Differences in the uptake and translocation of differentially charged microplastics by the taproot and lateral root of mangroves

文献类型： 外文期刊

第一作者： Lin, Yichun

作者： Lin, Yichun;Wang, Luya;Lin, Bigui;Liu, Beibei;Guan, Tingting;Li, Qinfen;Wei, Chaoxian;Wang, Luya;Li, Qinfen;Wei, Chaoxian;Lin, Bigui;Li, Qinfen;Wei, Chaoxian;Liu, Beibei;Li, Qinfen;Wei, Chaoxian;Guo, Shuai

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关键词： Microplastics; Mangrove taproots; Mangrove lateral roots; Uptake and translocation; Foliar emission

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：8.2； 五年影响因子：8.6 ）

ISSN： 0048-9697

年卷期： 2024 年 945 卷

页码：

收录情况： SCI

摘要： The interception of microplastics (MPs) by mangrove roots plays an indispensable role in reducing the environmental risks of MPs. However, there remains limited research on the fate of the intercepted MPs. Hereby, the uptake and subsequent translocation of 0.2 mu m and 2 mu m PS MPs with different coating charge by the typical saltsecreting mangrove plants ( Aegiceras corniculatum ) were investigated. Compared to amino-functionalized PS with positive charge (PS-NH 2 ), the visualized results indicated that the efficient uptake of carboxy-functionalized PS with negative charge (PS-COOH) was more dependent on taproots. But for the lateral roots, it only allowed the entry of PS-NH 2 instead of PS-COOH. The specific uptake pathways of PS-NH 2 on the lateral roots could attribute to the release of H + and organic acids by root hairs, as well as the relative higher Zeta potential. After entering the Aegiceras corniculatum roots, the translocation of PS MPs was restricted by their particle sizes. Furthermore, the release of PS MPs from Aegiceras corniculatum leaf surfaces through the salt glands and stomata was observed. And the decline in the photochemical efficiency of leaves under PS MPs exposure also indirectly proved the foliar emission of PS MPs. Our study improved the understanding of the environmental behaviors and risks of the retained MPs in mangroves.

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