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题名: Specific roles of cyclic electron flow around photosystem I in photosynthetic regulation in immature and mature leaves
作者: Huang, Wei1, 2; Yang, Ying-Jie2; null(张石宝)2
刊名: JOURNAL OF PLANT PHYSIOLOGY
关键词: Cyclic electron flow ; Lumen acidification ; Non-photochemical quenching ; ATP synthesis ; Photoprotection ; Photosynthetic control
英文摘要: Cyclic 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.
出版日期: 2017-02-01
卷号: 209, 期号:1, 页码:76-83
DOI标识: 10.1016/j.jplph.2016.11.013
语种: 英语
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/46047
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Yunnan, Peoples R China
2.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China

Recommended Citation:
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(1):76-83.
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