Contribution of the Alternative Respiratory Pathway to PSII Photoprotection in C3 and C4 Plants
Contribution of the Alternative Respiratory Pathway to PSII Photoprotection in C3 and C4 Plants作者机构：State Key Laboratory of Crop Biology ColLege of Life Sciences College of Horticulture Science and Engineering Shandong Agricultural University Tai'an-271018 China Department of Plant Physiology FB5 University of Osnabrueck 49069 Osnabrueck Germany National and Local Joint Engineering Laboratory of Ecological Mariculture Institute of Oceanology Chinese Academy of Sciences 7 Nanhai Road Qingdao 266071 China Wheat Research Institute Henan Academy of Agricultural Sciences Zhengzhou Henan 450002 China These authors contributed equally te this article.
出 版 物：《Molecular Plant》 (分子植物（英文版）)
年 卷 期：2017年第10卷第1期
页 面：131-142页
核心收录：
学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学] 0901[农学-作物学] 0902[农学-园艺学]
基 金：国家973计划 国家自然科学基金 supported by the China Postdoctoral Science Foundation
主 题：alternative oxidase photoprotection photosystem II photorespiration C3 plant C4 plant
摘 要：The mechanism by which the mitochondrial alternative oxidase （AOX） pathway contributes to photosystem II （PSII） photoprotection is in dispute. It was generally thought that the AOX pathway protects photosystems by dissipating excess reducing equivalents exported from chloroplasts through the malate/oxaloacetate （Mal/OAA） shuttle and thus preventing the over-reduction of chloroplasts. In this study, using the aoxla Arabidopsis mutant and nine other C3 and C4 plant species, we revealed an additional action model of the AOX pathway in PSII photoprotection. Although the AOX pathway contributes to PSII photoprotection in C3 leaves treated with high light, this contribution was observed to disappear when photorespiration was suppressed. Disruption or inhibition of the AOX pathway significantly decreased the photorespiration in C3 leaves. Moreover, the AOX pathway did not respond to high light and contributed little to PSII photoprotection in C4 leaves possessing a highly active Mal/OAA shuttle but with little photorespiration. These results demonstrate that the AOX pathway contributes to PSII photoprotection in C3 plants by maintaining photo- respiration to detoxify glycolate and via the indirect export of excess reducing equivalents from chloro-plasts by the MaI/OAA shuttle. This new action model explains why the AOX pathway does not contribute to PSII photoprotection in C4 plants.
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