Cooperation of xanthophyll cycle with water-water cycle in the protection of photosystems 1 and 2 against inactivation during chilling stress under low irradiance

文献类型： 外文期刊

第一作者： Li, XG

作者： Li, XG;Bi, YP;Zhao, SJ;Meng, QW;Zou, Q;He, QW

作者机构：

关键词： Capsicum; chlorophyll fluorescence; irradiance; temperature

期刊名称：PHOTOSYNTHETICA （ 影响因子：3.189； 五年影响因子：3.38 ）

ISSN： 0300-3604

年卷期： 2005 年 43 卷 2 期

页码：

收录情况： SCI

摘要： The xanthophyll cycle and the water-water cycle had different functional significance in chilling-sensitive sweet pepper upon exposure to chilling temperature (4 degrees C) under low irradiance (100 mu mol m(-2) s(-1)) for 6 It. During chilling stress, effects of non-photochemical quenching (NPQ) on photosystem 2 (PS2) in dithiothreitol (DTT) fed leaves remained distinguishable from that of the water-water cycle in diethyldithiocarbamate (DDTC) fed leaves. In DTT-fed leaves, NPQ decreased greatly accompanied by visible inhibition of the de-epoxidized ratio of the xanthophyll cycle, and maximum photochemical efficiency of PS2 (Fv/F) decreased markedly. Thus the xanthophyll cycle-dependent NPQ could protect PS2 through energy dissipation under chilling stress. However, NPQ had a slighter effect on photosystem I (PSI) in DTT-fed leaves than in DDTC-fed leaves, whereas effects of the water-water cycle on PSI remained distinguishable from that of NPQ. Inhibiting superoxide dismutase (SOD) activity increased the accumulation of O-radical anion (2), the oxidation level of P700 (P700(+)) decreased markedly relative to the control and DTT-fed leaves. Both F-v/F-m and NPQ changed little in DDTC-fed leaves accompanied by little change of (A+Z)/(V+A+Z). This is the active oxygen species inducing PSI photoinhibition in sweet pepper. The water-water cycle can be interrupted easily at chilling temperature. We propose that during chilling stress under low irradiance, the xanthophyll cycle-dependent NPQ has the main function to protect PS2, whereas the water-water cycle is not only the pathway to dissipate energy but also the dominant factor causing PSI chilling-sensitivity in sweet pepper.

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