期刊
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
卷 1817, 期 8, 页码 1374-1379出版社
ELSEVIER
DOI: 10.1016/j.bbabio.2012.03.010
关键词
Cold stress; Electron transport; Lipid unsaturation; Phosphatidylglycerol; Photoinhibition; Photosystem I
资金
- Russian Foundation for Basic Research [11-04-01389a, 11-04-92690a, 12-04-92101a]
- Russian Ministry of Science and Education [16.740.11.0176]
- Russian Academy of Sciences
- Natural Sciences and Engineering Research Council of Canada
Leaves of transgenic tobacco plants with decreased levels of fatty acid unsaturation in phosphatidylglycerol (PG) exhibited a slightly lower level of the steady state oxidation of the photosystem I (PSI) reaction center P700 (P700(+)) than wild-type plants. The PSI photochemistry of wild-type plants was only marginally affected by high light treatments. Surprisingly, all plants of transgenic lines exhibited much higher susceptibility to photoinhibition of PSI than wild-type plants. This was accompanied by a 2.5-fold faster re-reduction rate of P700(+) in the dark, indicating a higher capacity for cyclic electron flow around PSI in high light treated transgenic leaves. This was associated with a much higher intersystem electron pool size suggesting over-reduction of the PQ pool in tobacco transgenic lines with altered PG unsaturation compared to wild-type plants. The physiological role of PG unsaturation in PSI down-regulation and modulation of the capacity of PSI-dependent cyclic electron flows and distribution of excitation light energy in tobacco plants under photoinhibitory conditions at low temperatures is discussed. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: from Natural to Artificial. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据