Toxic effects of polylactic acid microplastics on photosynthesis and motility of Microglena sp.

文献类型： 外文期刊

第一作者： Li, Yingxia

作者： Li, Yingxia;Xu, Dong;Zhang, Xiaowen;Wang, Yitao;Sun, Ke;Fan, Xiao;Huang, Xintong;Sun, Yanmin;Yang, Fan;Wang, Yapeng;Ye, Naihao

作者机构：

关键词： polylactic acid (PLA); microplastic (MP); Microglena sp.; photosynthethesis; motility

期刊名称：JOURNAL OF OCEANOLOGY AND LIMNOLOGY （ 影响因子：1.3； 五年影响因子：1.5 ）

ISSN： 2096-5508

年卷期： 2025 年

页码：

收录情况： SCI

摘要： Mobility is critical for the survival of flagellated microalgae and plays a key role in maintaining marine ecosystem stability. To assess the environmental risks posed by polylactic acid microplastics (PLA-MPs), we investigated their effects on the photosynthesis and motility of Microglena sp. through indoor and outdoor mesocosm experiments at concentrations of 10, 25, 50, 75, 225, and 375 particles/mL. Results reveal that PLA-MPs inhibited the growth of Microglena sp. in a dose-dependent manner, with a maximum inhibition rate of 44.07% at 375 particles/mL. Additionally, PLA-MPs disrupted photosynthetic activity, chlorophyll biosynthesis, and induced oxidative stress. The swimming velocity and motility patterns of Microglena sp. were also significantly affected. Transcriptomic analysis demonstrated that down-regulation of flagella-related genes contributed to reduced motility, while suppressed photosynthetic gene expression corresponded to decreased photosynthetic efficiency. These findings enhanced our understanding of the adverse effects of PLA-MPs on microalgae and provide valuable insights for evaluating the ecological risks of PLA-MPs in marine ecosystem.

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