Ferredoxin-quinone reductase benefits cyclic electron flow around photosystem 1 in tobacco leaves upon exposure to chilling stress under low irradiance

文献类型： 外文期刊

第一作者： Li, X. -G.

作者： Li, X. -G.;Xu, P. -L.;Zhao, J. -P.;Meng, J. -J.;He, Q. -W.

作者机构：

关键词： chlorophyll fluorescence;cyclic electron flow;ferredoxin quinone reductase;Nicotiana;non-photochemical quenching;photosystem 2;xanthophyll cycle

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： 2006 年 44 卷 3 期

页码：

收录情况： SCI

摘要： The function of chloroplast ferredoxin quinone reductase (FQR)-dependent flow was examined by comparing a wild type tobacco and a tobacco transformant (Delta ndhB) in which the ndhB gene had been disrupted with their antimycin A (AA)-fed leaves upon exposure to chilling temperature (4 degrees C) under low irradiance (100 mu mol m(2) s(-1) photon flux density). During the chilling stress, the maximum photochemical efficiency of photosystem (PS) 2 (F-v/F-m) decreased markedly in both the controls and AA-fed leaves, and P700(+) was also lower in AA-fed leaves than in the controls, implying that FQR-dependent cyclic electron flow around PSI functioned to protect the photosynthetic apparatus from chilling stress under low irradiance. Under such stress, non-photochemical quenching (NPQ), particularly the fast relaxing NPQ component (q(f)) and the de-epoxidized ratio of the xanthophyll cycle pigments, (A+Z)/(V+A+Z), formed the difference between AA-fed leaves and controls. The lower NPQ in AA-fed leaves might be related to an inefficient proton gradient across thylakoid membranes (Delta pH) because of inhibiting an FQR-dependent cyclic electron flow around PS1 at chilling temperature under low irradiance.

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