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Photosystem I photoinhibition induced by fluctuating light depends on background low light irradiance
Tan,Shun-Ling; Huang,Jia-Lin; Zhang,Feng-Ping; Zhang,Shi-Bao; Huang,Wei
2021
Source PublicationENVIRONMENTAL AND EXPERIMENTAL BOTANY
ISSN0098-8472
Volume181Pages:104298
AbstractFluctuating light (FL) can induce the preferential photoinhibition of photosystem I (PSI) in angiosperms. However, the underlying mechanisms have not been fully clarified. In this study, we examined the effects of low-light phases on FL-induced photoinhibition of PSI in Bletilla striata. We found that PSI was highly over-reduced within the first 20 s after transition from 59 to 1455 mu mol photons m(-2) s(-1). However, such severe over-reduction of PSI was not observed in FL transition from 132 or 272-1455 mu mol photons m(-2) s(-1). As a result, FL (59-1455) induced stronger PSI photoinhibition than FL (132-1455) and FL (272-1455). During low-light phase, a higher light intensity induced a higher proton gradient (Delta pH) across the thylakoid membranes, favoring the rapid formation of Delta pH after light increased and preventing an over-reduction of PSI. These results indicate that the low-light phase significantly affects the extent of PSI photoinhibition in FL. After transition from 59 or 132-1455 mu mol photons m(-2) s(-1), CEF activity first increased and then decreased to the steady-state. However, such transient CEF stimulation was not observed during the transition from 272-1455 mu mol photons m(-2) s(-1). Furthermore, the CEF activation in the high-light phase was highly dependent on the PSI reduction state. We conclude that CEF activation is finely regulated to optimize the trade-off between photoprotection and light use efficiency in FL.
KeywordCyclic electron transport Photoprotection Photosynthesis Proton gradient Reactive oxygen species CYCLIC ELECTRON FLOW PROTON MOTIVE FORCE THYLAKOID MEMBRANES CO2 ASSIMILATION TRANSPORT LEAVES PSI PHOTOPROTECTION PHOTOSYNTHESIS ACCLIMATION
DOI10.1016/j.envexpbot.2020.104298
WOS IDWOS:000593778500001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/73624
Collection中国科学院昆明植物研究所
Affiliation1.[Tan, Shun-Ling
2.Huang, Jia-Lin
3.Zhang, Feng-Ping
4.Zhang, Shi-Bao
5.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China
6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Tan,Shun-Ling,Huang,Jia-Lin,Zhang,Feng-Ping,et al. Photosystem I photoinhibition induced by fluctuating light depends on background low light irradiance[J]. ENVIRONMENTAL AND EXPERIMENTAL BOTANY,2021,181:104298.
APA Tan,Shun-Ling,Huang,Jia-Lin,Zhang,Feng-Ping,Zhang,Shi-Bao,&Huang,Wei.(2021).Photosystem I photoinhibition induced by fluctuating light depends on background low light irradiance.ENVIRONMENTAL AND EXPERIMENTAL BOTANY,181,104298.
MLA Tan,Shun-Ling,et al."Photosystem I photoinhibition induced by fluctuating light depends on background low light irradiance".ENVIRONMENTAL AND EXPERIMENTAL BOTANY 181(2021):104298.
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