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<p>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 <i>Microglena</i> 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 <i>Microglena</i> 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 <i>Microglena</i> 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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年8月26日

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

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.