Toxic effects of polylactic acid microplastics on photosynthesis and motility of Microglena sp.
文献类型： 外文期刊
作者： Li, Yingxia 1 ; Xu, Dong 2 ; Zhang, Xiaowen 2 ; Wang, Yitao 2 ; Sun, Ke 2 ; Fan, Xiao 2 ; Huang, Xintong 2 ; Sun, Yanmin 2 ; Yang, Fan 2 ; Wang, Yapeng 2 ; Ye, Naihao 2 ;
作者机构： 1.Qingdao Agr Univ, Sch Marine Sci & Engn, Qingdao 266109, Peoples R China
2.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Natl Key Lab Mariculture Biobreeding & Sustainable, Qingdao 266072, Peoples R China
关键词：
polylactic acid (PLA); microplastic (MP);
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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