Wang Xu, Wang Guoguang, Li Chuanyuan, Liu Yu, Jiang Na, Dong Xu, Wang Haixia
College of Environmental Science and Engineering, Dalian Maritime University, No. 1 Linghai Road, Dalian 116026, PR China.
College of Environmental Science and Engineering, Dalian Maritime University, No. 1 Linghai Road, Dalian 116026, PR China.
Mar Pollut Bull. 2023 Mar;188:114622. doi: 10.1016/j.marpolbul.2023.114622. Epub 2023 Jan 24.
As the widely used flame retardant, polybrominated diphenyl ethers (PBDEs) have been ubiquitously detected in wetland sediments. Microbial degradation is the importantly natural attenuation process for PBDEs in sediments. In this study, the microbial degradation of PBDEs and inherent alternation of microbial communities were explored in anaerobic sediments from coastal wetland, North China. BDE-47 and BDE-153 could be degraded by the indigenous microbes, with biodegradation following pseudo-first-order kinetic. In sediments, the major genera for BDE-47 and BDE-153 degradation were Paeisporosarcina and Gp7, respectively, in single exposure. However, Marinobacter was dominant genera in the combined exposure to BDE-47 and BDE-153, and competition against Marinobacter existed between BDE-47 and BDE-153 degradation. Analysis of bacterial metabolic function indicated that membrane transport, amino acid and carbohydrate metabolism were included in degradation. This study provides the systematic characterization of the sediment microbial community structure and function associated anaerobic microbial degradation of PBDEs in coastal wetland.
作为广泛使用的阻燃剂，多溴二苯醚（PBDEs）已在湿地沉积物中被广泛检测到。微生物降解是沉积物中PBDEs重要的自然衰减过程。本研究对中国北方沿海湿地厌氧沉积物中PBDEs的微生物降解及微生物群落的内在变化进行了探索。BDE - 47和BDE - 153可被本地微生物降解，生物降解遵循准一级动力学。在沉积物中，单次暴露时，降解BDE - 47和BDE - 153的主要菌属分别为类芽孢八叠球菌属和Gp7。然而，在BDE - 47和BDE - 153联合暴露时，海杆菌属是优势菌属，且BDE - 47和BDE - 153的降解之间存在对海杆菌属的竞争。细菌代谢功能分析表明，降解过程涉及膜转运、氨基酸和碳水化合物代谢。本研究系统地阐述了沿海湿地沉积物微生物群落结构和功能与PBDEs厌氧微生物降解之间的关系。
