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Excess Ca2+ does not alleviate but increases the toxicity of Hg2+ to photosystem II in Synechocystis sp. (Cyanophyta)
Daoyong Zhang;  Chunnuan Deng;  Xiangliang Pan
2013
发表期刊Ecotoxicology and Environmental Safety
卷号97页码:160-165
摘要

This study demonstrated that excess Ca2+ increased the toxicity of Hg2+ to PSII of cyanobacterium Synechocystis sp. using fast rise chlorophyll fluorescence test. Excess Ca2+ increased the inhibitory effect of Hg2+ on O2 evolution. Exposure to Hg2+ caused increase in functional antenna size (ABS/RC), trapping rate of reaction center (TR0/RC), dissipated energy flux per reaction center (DI0/RC) and maximum quantum yield of non-photochemical deexcitation (φDo), indicating that some reaction centers were transformed to dissipation sinks under Hg2+ stress. Hg2+ stress slowed down electron transport on both donor side and acceptor side and caused accumulation of P680+. Excess Ca2+ intensified all the Hg2+ toxic effects on PSII function and led to dysfunction of PSII. The number of reaction centers that were transformed into dissipation sinks increased with increasing Ca2+ concentration.

关键词Calcium Chlorophyll Fluorescence Mercury Photosystem Ii Toxicity
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/42920512-1/11040
专题环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, China
2.Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
3.Key Laboratory of Plateau Lake Ecology and Global Change, College of Tourism and Geographic Science, Yunnan Normal University, Kunming 650500, China
推荐引用方式
GB/T 7714
Daoyong Zhang;Chunnuan Deng;Xiangliang Pan. Excess Ca2+ does not alleviate but increases the toxicity of Hg2+ to photosystem II in Synechocystis sp. (Cyanophyta)[J]. Ecotoxicology and Environmental Safety,2013,97:160-165.
APA Daoyong Zhang;Chunnuan Deng;Xiangliang Pan.(2013).Excess Ca2+ does not alleviate but increases the toxicity of Hg2+ to photosystem II in Synechocystis sp. (Cyanophyta).Ecotoxicology and Environmental Safety,97,160-165.
MLA Daoyong Zhang;Chunnuan Deng;Xiangliang Pan."Excess Ca2+ does not alleviate but increases the toxicity of Hg2+ to photosystem II in Synechocystis sp. (Cyanophyta)".Ecotoxicology and Environmental Safety 97(2013):160-165.
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