Photoinhibition and photosynthetic regulation in fluctuating light under compound stresses of drought and heat

doi:10.1111/ppl.14406

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	Photoinhibition and photosynthetic regulation in fluctuating light under compound stresses of drought and heat
	Wang, Xiao-Qian; Zeng, Zhi-Lan; Li, Yi-Yun; Huang, Wei
	2024
发表期刊	PHYSIOLOGIA PLANTARUM
ISSN	0031-9317
卷号	176 期号:3 页码:e14406
摘要	Under the background of global climate change, crop leaves usually experience fluctuating light (FL) under compound stresses of drought and heat in the field. However, photoinhibition and photosynthetic regulation in FL under these compound stresses are little known. To elucidate this, we measured gas exchange, chlorophyll fluorescence, P700 redox state and electrochromic shift signals for tomato (Solanum lycopersicum) leaves exposed to FL under individual and compound stresses of moderate drought and heat stresses. After treatment with short-term FL, photosystem I (PSI) activity decreased slightly in all treatments. By comparison, photosystem II (PSII) activity was reduced slightly under individual stress but largely decreased by 46% under compound stresses. Therefore, PSI is more tolerant than PSII when exposed to FL under compound stresses of drought and heat. Under compound stresses, PSII photoinhibition largely downregulated linear electron flow and photorespiration became a major electron sink downstream. Concomitantly, cyclic electron flow (CEF) was highly enhanced to help the building up of trans-thylakoid proton gradient. This study highlights the importance of PSII activity and CEF in crop tolerance under future compound climate extremes such as drought and heat.
DOI	10.1111/ppl.14406
WOS记录号	WOS:001252308700001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/75915
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Wang, Xiao-Qian,Zeng, Zhi-Lan,Li, Yi-Yun,et al. Photoinhibition and photosynthetic regulation in fluctuating light under compound stresses of drought and heat[J]. PHYSIOLOGIA PLANTARUM,2024,176(3):e14406.
APA	Wang, Xiao-Qian,Zeng, Zhi-Lan,Li, Yi-Yun,&Huang, Wei.(2024).Photoinhibition and photosynthetic regulation in fluctuating light under compound stresses of drought and heat.PHYSIOLOGIA PLANTARUM,176(3),e14406.
MLA	Wang, Xiao-Qian,et al."Photoinhibition and photosynthetic regulation in fluctuating light under compound stresses of drought and heat".PHYSIOLOGIA PLANTARUM 176.3(2024):e14406.

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