtilis primers.