Cable bacteria accelerate the anaerobic removal of pyrene in black odorous river sediments
Cable bacteria accelerate the anaerobic removal of pyrene in black odorous river sediments
复制标题
电缆细菌加速黑臭河流沉积物中芘的厌氧去除
DOI：
10.1016/j.jhazmat.2022.130305
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发表时间：
2022-11-07
影响因子：
13.6
通讯作者：
Xu, Meiying
中科院分区：
文献类型：
--
作者：
Huang, Youda;Hu, Wenzhe;Xu, Meiying
电缆细菌通过长距离电子传递（LDET）在沉积物的地球化学过程中发挥着重要作用。已发现电缆细菌和有机污染物去除之间的潜在关系;然而，其机制仍不清楚。在这项研究中，电缆细菌对芘的反应进行了研究，在有和没有芘的沉积物中，电缆细菌对芘的去除效果进行了探索，通过连接和阻断电缆细菌的路径，以低氧区。结果表明，芘对电缆微生物群落结构和电缆细菌组成有显著影响。芘的去除率随着电缆菌的富集而显著提高，而硫还原微生物和芳香族化合物降解菌也显著富集，且与电缆菌丰度相关。宏基因组分析表明，电缆细菌有一个潜在的LDET结合乙酸/甲酸呼吸途径，以获得能量。芘的存在可能选择和富集了对有机污染物具有高耐受性的电缆细菌，并改变了相关的功能微生物群落，导致芘去除的加速。该研究为阐明电缆菌与污染物的相互作用机制提供了新的思路，为电缆菌在沉积物污染物生物修复中的应用提供了新的思路。
Cable bacteria play an essential role in biogeochemical processes in sediments by long-distance electron trans-port (LDET). A potential relationship has been found between cable bacteria and organic contaminant removal; however, the mechanisms remain unclear. In this study, the response of cable bacteria to pyrene was investigated in sediments with and without pyrene, and the effect of cable bacteria on pyrene removal was explored by connecting and blocking the paths of cable bacteria to the suboxic zones. The results showed that pyrene significantly influenced the microbial community structure and the composition of cable bacteria. The pyrene removal efficiencies significantly increased with the enrichment of cable bacteria, while sulfur-reducing mi-croorganisms and aromatic compound degraders were also significantly enriched and correlated with cable bacteria abundance. Metagenomic analysis showed that cable bacteria have a potential LDET-bound acetate/ formate respiratory pathway to gain energy. The presence of pyrene probably selects and enriches cable bacteria with a high tolerance to organic contaminants and changes the related functional microbial community, leading to the acceleration of pyrene removal. This study provides new insights into the interaction mechanisms between contaminants and cable bacteria, shedding light on the applications of cable bacteria in the bioremediation of contaminants in sediments.