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The key microorganisms for anaerobic degradation of pentachlorophenol in paddy soil as revealed by stable isotope probing

文献类型： 外文期刊

作者： Tong, Hui 1 ; Liu, Chengshuai 4 ; Li, Fangbai 1 ; Luo, Chunling 2 ; Chen, Manjia 1 ; Hu, Min 1 ;

作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China

2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China

3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

4.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550009, Peoples R China

关键词： Pentachlorophenol;Stable isotope probing;Archaea

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

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收录情况： SCI

摘要： Pentachlorophenol (PCP) is a common residual persistent pesticide in paddy soil and has resulted in harmful effect on soil ecosystem. The anaerobic microbial transformation of PCP, therefore, has been received much attentions, especially the functional microbial communities for the reductive transformation. However, the key functional microorganisms for PCP mineralization in the paddy soil still remain unknown. In this work, DNA-based stable isotope probing (SIP) was applied to explore the key microorganisms responsible for PCP mineralization in paddy soil. The SIP results indicated that the dominant bacteria responsible for PCP biodegradation belonged to the genus Dechloromonas of the class beta-Proteobacteria. In addition, the increased production of (CH4)-C-13 and (CO2)-C-13 indicated that the addition of lactate enhanced the rate of biodegradation and mineralization of PCP. Two archaea classified as the genera of Methanosaeta and Methanocella of class Methanobacteria were enriched in the heavy fraction when with lactate, whereas no archaea was detected in the absence of lactate. These findings provide direct evidence for the species of bacteria and archaea responsible for anaerobic PCP or its breakdown products mineralization and reveal a new insight into the microorganisms linked with PCP degradation in paddy soil. (C) 2015 Elsevier B.V. All rights reserved.

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