Microbial insights into the biogeochemical features of thallium occurrence: A case study from polluted river sediments
Microbial insights into the biogeochemical features of thallium occurrence: A case study from polluted river sediments
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微生物对铊出现的生物地球化学特征的见解：受污染河流沉积物的案例研究
DOI：
10.1016/j.scitotenv.2020.139957
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发表时间：
2020
影响因子：
9.8
通讯作者：
Wang Lulu
中科院分区：
文献类型：
--
作者：
Wang Jin;She Jingye;Zhou Yuchen;Tsang Daniel C. W.;Beiyuan Jingzi;Xiao Tangfu;Dong Xinjiao;Chen Yongheng;Liu Juan;Tin Meiling;Wang Lulu
铊（Tl）是一种具有极强毒性的微量元素。由于含铊硫化物矿物的开采和冶炼活动的加剧，河流系统中的铊污染日益引起人们的关注。深入了解功能的微生物群落与先进的表征工具是至关重要的了解地球化学循环的Tl。本文采用16S rRNA基因序列分析和鸟枪法宏基因组分析方法，对中国南方某典型含铊硫铁矿区河流沉积物中的微生物群落及其适应性进化策略进行了研究。在所研究的沉积物中，共观察到64门778属的微生物。结果表明，pH、Tl、Pb、Zn和总有机碳（TOC）对微生物群落结构有显著影响。一些重要的还原性微生物（如丹毒丝菌属（Erysipelothrix）、吉伯氏菌属（Geelium）、嗜热嗜热菌属（Acetylfatiferula）、嗜热嗜热杆菌属（Acetylfatihabadium）和梭杆菌属（Fusibacter））参与了铊的生物地球化学循环。Theruv、rec、ars等抗性基因增强了微生物对铊的耐受性。研究表明，相关的C、N、S循环基因是微生物在高铊污染环境中生存的主要代谢途径。研究结果对含铊废水的微生物处理工艺的建立、运行和调控具有重要意义。
Thallium (Tl) is a trace element with extreme toxicity. Widespread Tl pollution in riverine systems, mainly due to escalating mining and smelting activities of Tl-bearing sulfide minerals, has attracted increasing attention. Insights into the function of the microbial communities with advanced characterization tools are critical for understanding the biogeochemical cycle of Tl. Herein, microbial communities and their adaptive evolution strategies in river sediments from a representative Tl-bearing pyrite mine area in southern China were profiled via 16S rRNA gene sequence analysis and shotgun metagenomic analysis. In total, 64 phyla and 778 genera of microorganisms were observed in the studied sediments. The results showed that pH, Tl, Pb, Zn and total organic carbon (TOC) had a significant influence on microbial community structure. Some important reductive microorganisms (such asErysipelothrix,Geobacter,desulfatiferula,desulfatihabadiumandfusibacter) were involved in the biogeochemical cycle of Tl. Theruv,rec,arsand other resistance genes enhanced the tolerance of microorganisms to Tl. The study suggested that relevant C, N and S cycle genes were the main metabolic paths of microorganisms surviving in the high Tl-polluted environment. The findings were critical for establishment, operation and regulation in the microbial treatment of Tl containing or related wastewater.