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

文献类型： 外文期刊

作者： Wang, Hui 1 ; Wang, Xiao-Qian 2 ; Xing, Yi-Zhang 1 ; Zhao, Qing-Yun 1 ; Zhuang, Hui-Fa 3 ; Huang, Wei 2 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Spice & Beverage Res Inst, Wanning 571533, Peoples R China

2.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China

3.Key Lab Genet Improvement & Qual Regulat Trop Spi, Wanning 571533, Peoples R China

关键词： photosynthesis; CAM plants; photoprotection; proton gradient; cyclic electron flow

期刊名称：CELLS （ 影响因子：7.666； 五年影响因子：7.677 ）

ISSN：

年卷期： 2022 年 11 卷 10 期

页码：

收录情况： SCI

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.

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