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首页> 外文期刊>Environmental Science & Technology >Responses of Aromatic-Degrading Microbial Communities to Elevated Nitrate in Sediments
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Responses of Aromatic-Degrading Microbial Communities to Elevated Nitrate in Sediments

机译：降解土壤的微生物群落对沉积物中硝酸盐升高的响应

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A high number of aromatic compounds that have been released into aquatic ecosystems have accumulated in sediment because of their low solubility and high hydrophobicity, causing significant hazards to the environment and human health. Since nitrate is an essential nitrogen component and a more thermodynamically favorable electron acceptor for anaerobic respiration, nitrate-based bioremediation has been applied to aromatic-contaminated sediments. However, few studies have focused on the response of aromatic-degrading microbial communities to nitrate addition in anaerobic sediments. Here we hypothesized that high nitrate inputs would stimulate aromatic-degrading microbial communities and their associated degrading processes, thus increasing the bioremediation efficiency in aromatic compound-contaminated sediments. We analyzed the changes of key aromatic-degrading genes in the sediment samples from a field-scale site for in situ bioremediation of an aromatic-contaminated creek in the Pearl River Delta before and after nitrate injection using a functional gene array. Our results showed that the genes involved in the degradation of several kinds of aromatic compounds were significantly enriched after nitrate injection, especially those encoding enzymes for central catabolic pathways of aromatic compound degradation, and most of the enriched genes were derived from nitrate-reducing microorganisms, possibly accelerating bioremediation of aromatic-contaminated sediments. The sediment nitrate concentration was found to be the predominant factor shaping the aromatic-degrading microbial communities. This study provides new insights into our understanding of the influences of nitrate addition on aromatic-degrading microbial communities in sediments.
机译：由于其低溶解度和高疏水性，已经释放到水生生态系统中的大量芳香化合物已在沉积物中积累，对环境和人类健康造成重大危害。由于硝酸盐是厌氧呼吸中必不可少的氮成分和热力学上更有利的电子受体，因此基于硝酸盐的生物修复技术已被芳香污染的沉积物所采用。然而，很少有研究集中于降解芳香族的微生物群落对厌氧沉积物中硝酸盐添加的响应。在这里，我们假设高的硝酸盐输入量会刺激芳香族降解微生物群落及其相关的降解过程，从而提高了芳香族化合物污染沉积物中的生物修复效率。我们使用功能基因阵列分析了硝酸盐注入前后在珠江三角洲被芳香污染的小河进行原位生物修复的现场规模的沉积物样品中关键芳香降解基因的变化。我们的研究结果表明，硝酸盐注射后，与多种芳香化合物降解有关的基因显着富集，尤其是编码芳香化合物降解的中央分解代谢途径的酶的编码基因，并且大部分富集的基因均来自还原硝酸盐的微生物，可能会加速芳香族沉积物的生物修复。发现沉积物中的硝酸盐浓度是影响降解芳香族微生物群落的主要因素。这项研究为我们了解硝酸盐添加对沉积物中芳香降解微生物群落的影响提供了新的见解。

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  • 来源
    《Environmental Science & Technology》 |2015年第20期|12422-12431|共10页
  • 作者

    Meiying Xu; Zhili He; Qin Zhang; Jin Liu; Jun Guo; Guoping Sun; Jizhong Zhou;

  • 作者单位

    Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou 510070, China,State Key Laboratory of Applied Microbiology Southern China, Guangzhou 510070, China;

    Institute for Environmental Genomics and Department of Microbiology and Plant Biology, University of Oklahoma, Norman, Oklahoma 73019, United States;

    Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou 510070, China;

    Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou 510070, China;

    Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou 510070, China,State Key Laboratory of Applied Microbiology Southern China, Guangzhou 510070, China;

    Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou 510070, China,State Key Laboratory of Applied Microbiology Southern China, Guangzhou 510070, China;

    Institute for Environmental Genomics and Department of Microbiology and Plant Biology, University of Oklahoma, Norman, Oklahoma 73019, United States,Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States,State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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