Plants growth promoting rhizobacteria (PGPR) is one of the important group of microorganism involved in the production of growth promoting substances and enhance the growth and yield of crop either directly or indirectly. In the present study fifteen rhizosphere soil samples of chilli were collected in cuddalore district of Tamilnadu. The population of microbial groups such as bacteria, fungi and actinomycetes were estimated by serial dilution and pour plating method.The total bacterial population ranged from 1.33 to16.33x106 cfu g-1 of soil ,fungal population ranged from 7.33 to 13.00x104 cfu g-1 of soil and the antinomycetes population were ranged from 2.00 to 9.6633x105 cfu g-1 of soil. The occurence of pseudomonas fluorescens were also analysed and the population was ranged from 2.33 to 4.66x105 cfu g-1 of soil. The pseudomonas isolates were further studied for their efficiency of IAA and siderophore production. The maximum IAA was produced by the isolate DSP6 and siderophore was produced by the isolate DSP9.
