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Photosynthetic regulation under fluctuating light in field-grown Cerasus cerasoides: A comparison of young and mature leaves

文献类型： 外文期刊

作者： Yang, Ying-Jie 1 ; Zhang, Shi-Bao 1 ; Wang, Ji-Hua 3 ; Huang, Wei 1 ;

作者机构： 1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Yunnan Acad Agr Sci, Flower Res Inst, Kunming, Yunnan, Peoples R China

关键词： PSI redox state; Photoinhibition; Photoprotection; Cyclic electron flow; Developmental stages; Proton gradient

期刊名称：BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS （ 影响因子：3.991； 五年影响因子：5.144 ）

ISSN： 0005-2728

年卷期： 2019 年 1860 卷 11 期

页码：

收录情况： SCI

摘要： Photosystem I (PSI) is a potential target of photoinhibition under fluctuating light. However, photosynthetic regulation under fluctuating light in field-grown plants is little known. Furthermore, it is unclear how young leaves protect PSI against fluctuating light under natural field conditions. In the present study, we examined chlorophyll fluorescence, P700 redox state and the electrochromic shift signal in the young and mature leaves of field-grown Cerasus cerasoides (Rosaceae). Within the first seconds after any increase in light intensity, young leaves showed higher proton gradient (Delta pH) across the thylakoid membranes than the mature leaves, preventing over-reduction of PSI in the young leaves. As a result, PSI was more tolerant to fluctuating light in the young leaves than in the mature leaves. Interestingly, after transition from low to high light, the activity of cyclic electron flow (CEF) in young leaves increased first to a high level and then decreased to a stable value, while this rapid stimulation of CEF was not observed in the mature leaves. Furthermore, the over-reduction of PSI significantly stimulated CEF in the young leaves but not in the mature leaves. Taken together, within the first seconds after any increase in illumination, the stimulation of CEF favors the rapid lumen acidification and optimizes the PSI redox state in the young leaves, protecting PSI against photoinhibition under fluctuating light in field-grown plants.

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