Effect of Cadmium on Abundance and Diversity of Free Living Nitrogen Fixing Azotobacter spp.


	Journal of Environmental Science and Technology
	Year: 2012 \| Volume: 5 \| Issue: 3 \| Page No.: 184-191 DOI: 10.3923/jest.2012.184.191

Effect of Cadmium on Abundance and Diversity of Free Living Nitrogen Fixing Azotobacter spp.

Durga Prasad, Gangavarapu Subrahmanyam and Krishna Bolla

Abstract: Soil pollution by elevated heavy metals are known to adversely effect microbial activities and their functional diversity. However, response of certain beneficial native soil bacterial population to heavy metals is poorly understood. In the present study, effect of cadmium (Cd²⁺) on abundance and diversity of free living nitrogen fixing Azotobacter spp. has been investigated by short term microcosm experiment. After 45 days, total viable counts of both heterotrophic and Azotobacter spp. have been decreased with increased Cd²⁺concentrations. Significant negative correlation (R = -0.99, p = 0.006) was observed between abundance of Azotobacter spp. and Cd²⁺concentration. Similar kind of result has been noticed with total viable heterotrophic bacteria. Amplified ribosomal DNA restriction analysis (ARDRA) based dendrogram revealed the Cd²⁺induced diversity shift of Azotobacter population. Relatively decreased diversity of Azotobacter spp. was noticed at elevated concentration of Cd²⁺(5 mg kg^-1 soil). Reduction of both abundance and diversity of Azotobacter spp. pointed apparent deleterious effect of Cd²⁺ on free living nitrogen fixation and concurrent soil health.

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How to cite this article:

Durga Prasad, Gangavarapu Subrahmanyam and Krishna Bolla, 2012. Effect of Cadmium on Abundance and Diversity of Free Living Nitrogen Fixing Azotobacter spp.. Journal of Environmental Science and Technology, 5: 184-191.

DOI: 10.3923/jest.2012.184.191

URL: https://scialert.net/abstract/?doi=jest.2012.184.191

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