期刊
ENVIRONMENTAL POLLUTION
卷 247, 期 -, 页码 1064-1070出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.02.013
关键词
Microcystin biodegradation; Enrichment cultures; Anaerobic condition; Bacterial and archaeal diversity
资金
- National Science Foundation of China [51108443, 51478453, 21776163]
- Qilu Youth Talent Programme of Shandong University
Microcystin (MC) elimination is a global challenge that is necessary for the health of humans and ecosystems. Biodegradation of MC, one of the most environmental-friendly methods, had previously been focused on the aerobic condition. In this study, two enrichment cultures from Taihu sediments possessed high capacity for MC-leucine arginine (MC-LR) anaerobic biodegradation. Meanwhile, it was firstly found that MC-LR underwent similar degradation process under anaerobic conditions to that in aerobic condition. Furthermore, a novel degradation pathway, hydrolyzing of Ala-Mdha to form a new linear MC-LR intermediate, was proposed under anaerobic conditions. Combining MC-LR degradation with microbial community analysis, this study deduced that Candidatus Cloacamonas acidaminovorans str. Evry may play an important role in the degradation of MC-LR. These findings suggest an additional pathway involved in the environmental cycle of MC-LR, which implies that the biotransformation of MC-LR might play an important role in eliminating MC-LR in eutrophic lake sediments under anaerobic conditions. (C) 2019 Elsevier Ltd. All rights reserved.
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