Different roles of cyclic electron flow around photosystem I under sub-saturating and saturating light intensities in tobacco leaves

doi:10.3389/fpls.2015.00923

	Different roles of cyclic electron flow around photosystem I under sub-saturating and saturating light intensities in tobacco leaves
	Huang,Wei; Yang,Ying-Jie; Hu,Hong; Zhang,Shi-Bao
	2015-10-27
发表期刊	FRONTIERS IN PLANT SCIENCE
卷号	6
摘要	In higher plants, the generation of proton gradient across the thylakoid membrane (Delta pH) through cyclic electron flow (CEF) has mainly two functions: (1) to generate ATP and balance the ATP/NADPH energy budget, and (2) to protect photosystems I and II against photoinhibition. The intensity of light under which plants are grown alters both OFF activity and the ATP/NADPH demand for primary metabolic processes. However, it is unclear how the role of OFF is affected by the level of irradiance that is applied during the growth and measurement periods. We studied the role of CEF at different light intensities in leaves from sun- and shade grown plants. At 849 mu mol photons m(-2) both types of leaves had nearly the same degree of CEF activation. Modeling of the ATP/NADPH demand revealed that, at this light intensity, the contribution of CEF toward supplying ATP was much higher in the sun leaves. Meanwhile, the shade leaves showed higher levels of non photochemical quenching and the P700 oxidation ratio. Therefore, at 849 mu mol photons m(-2) s(-1), CEF mainly helped in the synthesis of ATP in the sun leaves, but functioned in photoprotection for the shade leaves. When the light intensity increased to 1976 mu mol photons m(-2) s(-1), CEF activation was greatly enhanced in the sun leaves, but its contribution to supplying ATP changed slightly. These results indicate that the main role of CEF is altered flexibly in response to light intensity. In particular, CEF mainly contributes to balancing the ATP/NADPH energy budget under sub saturating light intensities. When exposed to saturating light intensities, CEF mainly protects photosynthetic apparatus against photoinhibition.
关键词	Atp Synthesis Cyclic Electron Flow Light Acclimation Photoprotection Photorespiration Photosynthetic Control
DOI	10.3389/fpls.2015.00923
收录类别	SCI
语种	英语
WOS记录号	WOS:000364374400001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/25232
专题	资源植物与生物技术所级重点实验室
推荐引用方式 GB/T 7714	Huang,Wei,Yang,Ying-Jie,Hu,Hong,et al. Different roles of cyclic electron flow around photosystem I under sub-saturating and saturating light intensities in tobacco leaves[J]. FRONTIERS IN PLANT SCIENCE,2015,6.
APA	Huang,Wei,Yang,Ying-Jie,Hu,Hong,&Zhang,Shi-Bao.(2015).Different roles of cyclic electron flow around photosystem I under sub-saturating and saturating light intensities in tobacco leaves.FRONTIERS IN PLANT SCIENCE,6.
MLA	Huang,Wei,et al."Different roles of cyclic electron flow around photosystem I under sub-saturating and saturating light intensities in tobacco leaves".FRONTIERS IN PLANT SCIENCE 6(2015).

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