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Effects of cadmium on the activities of photosystems of Chlorella pyrenoidosa and the protective role of cyclic electron flow (vol 93, pg 230, 2013)
Shuzhi Wang;  Daoyong Zhang;  Xiangliang Pan
2013
Source PublicationChemosphere
Volume93Issue:2Pages:230-237
Abstract

Cadmium (Cd) shows high toxicity to aquatic microalgae. Many studies showed that Cd inhibited activities of photosystem II (PSII) but the effects of heavy metals on photosystem I (PSI) and cyclic electron flow (CEF) were still controversial and unclear. The effects of CdCl2 on the activities of PSI, PSII and CEF in Chlorella pyrenoidosa was measured simultaneously in the present study. In presence of 200 μM of Cd, ultrastructure of some cells was strongly modified. Cd exposure led to decrease of the activities of photosynthetic oxygen evolution and respiration. PSII was more sensitive to Cd treatment than PSI. Cd treatment showed significant inhibition on the photochemical quantum yield and electron transport rate of PSII. Cd increased the quantum yield of non-light-induced non-photochemical fluorescence quenching, indicating the damage of PSII. The activity of PSI showed tolerance to Cd treatment with concentration less than 100 μM in the experiment. Linear electron flow (LEF) made significant contribution to the photochemical quantum yield of PSI of the untreated cells, but decreased with increasing Cd concentration. The contribution of CEF to the yield of PSI increased with increasing Cd concentration. The activation of CEF after exposure to Cd played an essential role for the protection of PSI.

KeywordCadmium photosystem I photosystem Ii cyclic Electron Flow chlorella Pyrenoidosa
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9290
Collection环境地球化学国家重点实验室
Affiliation1.Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
Recommended Citation
GB/T 7714
Shuzhi Wang;Daoyong Zhang;Xiangliang Pan. Effects of cadmium on the activities of photosystems of Chlorella pyrenoidosa and the protective role of cyclic electron flow (vol 93, pg 230, 2013)[J]. Chemosphere,2013,93(2):230-237.
APA Shuzhi Wang;Daoyong Zhang;Xiangliang Pan.(2013).Effects of cadmium on the activities of photosystems of Chlorella pyrenoidosa and the protective role of cyclic electron flow (vol 93, pg 230, 2013).Chemosphere,93(2),230-237.
MLA Shuzhi Wang;Daoyong Zhang;Xiangliang Pan."Effects of cadmium on the activities of photosystems of Chlorella pyrenoidosa and the protective role of cyclic electron flow (vol 93, pg 230, 2013)".Chemosphere 93.2(2013):230-237.
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