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Specific roles of cyclic electron flow around photosystem I in photosynthetic regulation in immature and mature leaves
Huang, Wei; Yang, Ying-Jie; Zhang, Shi-Bao
2017
Source PublicationJOURNAL OF PLANT PHYSIOLOGY
Volume209Issue:xPages:76-83
AbstractCyclic electron flow (CEF) around photosystem I (PSI) is essential for photosynthesis in mature leaves. However, the physiological roles of CEF in immature leaves are little known. Here, we measured the PSI and PSII activities, light response changes in PSI and PSII energy quenching for immature and mature leaves of Erythrophleum guineense grown under full sunlight. Comparing with the maximum quantum yield of PSII (F-v/F-m), the immature leaves had much lower values of the maximum photo-oxidizable P700 (P-m) than the mature leaves, suggesting the unsynchronized development of PSI and PSII activities. Furthermore, the immature leaves displayed significantly lower capacities for the photosynthetic electron flow through PSII (ETRII) and CEF. However, when exposed to high light, the immature leaves displayed higher levels of non-photochemical quenching (NPQ) and P700 oxidation ration [Y(ND)] than mature leaves. Under high light, the similar NPQ values were accompanied with much lower CEF activity in the immature leaves. These results suggest that, in immature leaves, CEF primarily contributes to photoprotection for PSI and PSII via acidification of thylakoid lumen. By comparison, in mature leaves, a large fraction of CEF-dependent generation of Delta pH contributes to ATP synthesis and a relative small proportion favors photoprotection via lumen acidification. These findings highlight the specific roles of CEF in photosynthetic regulation in immature and mature leaves. (C) 2016 Elsevier GmbH. All rights reserved.
Department其他
KeywordCyclic Electron Flow Lumen Acidification Non-photochemical Quenching Atp Synthesis Photoprotection Photosynthetic Control
Language英语
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10771
Collection植物生理生态研究组
Recommended Citation
GB/T 7714
Huang, Wei,Yang, Ying-Jie,Zhang, Shi-Bao. Specific roles of cyclic electron flow around photosystem I in photosynthetic regulation in immature and mature leaves[J]. JOURNAL OF PLANT PHYSIOLOGY,2017,209(x):76-83.
APA Huang, Wei,Yang, Ying-Jie,&Zhang, Shi-Bao.(2017).Specific roles of cyclic electron flow around photosystem I in photosynthetic regulation in immature and mature leaves.JOURNAL OF PLANT PHYSIOLOGY,209(x),76-83.
MLA Huang, Wei,et al."Specific roles of cyclic electron flow around photosystem I in photosynthetic regulation in immature and mature leaves".JOURNAL OF PLANT PHYSIOLOGY 209.x(2017):76-83.
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