In vivo regulation of thylakoid proton motive force in immature leaves

	In vivo regulation of thylakoid proton motive force in immature leaves
	Huang, Wei1 ; Suorsa, Marjaana 2; Zhang, Shi-Bao1
	2018-11-01
发表期刊	PHOTOSYNTHESIS RESEARCH
ISSN	0166-8595
卷号	138 期号:2 页码:207-218
摘要	In chloroplast, proton motive force (pmf) is critical for ATP synthesis and photoprotection. To prevent photoinhibition of photosynthetic apparatus, proton gradient (pH) across the thylakoid membranes needs to be built up to minimize the production of reactive oxygen species (ROS) in thylakoid membranes. However, the regulation of thylakoid pmf in immature leaves is little known. In this study, we compared photosynthetic electron sinks, P700 redox state, non-photochemical quenching (NPQ), and electrochromic shift (ECS) signal in immature and mature leaves of a cultivar of Camellia. The immature leaves displayed lower linear electron flow and cyclic electron flow, but higher levels of NPQ and P700 oxidation ratio under high light. Meanwhile, we found that pmf and pH were higher in the immature leaves. Furthermore, the immature leaves showed significantly lower thylakoid proton conductivity than mature leaves. These results strongly indicated that immature leaves can build up enough pH by modulating proton efflux from the lumenal side to the stromal side of thylakoid membranes, which is essential to prevent photoinhibition via thermal energy dissipation and photosynthetic control of electron transfer. This study highlights that the activity of chloroplast ATP synthase is a key safety valve for photoprotection in immature leaves.
关键词	Chloroplast ATP synthase Electron transfer Immature leaves Lumenal acidification P700 redox state Photoprotection
语种	英语
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/63088
专题	资源植物与生物技术所级重点实验室
通讯作者	Huang, Wei
作者单位	1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China 2.Univ Turku, Turku 20014, Finland
推荐引用方式 GB/T 7714	Huang, Wei,Suorsa, Marjaana,Zhang, Shi-Bao. In vivo regulation of thylakoid proton motive force in immature leaves[J]. PHOTOSYNTHESIS RESEARCH,2018,138(2):207-218.
APA	Huang, Wei,Suorsa, Marjaana,&Zhang, Shi-Bao.(2018).In vivo regulation of thylakoid proton motive force in immature leaves.PHOTOSYNTHESIS RESEARCH,138(2),207-218.
MLA	Huang, Wei,et al."In vivo regulation of thylakoid proton motive force in immature leaves".PHOTOSYNTHESIS RESEARCH 138.2(2018):207-218.