Sustained Diurnal Stimulation of Cyclic Electron Flow in Two Tropical Tree Species Erythrophleum guineense and Khaya ivorensis

doi:10.3389/fpls.2015.01068

	Sustained Diurnal Stimulation of Cyclic Electron Flow in Two Tropical Tree Species Erythrophleum guineense and Khaya ivorensis
	Huang, Wei; Yang, Ying-Jie; Hu, Hong; Cao, Kun-Fang; Zhang, Shi-Bao
	2016-07-19
发表期刊	FRONTIERS IN PLANT SCIENCE
卷号	7
摘要	The photosystem II (PSII) activity of C-3 plants is usually inhibited at noon associated with high light but can be repaired fast in the afternoon. However, the diurnal variation of photosystem I (PSI) activity is unknown. Although, cyclic electron flow (CEF) has been documented as an important mechanism for photosynthesis, the diurnal variation of CEF in sun leaves is little known. We determined the diurnal changes in PSI and PSII activities, light energy dissipation in PSII and the P700 redox state in two tropical tree species Erythrophleum guineense and Khaya ivorensis grown in an open field. The PSI activity (as indicated by the maximum quantity of photo-oxidizable P700) was maintained stable during the daytime. CEF was strongly activated under high light at noon, accompanying with high levels of non-photochemical quenching (NPQ) and PSI oxidation ratio. In the afternoon, CEF was maintained at a relatively high level under low light, which was accompanied with low levels of NPQ and P700 oxidation ratio. These results indicated that CEF was flexibly modulated during daytime under fluctuating light conditions. Under high light at noon, CEF-dependent generation of proton gradient across the thylakoid membranes (Delta pH) mainly contributed to photoprotection for PSI and PSII. By comparison, at low light in the afternoon, the CEF-dependent formation of Delta pH may be important for PSII repair via an additional ATP synthesis.
关键词	Cyclic Electron Flow Photoprotection Photosystem i Photosystem Ii Recovery
DOI	10.3389/fpls.2015.01068
收录类别	SCI
语种	英语
WOS记录号	WOS:000379875200001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/28486
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. Sustained Diurnal Stimulation of Cyclic Electron Flow in Two Tropical Tree Species Erythrophleum guineense and Khaya ivorensis[J]. FRONTIERS IN PLANT SCIENCE,2016,7.
APA	Huang, Wei,Yang, Ying-Jie,Hu, Hong,Cao, Kun-Fang,&Zhang, Shi-Bao.(2016).Sustained Diurnal Stimulation of Cyclic Electron Flow in Two Tropical Tree Species Erythrophleum guineense and Khaya ivorensis.FRONTIERS IN PLANT SCIENCE,7.
MLA	Huang, Wei,et al."Sustained Diurnal Stimulation of Cyclic Electron Flow in Two Tropical Tree Species Erythrophleum guineense and Khaya ivorensis".FRONTIERS IN PLANT SCIENCE 7(2016).

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