Ethnobotanical survey of medicinal plants from Vellore district, Tamil nadu, India

P. Saranraj, L. Bhavani, K. Suganthi
2016 International Journal of Advanced Research in Biological Sciences (IJARBS)  
Pseudomonas species are important plant growth promoting rhizobacteria (PGPR) used to enhance crop yield by direct and indirect mechanisms. Several researchers have shown that fluorescent Pseudomonas is abundant in the rhizosphere of different crops. The paddy rhizosphere soil sample was collected from ten different locations in Cuddalore district of Tamil Nadu. The population of bacteria, fungi and actinomycetes in the rhizosphere soil sample of paddy was estimated by Serial dilution and Pour
more » ... dilution and Pour plating method. The total bacterial population ranged from 15.8 to 24.3 × 10 cfu gG of soil and the highest population of 24.3 × 10 cfu 6 1 6 gG was observed in soil of Sivapuri. The total fungal and actinomycetes population were ranged between 1 8.9 to 13.3 × 10 cfu gG and 10.5 to 19.3 × 10 cfu gG of soil respectively. The occurrence of Pseudomonas 3 1 5 1 fluorescens also examined and the population ranged between 7.71 × 10 cfu gG and 7.21 x 10 cfu gG of soil. 6 1 6 1 The Pseudomonas fluorescens was isolated by Pour plate method. The isolate Pseudomonas fluorescens were characterized by Gram staining, motility test, plating on King's B medium and bio-chemical tests. The ten Pseudomonas fluorescens isolates obtained from the rhizosphere of paddy were tested for their efficiency of IAA production. The maximum IAA production was recorded by the isolate PF-8. The minimum production of IAA was found in PF-4 isolates. The isolate Pseudomonas fluorescens (PS-8) showed maximum Siderophore production and the least Siderophore production was showed by the Pseudomonas fluorescens isolate PS-4.
doi:10.22192/ijarbs.2016.03.09.032 fatcat:jws6tny57rg6xcgz7b4jupt55u