Cyclic Electron Flow around Photosystem I Promotes ATP Synthesis Possibly Helping the Rapid Repair of Photodamaged Photosystem II at Low Light
Huang, Wei1; Yang, Ying-Jie1,2; Zhang, Shi-Bao1; Liu, Tao3
2018-02-26
发表期刊FRONTIERS IN PLANT SCIENCE
ISSN1664-462X
卷号9页码:239
摘要In higher plants, moderate photoinhibition of photosystem II (PSII) leads to a stimulation of cyclic electron flow (CEF) at low light, which is accompanied by an increase in the P700 oxidation ratio. However, the specific role of CEF stimulation at low light is not well known. Furthermore, the mechanism underlying this increase in P700 oxidation ratio at low light is unclear. To address these questions, intact leaves of the shade-adapted plant Panax notoginseng were treated at 2258 m mol photons m(-2) s(-1) for 30 min to induce PSII photoinhibition. Before and after this high-light treatment, PSI and PSII activity, the energy quenching in PSII, the redox state of PSI and proton motive force (pmf) at a low light of 54 m mol photons m(-2) s(-1) were determined at the steady state. After high-light treatment, electron flow through PSII (ETRII) significantly decreased but CEF was remarkably stimulated. The P700 oxidation ratio significantly increased but non-photochemical quenching changed negligibly. Concomitantly, the total pmf decreased significantly and the proton gradient (1 pH) across the thylakoid membrane remained stable. Furthermore, the P700 oxidation ratio was negatively correlated with the value of ETRII. These results suggest that upon PSII photoinhibition, CEF is stimulated to increase the ATP synthesis, facilitating the rapid repair of photodamaged PSII. The increase in P700 oxidation ratio at low light cannot be explained by the change in pmf, but is primarily controlled by electron transfer from PSII.
关键词Atp Synthesis Cyclic Electron Flow Linear Electron Flow Proton Motive Force Psii Photoinhibition P700 Oxidation Ratio
语种英语
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文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/60451
专题植物化学与西部植物资源持续利用国家重点实验室
作者单位1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Econ Plants & Biotechnol, Kunming, Yunnan, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Yunnan Agr Univ, Natl Local Joint Engn Res Ctr Germplasm Utilizat, Kunming, Yunnan, Peoples R China
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Huang, Wei,Yang, Ying-Jie,Zhang, Shi-Bao,et al. Cyclic Electron Flow around Photosystem I Promotes ATP Synthesis Possibly Helping the Rapid Repair of Photodamaged Photosystem II at Low Light[J]. FRONTIERS IN PLANT SCIENCE,2018,9:239.
APA Huang, Wei,Yang, Ying-Jie,Zhang, Shi-Bao,&Liu, Tao.(2018).Cyclic Electron Flow around Photosystem I Promotes ATP Synthesis Possibly Helping the Rapid Repair of Photodamaged Photosystem II at Low Light.FRONTIERS IN PLANT SCIENCE,9,239.
MLA Huang, Wei,et al."Cyclic Electron Flow around Photosystem I Promotes ATP Synthesis Possibly Helping the Rapid Repair of Photodamaged Photosystem II at Low Light".FRONTIERS IN PLANT SCIENCE 9(2018):239.
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