微塑料
脱卤酶
卤化
脱氯作用
污染物
环境化学
脱卤球绦虫
生物膜
化学
微生物种群生物学
生物转化
微生物
细菌
生物降解
生物
有机化学
氯乙烯
酶
聚合物
共聚物
遗传学
作者
Jinting Liu,Guofang Xu,Siyan Zhao,Chen Chen,Matthew B. Rogers,Jianzhong He
标识
DOI:10.1016/j.jhazmat.2023.130895
摘要
Micro- and nano-plastics are prevalent in diverse ecosystems, but their impacts on biotransformation of organohalide pollutants and underpinning microbial communities remain poorly understood. Here we investigated the influence of micro- and nano-plastics on microbial reductive dehalogenation at strain and community levels. Generally, microplastics including polyethylene (PE), polystyrene (PS), polylactic acid (PLA), and a weathered microplastic mixture increased dehalogenation rate by 10 - 217% in both the Dehalococcoides isolate and enrichment culture, whereas the effects of polyvinyl chloride (PVC) and a defined microplastic mixture depended on their concentrations and cultures. Contrarily, nano-PS (80 nm) consistently inhibited dehalogenation due to increased production of reactive oxygen species. Nevertheless, the enrichment culture showed higher tolerance to nano-PS inhibition, implying crucial roles of non-dehalogenating populations in ameliorating nanoplastic inhibition. The variation in dehalogenation activity was linked to altered organohalide-respiring bacteria (OHRB) growth and reductive dehalogenase (RDase) gene transcription. Moreover, microplastics changed the community structure and benefited the enrichment of OHRB, favoring the proliferation of Dehalogenimonas. More broadly, the assembly of microbial communities on plastic biofilms was more deterministic than that in the planktonic cells, with more complex co-occurrence networks in the former. Collectively, these findings contribute to better understanding the fate of organohalides in changing environments with increasing plastic pollution.
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