Calcium contributes to photoprotection and repair of photosystem II in peanut leaves during heat and high irradiance

文献类型： 外文期刊

第一作者： Yang, Sha

作者： Yang, Sha;Wang, Fang;Guo, Feng;Meng, Jing-Jing;Li, Xin-Guo;Yang, Sha;Guo, Feng;Meng, Jing-Jing;Li, Xin-Guo;Wan, Shu-Bo;Wang, Fang

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关键词： Calcium; D1 protein; heat and high irradiance stress; peanut; photosystem II

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）

ISSN： 1672-9072

年卷期： 2015 年 57 卷 5 期

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收录情况： SCI

摘要： In this study, we investigated the effects of exogenous calcium nitrate on photoinhibition and thylakoid protein level in peanut plants under heat (40 degrees C) and high irradiance (HI) (1,200 mu mol/m(2) per s) stress. Compared with control seedlings (cultivated in 0mmol/L Ca(NO3)(2) medium), the maximal photochemical efficiency of photosystem II (PSII) in Ca2+-treated plants showed a slight decrease after 5h stress, accompanied by lower degree of PSII closure (1-qP), higher non-photochemical quenching, and lower level of membrane damage. Ca2+ inhibitors were used to analyze the varieties of antioxidant enzymes activity and PSII proteins. These results indicated that Ca2+ could protect the subunits of PSII reaction centers from photoinhibition by reducing the generation of reactive oxygen species. In the presence of both ethyleneglycol-bis(2-aminoethylether)-tetraacetic acid and ascorbic acid (AsA), the net degradation of the damaged D1 protein was faster than that only treated with AsA. Our previous study showed that either the transcriptional or the translational level of calmodulin was obviously higher in Ca2+-treated plants. These results suggested that, under heat and HI stress, the Ca2+ signal transduction pathway can alleviate the photoinhibition through regulating the protein repair process besides an enhanced capacity for scavenging reactive oxygen species.

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