Subscribe Now Subscribe Today
Science Alert
Curve Top
Journal of Environmental Science and Technology
  Year: 2012 | Volume: 5 | Issue: 3 | Page No.: 184-191
DOI: 10.3923/jest.2012.184.191
Facebook Twitter Digg Reddit Linkedin StumbleUpon E-mail

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

Durga Prasad, Gangavarapu Subrahmanyam and Krishna Bolla

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.
PDF Fulltext XML References Citation Report Citation
  •    Relationship Between Physiological and Biochemical Effects of Cadmium Toxicity in Nicotiana rustica
  •    Effect of Heavy Metals on Ca2+ Concentration in Muscle Tissue of Grass Carp and Silver Carp
  •    Comparative Analysis of Soil Nutrient Balance at Farm Level: A Case Study in Jimma Zone, Ethiopia
  •    The Inhibition of Bean Plant Metabolism by Cd Metal and Atrazine: I. The Effect of Atrazine with Cd Metal on Growth, Photosynthesis, Nutritional Level and Rhizosphere of Soil
  •    Lead, Nickel, Vanadium, Cobalt, Copper and Manganese Distributions in Intensely Cultivated Floodplain Ultisol of Cross River, Nigeria
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






Curve Bottom