标题：The combined effects of UV-B radiation and herbicides on photosynthesis, antioxidant enzymes and DNA damage in two bloom-forming cyanobacteria
作者：Chen, LZ(Chen, Lanzhou); Xie, M(Xie, Mu); Bi, YH(Bi, Yonghong); Wang, GH(Wang, Gaohong); Deng, SQ(Deng, Songqiang); Liu, YD(Liu, Yongding)
来源出版物：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 卷：80 页：224-230 出版年：JUN 1 2012
摘要：In this study, we investigated the combined effects of UV-B irradiation and herbicides (glyphosate,GPS;2-Methyl-4-chlorophenoxyacetic acid,MCPA-Na; 3-(3,4-dichlorophenyl)-1,1-dimethylurea, DCMU) and the antioxidant (ascorbic acid, ASC) on photosynthesis, antioxidant enzymes and DNA damage in two bloom-forming cyanobacteria, Anabaena sp. and Microcystis viridis. UV-B irradiance increased reactive oxygen species (ROS) production, which decreased chlorophyll a fluorescence yield, pigment content and superoxide dismutase (SOD) activity, and increased malondialdehyde (MDA) content and caused serious DNA damage. The degree of these damages was aggravated by the addition of DCMU, GPS and MCPA, and was partially mitigated by the addition of ASC. During the recovery process, the degree and mechanism in restoring DNA damage and photosynthesis inhibition were different by the removal of UV-B and herbicides (DCMU, GPS and MCPA) in both cyanobacteria. These results suggest that the combination of UV-B and exogenous herbicides have detrimental effects on cyanobacterial metabolism through either a ROS-mediated process or by affecting the electron transport chain, and may cause the shifts in the phytoplankton community.
作者关键词：Bloom-forming cyanobacteria, Herbicides, Repair ability, Toxicity degree, UV-B radiation
扩展关键词：SOLAR ULTRAVIOLET-RADIATION; OXIDATIVE STRESS; CHLOROPHYLL FLUORESCENCE; EXOGENOUS ANTIOXIDANTS; AQUATIC ORGANISMS; SALINITY STRESS; ASCORBIC-ACID; GLYPHOSATE; OXYGEN; NOSTOC
通讯作者地址：Chen, LZ (通讯作者),Wuhan Univ, Hubei Key Lab Biomass Resources Chem & Environman, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China
[Chen, Lanzhou; Xie, Mu; Deng, Songqiang] Wuhan Univ, Hubei Key Lab Biomass Resources Chem & Environman, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China
[Bi, Yonghong; Wang, Gaohong; Liu, Yongding] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
学科类别：Environmental Sciences; Toxicology
