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repeated release of cerium oxide nanoparticles altered algal responses:Growth,photosynthesis,and photosynthetic gene expression

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Eco-Environment & Health 2024年第3期3卷 290-299页

作者： Saibo Liu Jingheng Han Xiaowu Ma Xiaoshan Zhu Han Qu Guorong Xin Xiaochen Huang State Key Lab of Biocontrol Guangdong Provincial Key Laboratory of Plant ResourcesSchool of Agriculture and BiotechnologyShenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China College of Ecology and Environment Hainan UniversityHaikou 570228China College of Environment and Ecology Key Laboratory of the Three Gorges Reservoir Region's Eco-EnvironmentMinistry of EducationChongqing UniversityChongqing 400045China

The expanding production of engineered nanomaterials(ENMs)can eventually cause their increased release into and presence in aquatic ecosystems,potentially threatening the health of aquatic organisms and the stability of the ecological ***,ENMs are repeatedly released into real-world aquatic environments in relatively low concentrations,potentially affecting photosynthesis in primary producers such as ***,knowledge regarding the effects of repeated exposure to ENMs on algal photosynthesis is still ***,the physiological responses of the freshwater algae Chlorella vulgaris following single and repeated exposures to cerium oxide nanoparticles(CeO2 NPs)were investigated at 10 mg/L,with a focus on *** results showed that repeated exposures triggered increased photosynthetic pigment contents,oxidative stress levels,decreased photosynthetic performance,and lower biomass in *** compared to a single ***-related genes(i.e.,petA,petB,psaA,atpB,and rbcL)were found to be upregulated following repeated *** for petB,repeated rather than single exposure treatment significantly upregulated its expression levels by 2.92–10.24-fold compared to unexposed ***,increased exposure times could aggravate the interaction between CeO2 NPs and algae,elevating 8.13%,12.13%,and 20.51%Ce distribution on the algal cell surface or intracellularly,compared to a single *** study is the first to investigate the effects of ENM exposure times on algal photosynthesis,providing new insights into the assessment of the risks these materials pose to real-world aquatic environments.

关键词： Cerium oxide nanoparticles Environmental risks repeated exposures Algae Photosynthesis Gene expression level

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