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Effect of pyrene on denitrification activity and abundance and composition of denitrifying community in an agricultural soil

机译：on对农业土壤反硝化活性及反硝化群落组成和丰度的影响

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摘要

Toxicity of pyrene on the denitrifiers was studied by spiking an agricultural soil with pyrene to a series of concentrations (0-500 mg kg~(-1)) followed by dose-response and dynamic incubation experiments. Results showed a positive correlation between potential denitrification activity and copy numbers of denitrifying functional genes (nirK, nirS and nosZ), and were both negatively correlated with pyrene concentrations. Based on the comparison of EC50 values, denitrifiers harboring nirK, nirS or nosZ gene were more sensitive than denitrification activity, and denitrifiers harboring nrS gene were more sensitive than that harboring nirK or nosZ genes. Seven days after spiking with EC50 concentration of pyrene, denitrifiers diversity decreased and community composition changed in comparison with the control. Phylogenetic analyses of three genes showed that the addition of pyrene increased the proportion of Bradyrhizobiaceae, Rhodospirillales. Burkholderiales and Pseudomonadales. Some species belonging to these groups were reported to be able to degrade PAHs.
机译：通过在农业土壤上掺入一系列浓度的by（0-500 mg kg〜（-1）），然后进行剂量反应和动态温育实验，研究pyr对反硝化器的毒性。结果表明，潜在的反硝化活性与反硝化功能基因（nirK，nirS和nosZ）的拷贝数之间呈正相关，并且与pyr浓度呈负相关。根据EC50值的比较，带有nirK，nirS或nosZ基因的反硝化剂比反硝化活性更敏感，带有nrS基因的反硝化剂比带有nirK或nosZ基因的反硝化剂更敏感。与EC的EC50浓度加标后第7天，反硝化剂多样性降低，群落组成发生变化。对三个基因的系统进化分析表明，pyr的添加增加了缓生根瘤菌科，螺旋藻的比例。 Burkholderiales和假单胞菌。据报道，属于这些类别的某些物种能够降解多环芳烃。

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  • 来源
    《Environmental pollution》 |2011年第7期|p.1886-1895|共10页
  • 作者

    Guang-Xia Guo; Huan Deng; Min Qiao; Yu-Jing Mu; Yong-Guan Zhu;

  • 作者单位

    State Key Lab of Regional and Urban Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    State Key Lab of Regional and Urban Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    State Key Lab of Regional and Urban Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    State Key Lab of Regional and Urban Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    State Key Lab of Regional and Urban Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China,Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    denitrifiers; ec50; phylogenetic analysis; temporal shifts; diversity;

    机译：反硝化剂ec50;系统发育分析;时间变化;多样性;

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