Regulation of Leaf Angle Protects Photosystem I under Fluctuating Light in Tobacco Young Leaves

doi:10.3390/cells11020252

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	Regulation of Leaf Angle Protects Photosystem I under Fluctuating Light in Tobacco Young Leaves
	Zeng, Zhi-Lan; Sun, Hu; Wang, Xiao-Qian; Zhang, Shi-Bao; Huang, Wei
	2022
发表期刊	CELLS
卷号	11 期号:2 页码:252
摘要	Fluctuating light is a typical light condition in nature and can cause selective photodamage to photosystem I (PSI). The sensitivity of PSI to fluctuating light is influenced by the amplitude of low/high light intensity. Tobacco mature leaves are tended to be horizontal to maximize the light absorption and photosynthesis, but young leaves are usually vertical to diminish the light absorption. Therefore, we tested the hypothesis that such regulation of the leaf angle in young leaves might protect PSI against photoinhibition under fluctuating light. We found that, upon a sudden increase in illumination, PSI was over-reduced in extreme young leaves but was oxidized in mature leaves. After fluctuating light treatment, such PSI over-reduction aggravated PSI photoinhibition in young leaves. Furthermore, the leaf angle was tightly correlated to the extent of PSI photoinhibition induced by fluctuating light. Therefore, vertical young leaves are more susceptible to PSI photoinhibition than horizontal mature leaves when exposed to the same fluctuating light. In young leaves, the vertical leaf angle decreased the light absorption and thus lowered the amplitude of low/high light intensity. Therefore, the regulation of the leaf angle was found for the first time as an important strategy used by young leaves to protect PSI against photoinhibition under fluctuating light. To our knowledge, we show here new insight into the photoprotection for PSI under fluctuating light in nature.
关键词	leaf angle fluctuating light photosynthesis photoinhibition photoprotection photosystem I CYCLIC ELECTRON FLOW PROTON MOTIVE FORCE FLAVODIIRON PROTEINS CO2 ASSIMILATION PHOTOINHIBITION PHOTOPROTECTION PHOTOSYNTHESIS TRANSPORT MOVEMENT STRESS
DOI	10.3390/cells11020252
收录类别	SCI
WOS记录号	WOS:000748169700001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74752
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Zeng, Zhi-Lan,Sun, Hu,Wang, Xiao-Qian,et al. Regulation of Leaf Angle Protects Photosystem I under Fluctuating Light in Tobacco Young Leaves[J]. CELLS,2022,11(2):252.
APA	Zeng, Zhi-Lan,Sun, Hu,Wang, Xiao-Qian,Zhang, Shi-Bao,&Huang, Wei.(2022).Regulation of Leaf Angle Protects Photosystem I under Fluctuating Light in Tobacco Young Leaves.CELLS,11(2),252.
MLA	Zeng, Zhi-Lan,et al."Regulation of Leaf Angle Protects Photosystem I under Fluctuating Light in Tobacco Young Leaves".CELLS 11.2(2022):252.

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