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Toxic effects of mercury on PSI and PSII activities, membrane potential and transthylakoid proton gradient in Microsorium pteropus
Chunnuan Deng; Daoyong Zhang; Xiangliang Pan; Fengqin Chang; Shuzhi Wang
2013
发表期刊Journal of Photochemistry and Photobiology B: Biology
卷号127页码:1-7
摘要

Mercury (Hg) is one of the top toxic metals in environment and it poses a great risk to organisms. This study aimed to elucidate the toxic effects of Hg2+ on energy conversion of photosystem I (PSI) and photosystem II (PSII), membrane potential and proton gradient of Microsorium pteropus (an aquatic plant species). Contents of chlorophyll a, chlorophyll b and carotenoids, quantum yield and electron transfer of PSI and PSII of M. pteropus exposed to various concentrations of Hg2+ were measured. With increasing Hg2+ concentration, quantum yield and electron transport of PSI [Y(I) and ETR(I)] and PSII [Y(II) and ETR(II)] decreased whereas limitation of donor side of PSI [Y(ND)] increased. At ⩾165 μg L−1 Hg2+, quantum yield of non-light-induced non-photochemical fluorescence quenching in PSII [Y(NO)] significantly increased but quantum yield of light-induced non-photochemical fluorescence quenching [Y(NPQ)] decreased. Membrane potential (Δψ) and proton gradient (ΔpH) of M. pteropus were reduced significantly at 330 μg L−1 Hg2+ compared to control. Mercury exposure affected multiple sites in PSII and PSI of M. pteropus.

关键词Photosystem I mercury membrane Potential proton Gradient aquatic Plant
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/9435
专题环境地球化学国家重点实验室
作者单位1.Key Lab of Plateau Lake Ecology & Global Change, College of Tourism and Geographic Science, Yunnan Provincial Key Laboratory of Plateau Geographical Process and Environmental Change, 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.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
4.University of Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式
GB/T 7714
Chunnuan Deng,Daoyong Zhang,Xiangliang Pan,et al. Toxic effects of mercury on PSI and PSII activities, membrane potential and transthylakoid proton gradient in Microsorium pteropus[J]. Journal of Photochemistry and Photobiology B: Biology,2013,127:1-7.
APA Chunnuan Deng,Daoyong Zhang,Xiangliang Pan,Fengqin Chang,&Shuzhi Wang.(2013).Toxic effects of mercury on PSI and PSII activities, membrane potential and transthylakoid proton gradient in Microsorium pteropus.Journal of Photochemistry and Photobiology B: Biology,127,1-7.
MLA Chunnuan Deng,et al."Toxic effects of mercury on PSI and PSII activities, membrane potential and transthylakoid proton gradient in Microsorium pteropus".Journal of Photochemistry and Photobiology B: Biology 127(2013):1-7.
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