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Superoxide generated in the chloroplast stroma causes photoinhibition of photosystem I in the shade-establishing tree species Psychotria henryi

文献类型：期刊论文

作者Huang, Wei1,2; Yang, Ying-Jie1; Zhang, Jiao-Lin2; Hu, Hong1; Zhang, Shi-Bao1
刊名PHOTOSYNTHESIS RESEARCH
出版日期2017-06-01
卷号132页码:293-303
关键词Chlorophyll Fluorescence Methyl Viologen P700 Oxidation Photosystem i Photoinhibition Superoxide
DOI10.1007/s11120-017-0389-4
文献子类Article
英文摘要Our previous studies indicated that high light induced significant photoinhibition of photosystem I (PSI) in the shade-establishing tree species Psychotria henryi. However, the underlying mechanism has not been fully clarified. In the present study, in order to investigate the mechanism of PSI photoinhibition in P. henryi, we treated detached leaves with constant high light in the presence of methyl viologen (MV) or a soluble alpha-tocopherol analog, 2,2,5,7,8-pentamethyl-6-chromanol (PMC). We found that MV significantly depressed photochemical quantum yields in PSI and PSII when compared to PMC. On condition that no PSI photoinhibition happened, although cyclic electron flow (CEF) was abolished in the MV-treated samples, P700 oxidation ratio was maintain at higher levels than the PMC-treated samples. In the presence of PMC, PSI photoinhibition little changed but PSII photoinhibition was significantly alleviated. Importantly, PSI photoinhibition was largely accelerated in the presence of MV, which stimulates the production of superoxide and subsequently other reactive oxygen species at the chloroplast stroma by accepting electrons from PSI. Furthermore, MV largely aggravated PSII photoinhibition when compared to control. These results suggest that high P700 oxidation ratio cannot prevent PSI photoinhibition in P. henryi. Furthermore, the superoxide produced in the chloroplast stroma is critical for PSI photoinhibition in the higher plant P. henryi, which is opposite to the mechanism underlying PSI photoinhibition in Arabidopsis thaliana and spinach. These findings highlight a new mechanism of PSI photoinhibition in higher plants.
WOS关键词CYCLIC ELECTRON FLOW ; CUCUMIS-SATIVUS L ; FLUCTUATING LIGHT ; SINGLET OXYGEN ; TOBACCO-LEAVES ; ARABIDOPSIS-THALIANA ; REPAIR CYCLE ; REDOX STATE ; PSII ; PHOTOSYNTHESIS
WOS研究方向Plant Sciences
语种英语
WOS记录号WOS:000402083700008
资助机构National Natural Science Foundation of China(31300332 ; open fund from Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences ; 31670343)
源URL[http://ir.kib.ac.cn/handle/151853/51358]  
专题昆明植物研究所_资源植物与生物技术所级重点实验室
作者单位1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Econ Plants & Biotechnol, Kunming 650201, Yunnan, Peoples R China
2.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Key Lab Trop Forest Ecol, Mengla 666303, Yunnan, Peoples R China
推荐引用方式
GB/T 7714		 Huang, Wei,Yang, Ying-Jie,Zhang, Jiao-Lin,et al. Superoxide generated in the chloroplast stroma causes photoinhibition of photosystem I in the shade-establishing tree species Psychotria henryi[J]. PHOTOSYNTHESIS RESEARCH,2017,132:293-303.
APA Huang, Wei,Yang, Ying-Jie,Zhang, Jiao-Lin,Hu, Hong,&Zhang, Shi-Bao.(2017).Superoxide generated in the chloroplast stroma causes photoinhibition of photosystem I in the shade-establishing tree species Psychotria henryi.PHOTOSYNTHESIS RESEARCH,132,293-303.
MLA Huang, Wei,et al."Superoxide generated in the chloroplast stroma causes photoinhibition of photosystem I in the shade-establishing tree species Psychotria henryi".PHOTOSYNTHESIS RESEARCH 132(2017):293-303.

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来源：昆明植物研究所

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