Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, PR China; Yangtze Institute for Conservation and Development, Jiangsu 210098, PR China.
Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, PR China; Yangtze Institute for Conservation and Development, Jiangsu 210098, PR China.
J Hazard Mater. 2022 Feb 15;424(Pt C):127695. doi: 10.1016/j.jhazmat.2021.127695. Epub 2021 Nov 6.
Perfluoroalkyl acids (PFAAs) have emerged as a global concern in aquatic environment remediation due to their abundance, persistence, bioaccumulation, and toxicity. To comprehensively understand the removal potential of multiple PFAAs by submerged macrophytes in aquatic environments, systematic investigations into the tolerance of the typical submerged macrophyte Vallisneria natans to 12 typical PFAAs and the removal capacity to PFAAs in V. natans-microbiota systems were carried out. Results showed that although PFAAs could induce the accumulation of hydrogen peroxide and malondialdehyde, V. natans was overall resistant to multiple PFAAs with natural concentrations. Catalase is one of the main strategies of V. natans to alleviate PFAA stress. Microbiota can remove 18.10-30.84% of the PFAAs from the water column. 24.35-73.45% of PFAAs were removed from water in V. natans-microbiota systems. The uptake of plant tissues and the bioaccumulation of microbiota were proposed as the main removal processes. The removal rates were significantly correlated with the perfluorinated carbon atoms numbers (p < 0.05). PFAAs and V. natans increased the relative abundance of Betaproteobacteria, Nostocales, Microscillaceae, Sphingobacteriales, SBR1031, Chlamydiales, Phycisphaerae, Caldilineales, Rhodobacterales, and Verrucomicrobiales. The present study suggested that V. natans can be a potential species to remove multiple PFAAs in aquatic environments, and further providing insights into the PFAAs' remediation.
全氟烷基酸（PFAAs）在水生环境修复中因其丰富度、持久性、生物蓄积性和毒性而成为一个全球性关注的问题。为了全面了解水生环境中淹没植物对多种 PFAAs 的去除潜力，系统研究了典型淹没植物苦草对 12 种典型 PFAAs 的耐受性及其在苦草-微生物系统中对 PFAAs 的去除能力。结果表明，尽管 PFAAs 可以诱导过氧化氢和丙二醛的积累，但苦草总体上能耐受多种天然浓度的 PFAAs。过氧化氢酶是苦草缓解 PFAA 胁迫的主要策略之一。微生物群可以从水柱中去除 18.10-30.84%的 PFAAs。在苦草-微生物系统中，有 24.35-73.45%的 PFAAs 从水中被去除。植物组织的吸收和微生物群的生物累积被认为是主要的去除过程。去除率与全氟碳原子数显著相关（p<0.05）。PFAAs 和苦草增加了β变形菌纲、念珠藻目、微丝菌科、鞘脂杆菌目、SBR1031、衣原体目、Phycisphaerae、Caldilineales、红杆菌目和疣微菌目的相对丰度。本研究表明，苦草可以作为一种潜在的物种，用于去除水生环境中的多种 PFAAs，并进一步为 PFAAs 的修复提供了思路。
