Regulation of Chloroplast ATP Synthase Modulates Photoprotection in the CAM Plant Vanilla planifolia

doi:10.3390/cells11101647

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	Regulation of Chloroplast ATP Synthase Modulates Photoprotection in the CAM Plant Vanilla planifolia
	Wang, Hui; Wang, Xiao-Qian; Xing, Yi-Zhang; Zhao, Qing-Yun; Zhuang, Hui-Fa; Huang, Wei
	2022
发表期刊	CELLS
卷号	11 期号:10 页码:1647
摘要	Generally, regulation of cyclic electron flow (CEF) and chloroplast ATP synthase play key roles in photoprotection for photosystems I and II (PSI and PSII) in C3 and C4 plants, especially when CO2 assimilation is restricted. However, how CAM plants protect PSI and PSII when CO2 assimilation is restricted is largely known. In the present study, we measured PSI, PSII, and electrochromic shift signals in the CAM plant Vanilla planifolia. The quantum yields of PSI and PSII photochemistry largely decreased in the afternoon compared to in the morning, indicating that CO2 assimilation was strongly restricted in the afternoon. Meanwhile, non-photochemical quenching (NPQ) in PSII and the donor side limitation of PSI (Y(ND)) significantly increased to protect PSI and PSII. Under such conditions, proton gradient ( increment pH) across the thylakoid membranes largely increased and CEF was slightly stimulated, indicating that the increased increment pH was not caused by the regulation of CEF. In contrast, the activity of chloroplast ATP synthase (g(H)(+)) largely decreased in the afternoon. At a given proton flux, the decreasing g(H)(+) increased increment pH and thus contributed to the enhancement of NPQ and Y(ND). Therefore, in the CAM plant V. planifolia, the increment pH-dependent photoprotective mechanism is mainly regulated by the regulation of g(H)(+) rather than CEF when CO2 assimilation is restricted.
关键词	photosynthesis CAM plants photoprotection proton gradient cyclic electron flow CYCLIC ELECTRON FLOW PROTON MOTIVE FORCE PSI CEF-PSI PHOTOSYSTEM-I CO2 ASSIMILATION FLUCTUATING LIGHT PHOTOSYNTHETIC PROTON QUENCHING NPQ WHEAT LEAVES TRANSPORT
DOI	10.3390/cells11101647
收录类别	SCI
WOS记录号	WOS:000803374000001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74767
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Wang, Hui,Wang, Xiao-Qian,Xing, Yi-Zhang,et al. Regulation of Chloroplast ATP Synthase Modulates Photoprotection in the CAM Plant Vanilla planifolia[J]. CELLS,2022,11(10):1647.
APA	Wang, Hui,Wang, Xiao-Qian,Xing, Yi-Zhang,Zhao, Qing-Yun,Zhuang, Hui-Fa,&Huang, Wei.(2022).Regulation of Chloroplast ATP Synthase Modulates Photoprotection in the CAM Plant Vanilla planifolia.CELLS,11(10),1647.
MLA	Wang, Hui,et al."Regulation of Chloroplast ATP Synthase Modulates Photoprotection in the CAM Plant Vanilla planifolia".CELLS 11.10(2022):1647.

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