The paddy rhizosphere soil sample was collected from 10 different locations and the Pseudomonas fluorescens & Bacillus subtilis isolates were characterized. The ten P. fluorescens & B. subtilis isolates were tested for their efficiency of IAA production, Gibberellic acid, Siderophore production and Phosphate solubilization. Among the various isolated of P. fluorescens & B. subtilis, the isolate PF-8 and BS-8 was selected as a more efficient strain and that strains were used for the Mutagenesis studies. The EMS mutated P. fluorescens & B. subtilis showed more plant growth promoting substances...

In the present study, soil samples were collected from ten different locations and the physico chemical properties & microbial population of the soil samples were analyzed. The PGPR organisms viz., Azospirillum, Pseudomonas, Azotobacter and Bacillus were isolated from ten different soil samples purified and maintained for further studies. The PGPR isolates of Pseudomonas, Azospirillum, Azotobacter and Bacillus were screened for there efficiency by determining the ability to produce phytohormone IAA, N fixation and phosphorus solubilization. The selected PGPR isolates viz., Azs-2, Ps-2 and...

The paddy rhizosphere soil sample was collected from 10 locations in Cuddalore district of Tamil Nadu. The Pseudomonas fluorescens isolates were characterized by Gram staining, motility test, plating on selective medium and performing biochemical tests. The Pseudomonas fluorescens isolates were designated as PF -1 to PF - 10. The ten Pseudomonas fluorescens isolates obtained from the rhizosphere of paddy were tested for their efficiency of plant growth promoting substance production. Maximum production was recorded by the isolate PF-8 and minimum production was found in PF-4. The...