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Microbial Diversity of Chromium-Contaminated Soils and Characterization of Six Chromium-Removing Bacteria

Author

Listed:
  • Zhiguo He

    (Central South University, School of Minerals Processing and Bioengineering
    Central South University, Key Laboratory of Biohydrometallurgy of Ministry of Education)

  • Yuting Hu

    (Central South University, School of Minerals Processing and Bioengineering
    Central South University, Key Laboratory of Biohydrometallurgy of Ministry of Education)

  • Zhen Yin

    (Central South University, School of Minerals Processing and Bioengineering
    Central South University, Key Laboratory of Biohydrometallurgy of Ministry of Education)

  • Yuehua Hu

    (Central South University, School of Minerals Processing and Bioengineering
    Central South University, Key Laboratory of Biohydrometallurgy of Ministry of Education)

  • Hui Zhong

    (Central South University, School of Life Science)

Abstract

Three soil samples obtained from different sites adjacent to a chromium slag heap in a steel alloy factory were taken to examine the effect of chromium contamination on soil bacterial diversity as determined by construction of 16S rDNA clone libraries and sequencing of selected clones based on restriction fragment length polymorphism (RFLP) analysis. Results revealed that Betaproteobacteria, Gammaproteobacteria, Firmicutes, and Alphaproteobacteria occurred in all three soil samples, although the three samples differed in their total diversity. Sample 1 had the highest microbial diversity covering 12 different classes, while Sample 3 had the lowest microbial diversity. Strains of six different species were successfully isolated, one of which was identified as Zobellella denitrificans. To our knowledge, this is the first report of a strain belonging to the genus Zobellella able to resist and reduce chromium. Among all isolates studied, Bacillus odysseyi YH2 exhibited the highest Cr(VI)-reducing capability, with a total removal of 23.5 % of an initial Cr(VI) concentration of 350 mg L−1.

Suggested Citation

  • Zhiguo He & Yuting Hu & Zhen Yin & Yuehua Hu & Hui Zhong, 2016. "Microbial Diversity of Chromium-Contaminated Soils and Characterization of Six Chromium-Removing Bacteria," Environmental Management, Springer, vol. 57(6), pages 1319-1328, June.
    • Handle: RePEc:spr:envman:v:57:y:2016:i:6:d:10.1007_s00267-016-0675-5
    DOI: 10.1007/s00267-016-0675-5
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