National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Rhizosphere is the narrow region of soil that is directly influenced by root secretions and associated soil microorganisms. The microbe- plant interaction in the rhizosphere can be beneficial, neutral, variable, or deleterious for plant growth. Rhizobacteria that exert beneficial effects on plant development are termed plant growth promoting rhizobacteria (PGPR). In the present investigation the biodiversity of bacteria in rhizosphere and rhizoplane of Solanum melongena and their physiochemical characteristics was studied. The results revealed that the population density of Rhizosphere (RS) and Rhizoplane (RP) bacteria was maximum during September being 2.85X108CFU/g and 2.95X108 CFU/g respectively which declined to 1.95X108CFU/g and 2.15X108CFU/g respectively in January. Sixteen bacterial flora viz. Bacillus polymyxa, B. mycoides, Azotobacter chroococcum, Pseudomonas fluorescence, Trichoderma harzianum, Staphylococcus sp, Streptococcus sp, Klebsiella sp, Micrococcus sp, Corynebacterium sp, Arthrobacter sp, Lactobacillus sp, Clostridium sp, Enterococcus sp, Escherichia coli and Citrobacter sp were recorded in the rhizosphere and rhizoplane of Solanum melongena. Among these only three isolates viz. Bacillus polymyxa, Pseudomonas fluorescence, and Lactobacillus showed catalase negative reaction. Bacillus mycoides, Pseudomonas fluorescence, Corynebacterium, and Citrobacter showed anaerobic (Hugh- Leifson’s O- F) negative result. Azotobacter chroococcum, Pseudomonas fluorescence, Corynebacterium and Lactobacillus were non hemolytic whereas Trichoderma, Staphylococcus, Klebsiella and Micrococcus were recorded as hemolytic microbes. Trichoderma, Klebsiella and Micrococcus showed Voges Proskaur negative reaction. All isolates recovered from rhizoplane exhibited siderophore production. All the rhizospheric bacteria showed maximum Phosphate-solubilizing ability and, therefore, can be exploited as bioinoculants/ biofertilizers for improvement of crops.
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