摘要
微塑料(Microplastics,MPs)作为一种新型污染物,广泛分布在淡水环境中,对水生生态系统造成极大影响。目前为止,很少有研究评估环境浓度下不同粒径MPs对微藻的影响。本文以4种不同粒径(0.1、1、10、100μm)的聚苯乙烯微塑料(PS-MPs)为材料,研究其对莱茵衣藻生理生化指标的影响。经0.1μm的PS-MPs处理后,试验前期莱茵衣藻的生长得到显著抑制,叶绿素含量降低,但随着暴露时间的增加,抑制作用逐渐减弱。1μm和100μm PS-MPs实验后期显著促进了莱茵衣藻的叶绿素a、叶绿素b的合成以及光合放氧量。10μm PS-MPs在整个暴露阶段对莱茵衣藻的生长和叶绿素合成都没有显著影响。此外,整个暴露阶段,各MPs处理组的超氧化物歧化酶(SOD)和过氧化氢酶(CAT)的含量和活性呈现先增加后降低的趋势。环境浓度的PS-MPs主要通过影响光合和抗氧化系统来干扰藻的生长。
Microplastics(MPs),as a new pollutant,are widely distributed in freshwater environments,posing significant impacts on aquatic ecosystems.However,few studies have evaluated the effects of microplastics of different particle sizes at environmental concentrations on microalgae.This study investigated the effects of polystyrene microplastics(PS-MPs)with four different particle sizes(100 nm,1μm,10μm,and 100μm)on the physiological and biochemical characteristics of Chlamydomonas reinhardtii.The growth of C.reinhardtii was significantly inhibited by 100 nm PS-MPs during the initial exposure period,but the inhibition gradually weakened over time.In contrast,1μm and 100μm PS-MPs significantly enhanced the levels of chlorophyll a,chlorophyll b,and photosynthetic oxygen evolution.The 10μm PS-MPs showed no significant effect on the growth of C.reinhardtii throughout the exposure period.Additionally,the relative expression and activity of superoxide dismutase and catalase in all microplastic-treated groups increased initially and then decreased during the exposure period.PS-MPs at environmental concentrations primarily stimulated algal growth by influencing the photosynthetic and antioxidant systems.
作者
章顺
李珏
李琦晖
郑潇威
樊正球
ZHANG Shun;LI Jue;LI Qihui;ZHENG Xiaowei;FAN Zhengqiu(Department of Environmental Science and Engineering,Fudan University,Shanghai 200433,China;Department of Evolutionary Stress Ecology&Ecotoxicology,KU Leuven,Leuven,3000,Belgium;School of Global Health,Chinese Center for Tropical Diseases Research,School of Medicine,Shanghai Jiao Tong University,Shanghai 200025,China)
出处
《复旦学报(自然科学版)》
北大核心
2025年第5期545-553,共9页
Journal of Fudan University:Natural Science
基金
上海市青年科技英才扬帆计划(23YF1430400)。
关键词
聚苯乙烯微塑料
莱茵衣藻
生物学效应
毒性影响
适应机制
polystyrene microplastics
Chlamydomonas reinhardtii
biological effects
toxic effects
mechanisms of adaptation
