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In vivo regulation of thylakoid proton motive force in immature leaves
Huang, Wei1; Suorsa, Marjaana2; Zhang, Shi-Bao1
2018-11-01
Source PublicationPHOTOSYNTHESIS RESEARCH
ISSN0166-8595
Volume138Issue:2Pages:207-218
AbstractIn 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.
KeywordChloroplast ATP synthase Electron transfer Immature leaves Lumenal acidification P700 redox state Photoprotection
Language英语
Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/63088
Collection资源植物与生物技术所级重点实验室
Corresponding AuthorHuang, Wei
Affiliation1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China
2.Univ Turku, Turku 20014, Finland
Recommended Citation
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.
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