Arsenic Hyper-tolerance in Four <i>Microbacterium</i> Species Isolated from Soil Contaminated with Textile Effluent

Authors

  • Department of Life Sciences, The IIS University, Jaipur-302020
  • Department of Life Sciences, The IIS University, Jaipur-302020
  • Department of Life Sciences, The IIS University, Jaipur-302020
  • Department of Life Sciences, The IIS University, Jaipur-302020
  • Department of Life Sciences, The IIS University, Jaipur-302020
  • Division of Pharmacology and Toxicology, Defence Research & Development Establishment, Gwalior - 474 002
  • Division of Pharmacology and Toxicology, Defence Research & Development Establishment, Gwalior - 474 002

Keywords:

Arsenic, bacteria, hyper-tolerance, metal-resistant

Abstract

Arsenic-contaminated areas of Sanganer, Jaipur, Rajasthan, India were surveyed for the presence of metal resistant bacteria contaminated with textile effluent. Samples were collected from soil receiving regular effluent from the textile industries located at Sanganer area. The properties like pH, electrical conductivity, organic carbon, organic matter, exchangeable calcium, water holding capacity and metals like arsenic, iron, magnesium, lead and zinc were estimated in the contaminated soil. In total, nine bacterial strains were isolated which exhibited minimum inhibitory concentration (MIC) of arsenic ranging between 23.09 and 69.2mM. Four out of nine arsenic contaminated soil samples exhibited the presence of arsenite hyper-tolerant bacteria. Four high arsenite tolerant bacteria were characterized by 16S rDNA gene sequencing which revealed their similarity to Microbacterium paraoxydans strain 3109, Microbacterium paraoxydans strain CF36, Microbacterium sp. CQ0110Y, Microbacterium sp. GE1017. The above results were confirmed as per Bergey's Manual of Determinative Bacteriology. All the four Microbacterium strains were found to be resistant to 100μg/ml concentration of cobalt, nickel, zinc, chromium selenium and stannous and also exhibited variable sensitivity to mercury, cadmium, lead and antimony. These results indicate that the arsenic polluted soil harbors arsenite hyper-tolerant bacteria like Microbacterium which might play a role in bioremediation of the soil.

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Published

2018-05-25

How to Cite

Kaushik, P., Rawat, N., Mathur, M., Raghuvanshi, P., Bhatnagar, P., Swarnkar, H., & Flora, S. (2018). Arsenic Hyper-tolerance in Four <i>Microbacterium</i> Species Isolated from Soil Contaminated with Textile Effluent. Toxicology International, 19(2), 188–194. Retrieved from https://www.informaticsjournals.com/index.php/toxi/article/view/21364

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Section

Original Research