中国湖南受砷污染土壤中分离的假单胞菌 HN-2 对砷的氧化还原转化。
Arsenic redox transformation by Pseudomonas sp. HN-2 isolated from arsenic-contaminated soil in Hunan, China.
机构信息
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China; Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China; Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
出版信息
J Environ Sci (China). 2016 Sep;47:165-173. doi: 10.1016/j.jes.2015.11.036. Epub 2016 Apr 8.
A mesophilic, Gram-negative, arsenite[As(III)]-oxidizing and arsenate[As(V)]-reducing bacterial strain, Pseudomonas sp. HN-2, was isolated from an As-contaminated soil. Phylogenetic analysis based on 16S rRNA gene sequencing indicated that the strain was closely related to Pseudomonas stutzeri. Under aerobic conditions, this strain oxidized 92.0% (61.4μmol/L) of arsenite to arsenate within 3hr of incubation. Reduction of As(V) to As(III) occurred in anoxic conditions. Pseudomonas sp. HN-2 is among the first soil bacteria shown to be capable of both aerobic As(III) oxidation and anoxic As(V) reduction. The strain, as an efficient As(III) oxidizer and As(V) reducer in Pseudomonas, has the potential to impact arsenic mobility in both anoxic and aerobic environments, and has potential application in As remediation processes.
一株嗜温、革兰氏阴性、亚砷酸盐[As(III)]氧化和砷酸盐[As(V)]还原的细菌菌株 Pseudomonas sp. HN-2 从受砷污染的土壤中分离得到。基于 16S rRNA 基因测序的系统发育分析表明，该菌株与恶臭假单胞菌（Pseudomonas stutzeri）密切相关。在有氧条件下，该菌株在 3 小时的孵育时间内将 92.0%（61.4μmol/L）的亚砷酸盐氧化为砷酸盐。在缺氧条件下会发生砷酸盐（As(V)）还原为亚砷酸盐（As(III)）。Pseudomonas sp. HN-2 是首批被证明能够同时进行好氧亚砷酸盐（As(III)）氧化和缺氧砷酸盐（As(V)）还原的土壤细菌之一。该菌株作为 Pseudomonas 中有效的亚砷酸盐（As(III)）氧化剂和砷酸盐（As(V)）还原剂，有可能影响缺氧和有氧环境中的砷迁移，在砷修复过程中有潜在的应用。
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