Studies on the Occurance of Diazotrophs from the Rhizosphere of Low Land Rice Grown Regions of Tamil Nadu
Kalaiarasu S.*
Department of Microbiology, Faculty of Agriculture, Annamalai University, Annamalai Nagar - 608002, Tamil Nadu, INDIA
P. Manikandan
Department of Microbiology, Faculty of Agriculture, Annamalai University, Annamalai Nagar - 608002, Tamil Nadu, INDIA
DOI: NIL
Keywords: Azospirillum, diazotrophic populations, lowland rice, Rhizosphere
Abstract
A survey was conducted for the occurrence of community diazotrophic populations, namely, Azospirillum, Pseudomonas sp. and Bacillus sp. from the rhizosphere of lowland rice was conducted at different locations of Tamil Nadu. The survey revealed the ubiquitous occurance of diazotrophs in rice rhizosphere where the occurance Azospirillum brasilence was found to be at higher level followed by Pseudomonas sp. and Bacillus sp. A total numper 84 diazotrophic strains, namely 28 no. of Azospirillum, 28 no. of Pseudomonas sp. and 28 no. of Bacillus sp. were isolated. The results of the present study also revealed a marked variation in the community population of Azospirillum, Pseudomonas and Bacillus in the locations of Tamilnadu, observed. A range of 0.89 per cent to 1.41 per cent of Azospirillum, 1.12 per cent to 2.50 per cent of Pseudomonas and 0.51 per cent to 0.97 per cent of Bacillus to the total bacterial population was observed in the survey.
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