Novel biological aqua crust enhances in situ metal(loid) bioremediation driven by phototrophic/diazotrophic biofilm

文献类型： 外文期刊

第一作者： Wang, Guobao

作者： Wang, Guobao;Feng, Zekai;Chen, Chiyu;Chen, Daijie;Wu, Bo;Jiang, Yuanyuan;Yu, Hang;Chao, Yuanqing;Tang, Yetao;Qiu, Rongliang;Wang, Shizhong;Wang, Guobao;Wu, Bo;Chao, Yuanqing;Tang, Yetao;Qiu, Rongliang;Wang, Shizhong;Yin, Xiuran;Liu, Chong;Morel, Jean Louis;He, Huan;Qiu, Rongliang

作者机构：

关键词： Biological aqua crust; Metal(loid) bioremediation; Metagenomics; Biofilm formation

期刊名称：MICROBIOME （ 影响因子：15.5； 五年影响因子：19.4 ）

ISSN： 2049-2618

年卷期： 2023 年 11 卷 1 期

页码：

收录情况： SCI

摘要： Background Understanding the ecological and environmental functions of phototrophic biofilms in the biological crust is crucial for improving metal(loid) (e.g. Cd, As) bioremediation in mining ecosystems. In this study, in combination with metal(loid) monitoring and metagenomic analysis, we systematically evaluated the effect of biofilm in a novel biological aqua crust (biogenic aqua crust-BAC) on in situ metal(loid) bioremediation of a representative Pb/Zn tailing pond.Results We observed strong accumulation of potentially bioavailable metal(loid)s and visible phototrophic biofilms in the BAC. Furthermore, dominating taxa Leptolyngbyaceae (10.2-10.4%, Cyanobacteria) and Cytophagales (12.3-22.1%, Bacteroidota) were enriched in biofilm. Along with predominant heterotrophs (e.g. Cytophagales sp.) as well as diazotrophs (e.g. Hyphomonadaceae sp.), autotrophs/diazotrophs (e.g. Leptolyngbyaceae sp.) in phototrophic biofilm enriched the genes encoding extracellular peptidase (e.g. family S9, S1), CAZymes (e.g. CBM50, GT2) and biofilm formation (e.g. OmpR, CRP and LuxS), thus enhancing the capacity of nutrient accumulation and metal(loid) bioremediation in BAC system.Conclusions Our study demonstrated that a phototrophic/diazotrophic biofilm constitutes the structured communities containing specific autotrophs (e.g. Leptolyngbyaceae sp.) and heterotrophs (e.g. Cytophagales sp.), which effectively control metal(loid) and nutrient input using solar energy in aquatic environments. Elucidation of the mechanisms of biofilm formation coupled with metal(loid) immobilization in BAC expands the fundamental understanding of the geochemical fate of metal(loid)s, which may be harnessed to enhance in situ metal(loid) bioremediation in the aquatic ecosystem of the mining area.

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