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Photoinhibition of photosystem I under fluctuating light is linked to the insufficient Delta pH upon a sudden transition from low to high light
Huang, Wei1; Yang, Ying-Jie1,2; Zhang, Shi-Bao1
2019-04-01
Source PublicationENVIRONMENTAL AND EXPERIMENTAL BOTANY
ISSN0098-8472
Volume160Pages:112-119
AbstractDespite photosystem I (PSI) is susceptible to photoinhibition under fluctuating light in wild-type angiosperms, the underlying mechanism is not well known. Because proton gradient (Delta pH) across the thylakoid membranes plays a crucial role in protecting PSI, we hypothesized that PSI photoinhibition under fluctuating light may be linked to the formation of Delta pH. To test this hypothesis, we measured chlorophyll fluorescence, PSI redox state, and the electrochromic shift signal during transition from low to high light in two angiosperms Bletilla striate (Orchidaceae) and Arabidopsis thaliana. The measurement of fast P700 redox kinetics indicated that the fast re oxidation of P700 mediated by photo-reduction of O-2 was absent in B. striate. Furthermore, the redox state of PSI is highly determined by Delta pH in both species. For the first 20 s after transition from low to high light, both species could not build up a sufficient Delta pH, which was accompanied by the over-reduction of P700. During prolonged illumination at high light, the sufficient Delta pH made PSI to be highly oxidized. These results demonstrated that PSI photoinhibition under fluctuating light in wild-type angiosperms occurred mainly at the first 20s after an increase in light intensity, which was caused by the insufficient Delta pH.
KeywordAngiosperm Fluctuating light Photoinhibition Photosystem I Photosynthetic regulation Redox state of P700
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/65125
Collection资源植物与生物技术所级重点实验室
Corresponding AuthorZhang, Shi-Bao
Affiliation1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Huang, Wei,Yang, Ying-Jie,Zhang, Shi-Bao. Photoinhibition of photosystem I under fluctuating light is linked to the insufficient Delta pH upon a sudden transition from low to high light[J]. ENVIRONMENTAL AND EXPERIMENTAL BOTANY,2019,160:112-119.
APA Huang, Wei,Yang, Ying-Jie,&Zhang, Shi-Bao.(2019).Photoinhibition of photosystem I under fluctuating light is linked to the insufficient Delta pH upon a sudden transition from low to high light.ENVIRONMENTAL AND EXPERIMENTAL BOTANY,160,112-119.
MLA Huang, Wei,et al."Photoinhibition of photosystem I under fluctuating light is linked to the insufficient Delta pH upon a sudden transition from low to high light".ENVIRONMENTAL AND EXPERIMENTAL BOTANY 160(2019):112-119.
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