Evidence for the role of cyclic electron flow in photoprotection for oxygen-evolving complex

doi:10.1016/j.jplph.2016.02.016

	Evidence for the role of cyclic electron flow in photoprotection for oxygen-evolving complex
	Huang, Wei1,2 ; Yang, Ying-Jie 2; Hu, Hong2 ; Zhang, Shi-Bao2 ; Cao, Kun-Fang 1
	2016-05-01
发表期刊	JOURNAL OF PLANT PHYSIOLOGY
卷号	194 页码:54-60
摘要	Cyclic electron flow (CEF) alleviates PSII photo-inhibition under high light by at least two different mechanisms: one is liked to thermal energy dissipation (qE) and the other one is independent of qE. However, the latter mechanism is unclear. Because the photodamage to PSII primarily occurred at the oxygen-evolving complex (OEC), and the stability of OEC is dependent on proton gradient across thylakoid membrane (Delta pH), we hypothesize that the CEF-dependent generation of Delta pH can alleviate photodamage to OEC. To test this hypothesis, we determined the effects of antimycin A (AA), methyl viologen (MV), chloramphenicol (CM), nigericin (Nig) on PSII activity and the stability of OEC for leaves of a light-demanding tropical tree species Erythrophleum guineense by the analysis of OKJIP chlorophyll a fluorescence transient. After high light treatment, the stronger decrease in F-v/F-m, in the AA-, CM-, MV-, and Nig-treated samples was accompanied with larger photo damage of OEC. The AA-treated samples significantly showed lower CEF activity than the H2O-treated samples. Although the AA-treated leaves significantly showed stronger PSII photo-inhibition and photo-damage of OEC compared to the H2O-treated leaves, the value of non photochemical quenching did not differ between them. Therefore, CEF activity was partly inhibited in the AA-treated samples, and the stronger PSII photo-inhibition in the AA-treated leaves was independent of qE. Taking together, we propose a hypothesis that CEF-dependent generation of Delta pH under high light plays an important role in photoprotection for the OEC activity. (C) 2016 Elsevier GmbH. All rights reserved.
关键词	Cyclic Electron Flow High Light Oxygen-evolving Complex Photo-protection Psii Photo-inhibition
DOI	10.1016/j.jplph.2016.02.016
收录类别	SCI
语种	英语
WOS记录号	WOS:000375853800007
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/26235
专题	资源植物与生物技术所级重点实验室
作者单位	1.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Key Lab Trop Forest Ecol, Mengla 666303, Yunnan, Peoples R China 2.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Huang, Wei,Yang, Ying-Jie,Hu, Hong,et al. Evidence for the role of cyclic electron flow in photoprotection for oxygen-evolving complex[J]. JOURNAL OF PLANT PHYSIOLOGY,2016,194:54-60.
APA	Huang, Wei,Yang, Ying-Jie,Hu, Hong,Zhang, Shi-Bao,&Cao, Kun-Fang.(2016).Evidence for the role of cyclic electron flow in photoprotection for oxygen-evolving complex.JOURNAL OF PLANT PHYSIOLOGY,194,54-60.
MLA	Huang, Wei,et al."Evidence for the role of cyclic electron flow in photoprotection for oxygen-evolving complex".JOURNAL OF PLANT PHYSIOLOGY 194(2016):54-60.

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