Diversity and Dynamics of Microbial Community Structure in Different Mangrove, Marine and Freshwater Sediments During Anaerobic Debromination of PBDEs.
Diversity and Dynamics of Microbial Community Structure in Different Mangrove, Marine and Freshwater Sediments During Anaerobic Debromination of PBDEs.
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PBDEs厌氧脱溴过程中不同红树林、海洋和淡水沉积物中微生物群落结构的多样性和动态
DOI：
10.3389/fmicb.2018.00952
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发表时间：
2018
影响因子：
5.2
通讯作者：
Tam NFY
中科院分区：
文献类型：
--
作者：
Wang YF;Zhu HW;Wang Y;Zhang XL;Tam NFY
多溴联苯醚（PBDEs）脱溴过程中土著微生物群落的多样性和演替规律尚不清楚。本研究利用末端限制性片段长度多态性（T-RFLP）和克隆文库分析，对八个盐碱地（红树林和海洋）和淡水沉积物微生态系统中微生物群落结构的多样性和动态进行了研究，这些微生态系统对沉积物中常见的六溴二苯醚153具有不同的脱溴能力。结果表明，微生物群落结构在盐水和淡水微宇宙之间存在很大差异，可能导致其脱溴能力和途径的明显差异。在主要通过帕拉途径脱溴能力最快的两个红树林微宇宙中，分别检测到了较高相对丰度的Chloroflexi和Delta Proteobacteria，其次是Alphaproteobacteria和Betaproteobacteria; Alphaproteobacteria的优势导致四溴二苯醚的积累较少，而低溴同系物（从二溴二苯醚到四溴二苯醚）的脱溴更完全。与此同时，在效率较低的淡水微生态系统中，微生物群落结构和多溴二苯醚分布的变化相对较小，导致BDE-153的邻位和Meta溴化产物相对较多。巧合的是，其中一个淡水微生态系统在培养结束时显示出绿弯藻和三角变形菌的数量突然增加，这与BDE-153的去除率的增加同步。冗余分析证实了微生物群落结构与多溴二苯醚之间的显着关系（解释总方差的18.7%，P = 0.002）。然而，众所周知的脱氯剂Dehalococcoides的相对丰度与不同微宇宙的脱溴能力没有明显的相关性。这些发现揭示了微生物群落网络在不同盐环境中对PBDE内在脱溴作用增强的重要性。
Little is known about the diversity and succession of indigenous microbial community during debromination of polybrominated diphenyl ethers (PBDEs). This study examined the diversity and dynamics of microbial community structure in eight saline (mangrove and marine) and freshwater sediment microcosms exhibiting different debrominating capabilities for hexa-BDE 153, a common congener in sediments, using terminal restriction fragment length polymorphism (T-RFLP) and clone library analyses. The results showed that microbial community structure greatly differed between the saline and freshwater microcosms, likely leading to distinct variations in their debrominating capabilities and pathways. Higher relative abundances of Chloroflexi and Deltaproteobacteria succeed by Alphaproteobacteria and Betaproteobacteria were detected in the two mangrove microcosms with the fastest debrominating capabilities mainly via para pathway, respectively; the dominance of Alphaproteobacteria resulted in less accumulation of tetra-BDEs and more complete debromination of lower brominated congeners (from di- to tetra-BDEs). Meanwhile, the shifts in both microbial community structure and PBDE profiles were relatively small in the less efficient freshwater microcosms, with relatively more ortho and meta brominated products of BDE-153 resulted. Coincidently, one of the freshwater microcosms showed sudden increases of Chloroflexi and Deltaproteobacteria by the end of incubation, which synchronized with the increase in the removal rate of BDE-153. The significant relationship between microbial community structure and PBDEs was confirmed by redundancy analysis (18.7% of total variance explained, P = 0.002). However, the relative abundance of the well-known dechlorinator Dehalococcoides showed no clear correlation with the debrominating capability across different microcosms. These findings shed light in the significance of microbial community network in different saline environments on enhancement of PBDE intrinsic debromination.
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影响因子：
11.4
作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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