Isolation of toxic metal-tolerant bacteria from soil and examination of their bioaugmentation potentiality by pot studies in cadmium- and lead-contaminated soil

International Microbiology : the Official Journal of the Spanish Society for Microbiology
Soumitra NathIndu Sharma

Abstract

Heavy metals, also regarded as toxic metals, are the important environmental pollutants that affect all forms of life. Accumulation of toxic metals in plants results in various biochemical, physiological and structural disturbances, leading to inhibited growth and sometimes plant death. Toxic metal contamination disturbs the soil ecology as well as the agricultural productivity. Several indigenous microbes can withstand the effect of toxic metal and play a vital role in the revival of tarnished soil. In the present study, soil samples were collected from contaminated crop field of Cachar district of Assam, India. Segregation, enumeration and identification of bacteria from soil samples were performed. Among all the tested isolates, very few were able to withstand a high concentration of Cd and Pb in nutrient agar plates. Toxic metal-tolerant bacteria were identified as Pseudomonas aeruginosa and Bacillus cereus. The isolates having a higher tolerance for Cd and Pb were taken into consideration for pot studies. P. aeruginosa strain SN4 and strain SN5 showed significant results at Cd- and Pb-contaminated soil, evidenced by the healthy growth of Oryza sativa seedlings. However, B. cereus strain SN6 showed high tolerance towards Cd...Continue Reading

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Datasets Mentioned

BETA
KF447770
KF447771
KM489153

Methods Mentioned

BETA
PCR

Software Mentioned

BLAST
Clustal
aligner
Geneious

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