Biotechnology Bulletin ›› 2016, Vol. 32 ›› Issue (12): 137-142.

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Isolation,Identification and Heavy Metal-resistance Characteristics of a Zn-resistant Bacterium,Pseudochrobactrum sp. ZS2

QU jia1,ZHAO Ling-xia1,SHEN Ne-min2,SUN Xiao-yu1,CHEN Rui1,LU Peng-peng1,QIAO Xue-li3,SHEN Wei-rong1   

  1. 1. Microbial Resource Center,Microbiology Insititute of Shaanxi,Xi’an 710043;
    2. Xi’an Center for Disease Control and Prevention,Xi’an 710043;
    3. College of Environmental & Chemistry Engineering,Xi’an Polytechnic University,Xi’an 710048
  • Received:2016-03-29 Online:2016-12-25 Published:2016-12-07

Abstract: Screening of resistant bacterium is beneficial to degradation of heavy metal and bioremediation of soil. A zinc-resistant strain,named ZS2,was isolated from metal-polluted soil in a lead-zinc mining area in Shangluo,Shaanxi province and identified as Pseudochrobactrum asaccharolyticum based on the analysis of its physical and biochemical characteristics and its 16S rRNA gene sequence. Studying the resistance of heavy metals and Zn2+adsorption,the results showed that ZS2 has high Zinc-resistance and maximum tolerable is 20 mmol/L. The ZS2 also could grow in a variety of single and combined heavy metals(Pb2+、Cu2+、Cr6+、Cd2+)and have obvious removal effects of low Zn2+ concentration. When the concentrations of zinc was 2.0 mmol/L,the removal efficiency could reach 55.25%. The results indicated that ZS2 is a rare strain with heavy metal resistance from Pseudochrobactrum genus and have excellent application value to remediate heavy metal contaminated soil.

Key words: zinc-resistant bacterium, heavy metals-resistance, identification, biosorption

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