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International Microbiology

, Volume 21, Issue 1–2, pp 35–45 | Cite as

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

  • Soumitra Nath
  • Bibhas Deb
  • Indu Sharma
Original Article
  • 36 Downloads

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 and Pb, but pot experimental studies showed adverse effects on seedling germination and shoot growth of O. sativa. P. aeruginosa strains were significantly able to reduce the negative impact of Cd and Pb in the soil, thus finding an alternative in removal, recovery and remediation of toxic metal-contaminated crop field.

Keywords

Toxic metals Bioaugmentation 16S rDNA Oryza sativa Pseudomonas aeruginosa 

Notes

Acknowledgements

The authors extend their thanks to the DBT, New Delhi, for the establishment of Institutional Biotech Hub and Bioinformatics Centre and facilitating the research in Gurucharan College, Silchar, India. This study was also supported by Director of Agriculture, Cachar, Assam, India. All the staff members of Agriculture Office are acknowledged for providing some departmental reports. Special thanks to District Soil Testing Department, Cachar, India, for providing necessary arrangements during the survey period and data collection.

Supplementary material

10123_2018_3_MOESM1_ESM.pdf (189 kb)
ESM 1 (PDF 189 kb)
10123_2018_3_MOESM2_ESM.pdf (233 kb)
ESM 2 (PDF 233 kb)
10123_2018_3_MOESM3_ESM.pdf (291 kb)
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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of BiotechnologyGurucharan CollegeSilcharIndia
  2. 2.Department of MicrobiologyAssam UniversitySilcharIndia

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