Mitochondrial alternative oxidase pathway acts as an electron sink during photosynthetic induction in Rumex K-1 leaves

doi:10.32615/ps.2021.047

IOCAS-IR

	Mitochondrial alternative oxidase pathway acts as an electron sink during photosynthetic induction in Rumex K-1 leaves
	Cheng, D. D.1; Zhang, L. T.2
	2021
发表期刊	PHOTOSYNTHETICA
ISSN	0300-3604
卷号	59 期号:4 页码:615-624
通讯作者	Zhang, L. T.(zhanglitao666@163.com)
摘要	Chloroplast PSII photochemical efficiency is upregulated more rapidly than CO2 assimilation during photosynthesis induction, suggesting the existence of other electron sinks than that of CO2 assimilation. We hypothesized that the mitochondrial alternative oxidase (AOX) pathway could be such a sink. Inhibition of the AOX restricted light activation of the malate-oxaloacetate shuttle and caused an excessive reduction of PSI acceptor side and substantial accumulation of QA-, hindering the photosynthetic linear electron transport rate (ETR) and leading to an imbalance between light energy absorption and exploitation during photosynthetic induction. ETR limitation also restricted the formation of thylakoid pH gradient, evidenced by a decreased de-epoxidation of the xanthophyll cycle, thus preventing nonphotochemical quenching. Delayed CO2 assimilation due to thylakoid pH gradient restriction was partially reversed by exogenous ATP application. The AOX pathway acts as a photosynthetic electron sink, protecting the photosynthetic apparatus against photoinhibition and accelerating the induction of CO2 assimilation during photosynthetic induction in Rumex K-1 leaves.
关键词	alternative oxidase photodamage photosystem II photochemical efficiency photosynthetic induction Rumex K-1
DOI	10.32615/ps.2021.047
收录类别	SCI
语种	英语
资助项目	Scientific Research Foundation for Advanced Scholars, Qingdao Agricultural University[20210056] ; State Key Laboratory of Crop Biology[2017KF05]
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000733910700015
出版者	ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/177552
专题	中国科学院海洋研究所
通讯作者	Zhang, L. T.
作者单位	1.Qingdao Agr Univ, Coll Landscape Architecture & Forestry, Qingdao, Shandong, Peoples R China 2.Qingdao Agr Univ, Inst Oceanol, Qingdao, Shandong, Peoples R China
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Cheng, D. D.,Zhang, L. T.. Mitochondrial alternative oxidase pathway acts as an electron sink during photosynthetic induction in Rumex K-1 leaves[J]. PHOTOSYNTHETICA,2021,59(4):615-624.
APA	Cheng, D. D.,&Zhang, L. T..(2021).Mitochondrial alternative oxidase pathway acts as an electron sink during photosynthetic induction in Rumex K-1 leaves.PHOTOSYNTHETICA,59(4),615-624.
MLA	Cheng, D. D.,et al."Mitochondrial alternative oxidase pathway acts as an electron sink during photosynthetic induction in Rumex K-1 leaves".PHOTOSYNTHETICA 59.4(2021):615-624.

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