The mechanism by which NaCl treatment alleviates PSI photoinhibition under chilling-light treatment

文献类型： 外文期刊

第一作者： Yang Cheng

作者： Yang Cheng;Zhang Zi-shan;Gao Hui-yuan;Fan Xing-li;Liu Mei-jun;Yang Cheng;Li Xiang-dong

作者机构：

关键词： NaCl;PSII;PSI;Photoinhibition;Chilling-light

期刊名称：JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY （ 影响因子：6.252； 五年影响因子：5.375 ）

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年卷期：

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收录情况： SCI

摘要： The effects of chilling-light stress combined with additional stress on PSI and PSII photoinhibition and their interrelationship have not been known. To explore whether NaCl affects the PSI and PSII photoinhibition and their interrelationship under chilling-light treatment, the PSI and PSII activities were studied under chilling-light with or without NaCl treatment. The results showed that the extent of PSI and PSII photoinhibition both increased under chilling-light, while NaCl aggravated PSII photoinhibition and severely damaged cytochrome b(6)/f complex but alleviated PSI photoinhibition. Moreover, DCMU had a similar effect as NaCl in this study, which indicates that NaCl alleviated PSI photoinhibition through reducing electrons transported to PSI. It was also showed that the increased damage to PSII by NaCl did not depend on the inhibition of PSII repair and PSI electron transportation. In conclusion, NaCl alleviated PSI photoinhibition by inhibiting electron transport from PSII under chilling-light conditions. In addition, PSII photoinhibition was not affected by PSI photoinhibition because of a full inhibition of PSII repair by chilling-light treatment. We also speculate that NaCl aggravates PSII photoinhibition by enhancing the damage instead of inhibiting the repair of it under chilling-light conditions. (C) 2014 Elsevier B.V. All rights reserved.

分类号： Q`O6

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