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Cu2+ inhibits photosystem II activities but enhances photosystem I quantum yield of Microcystis aeruginosa
Chunnuan Deng;  Xiangliang Pan;  Shuzhi Wang;  Daoyong Zhang
2014
Source PublicationBiological Trace Element Research
Volume160Issue:2Pages:268-275
Abstract

Responses of photosystem I and II activities of Microcystis aeruginosa to various concentrations of Cu2+ were simultaneously examined using a Dual-PAM-100 fluorometer. Cell growth and contents of chlorophyll a were significantly inhibited by Cu2+. Photosystem II activity [Y(II)] and electron transport [rETRmax(II)] were significantly altered by Cu2+. The quantum yield of photosystem II [Y(II)] decreased by 29 % at 100 μg L−1 Cu2+ compared to control. On the contrary, photosystem I was stable under Cu2+ stress and showed an obvious increase of quantum yield [Y(I)] and electron transport [rETRmax(I)] due to activation of cyclic electron flow (CEF). Yield of cyclic electron flow [Y(CEF)] was enhanced by 17 % at 100 μg L−1 Cu2+ compared to control. The contribution of linear electron flow to photosystem I [Y(II)/Y(I)] decreased with increasing Cu2+ concentration. Yield of cyclic electron flow [Y(CEF)] was negatively correlated with the maximal photosystem II photochemical efficiency (Fv/Fm). In summary, photosystem II was the major target sites of toxicity of Cu2+, while photosystem I activity was enhanced under Cu2+ stress.

KeywordCopper Cyclic Electron Flow Dual-pam-100 Electron Transport Photosystem i
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/11190
Collection环境地球化学国家重点实验室
Affiliation1.Key Lab of Plateau Lake Ecology and Global Change, College of Tourism and Geographic Science, Yunnan Normal University, Kunming 650500, China
2.Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
Recommended Citation
GB/T 7714
Chunnuan Deng;Xiangliang Pan;Shuzhi Wang;Daoyong Zhang. Cu2+ inhibits photosystem II activities but enhances photosystem I quantum yield of Microcystis aeruginosa[J]. Biological Trace Element Research,2014,160(2):268-275.
APA Chunnuan Deng;Xiangliang Pan;Shuzhi Wang;Daoyong Zhang.(2014).Cu2+ inhibits photosystem II activities but enhances photosystem I quantum yield of Microcystis aeruginosa.Biological Trace Element Research,160(2),268-275.
MLA Chunnuan Deng;Xiangliang Pan;Shuzhi Wang;Daoyong Zhang."Cu2+ inhibits photosystem II activities but enhances photosystem I quantum yield of Microcystis aeruginosa".Biological Trace Element Research 160.2(2014):268-275.
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