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Plasticity in roles of cyclic electron flow around photosystem I at contrasting temperatures in the chilling-sensitive plant Calotropis gigantea
Huang,Wei; Zhang,Shi-Bao; Xu,Jian-Chu; Liu,Tao
2017
Source PublicationENVIRONMENTAL AND EXPERIMENTAL BOTANY
ISSN0098-8472
Volume141Issue:1Pages:145-153
Abstract

Cyclic electron flow (CEF) around photosystem I is thought to balance the ATP/NADPH energy budget and protect photosynthetic apparatus. However, the plasticity in roles of CEF at contrasting temperatures is not well understood. We examined photosynthetic electron flow, non-photochemical quenching (NPQ), PSI redox state, and electrochromic shift (ECS) signal at 25 degrees C (normal temperature) and 4 degrees C (low temperature) for leaves of a chilling-sensitive tree species Calotropis gigantea. We found that electron flow through PSII (ETRII) was largely depressed at 4 degrees C irrespective of light condition, whereas CEF was enhanced under light intensities below 500 mu mol photons m(-2) s(-1) but suppressed under light intensities above 760 mu mol photons m(-2) s(-1). Meanwhile, both NPQ and PSI donor side limitation {Y(ND)] were enhanced at 4 degrees C. Moreover, the relationships between the rate of CEF and values for NPQ and Y(ND) changed between 4 degrees C and 25 degrees C. At low temperature, the proton gradient across thylakoid membranes (Delta pH) was enhanced and the thylakoid proton conductivity was depressed. Based on these results, we propose that, at normal growth temperature such as 25 degrees C, CEF contributes mainly to the balancing of ATP/NADPH energy budget required by primary metabolism. In contrast, at low temperature such as 4 degrees C, the main function of the CEF-dependent proton motive force is lumenal acidification, favoring photoprotection for photosynthetic apparatus. The plasticity in roles of CEF at contrasting temperatures may be regulated by the activity of thylakoid ATP synthase.

KeywordProton Motive Force Chlorophyll-a Fluorescence Psi cef-Psi Tobacco-leaves Arabidopsis-thaliana Physiological-role Fluctuating Light Atp Synthase Wheat Leaves Induced Photoinhibition Low Temperature Cyclic Electron Flow Photoprotection Photosynthetic Regulation Proton Motive Force
Subject AreaPlant Sciences ; Environmental Sciences
DOI10.1016/j.envexpbot.2017.07.011
Indexed BySCI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/54896
Collection资源植物与生物技术所级重点实验室
Recommended Citation
GB/T 7714
Huang,Wei,Zhang,Shi-Bao,Xu,Jian-Chu,et al. Plasticity in roles of cyclic electron flow around photosystem I at contrasting temperatures in the chilling-sensitive plant Calotropis gigantea[J]. ENVIRONMENTAL AND EXPERIMENTAL BOTANY,2017,141(1):145-153.
APA Huang,Wei,Zhang,Shi-Bao,Xu,Jian-Chu,&Liu,Tao.(2017).Plasticity in roles of cyclic electron flow around photosystem I at contrasting temperatures in the chilling-sensitive plant Calotropis gigantea.ENVIRONMENTAL AND EXPERIMENTAL BOTANY,141(1),145-153.
MLA Huang,Wei,et al."Plasticity in roles of cyclic electron flow around photosystem I at contrasting temperatures in the chilling-sensitive plant Calotropis gigantea".ENVIRONMENTAL AND EXPERIMENTAL BOTANY 141.1(2017):145-153.
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