Repeated release of cerium oxide nanoparticles altered algal responses:Growth,photosynthesis,and photosynthetic gene expression
作者机构：State Key Lab of BiocontrolGuangdong Provincial Key Laboratory of Plant ResourcesSchool of Agriculture and BiotechnologyShenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China College of Ecology and EnvironmentHainan UniversityHaikou 570228China College of Environment and EcologyKey Laboratory of the Three Gorges Reservoir Region's Eco-EnvironmentMinistry of EducationChongqing UniversityChongqing 400045China
出 版 物：《Eco-Environment & Health》 (生态环境与健康（英文）)
年 卷 期：2024年第3卷第3期
页 面：290-299页
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：provided by grants from the National Natural Science Foundation of China(42007285,42077227) Shenzhen Science and Technology Program(Grant Nos.RCBS20210706092344024 and 202206193000001,20220816102553004) Basic and Applied Basic Research Foundation of Guangdong Province(No.2023A1515010564)
主 题：Cerium oxide nanoparticles Environmental risks Repeated exposures Algae Photosynthesis Gene expression level
摘 要：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.
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