Exogenous melatonin strongly affects dynamic photosynthesis and enhances water-water cycle in tobacco

doi:10.3389/fpls.2022.917784

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	Exogenous melatonin strongly affects dynamic photosynthesis and enhances water-water cycle in tobacco
	Sun, Hu; Wang, Xiao-Qian; Zeng, Zhi-Lan; Yang, Ying-Jie; Huang, Wei
	2022
发表期刊	FRONTIERS IN PLANT SCIENCE
卷号	13 页码:917784
摘要	Melatonin (MT), an important phytohormone synthesized naturally, was recently used to improve plant resistance against abiotic and biotic stresses. However, the effects of exogenous melatonin on photosynthetic performances have not yet been well clarified. We found that spraying of exogenous melatonin (100 mu M) to leaves slightly affected the steady state values of CO2 assimilation rate (A(N)), stomatal conductance (g(s)) and mesophyll conductance (g(m)) under high light in tobacco leaves. However, this exogenous melatonin strongly delayed the induction kinetics of g(s) and g(m), leading to the slower induction speed of A(N). During photosynthetic induction, A(N) is mainly limited by biochemistry in the absence of exogenous melatonin, but by CO2 diffusion conductance in the presence of exogenous melatonin. Therefore, exogenous melatonin can aggravate photosynthetic carbon loss during photosynthetic induction and should be used with care for crop plants grown under natural fluctuating light. Within the first 10 min after transition from low to high light, photosynthetic electron transport rates (ETR) for A(N) and photorespiration were suppressed in the presence of exogenous melatonin. Meanwhile, an important alternative electron sink, namely water-water cycle, was enhanced to dissipate excess light energy. These results indicate that exogenous melatonin upregulates water-water cycle to facilitate photoprotection. Taking together, this study is the first to demonstrate that exogenous melatonin inhibits dynamic photosynthesis and improves photoprotection in higher plants.
关键词	melatonin photosynthesis fluctuating light stomatal conductance mesophyll conductance photoprotection ELECTRON FLOW PHOTOSYSTEM-I MESOPHYLL CONDUCTANCE FLUCTUATING LIGHT CO2 ASSIMILATION TEMPERATURE RESPONSE OXIDATIVE STRESS CALVIN CYCLE LEAF LEAVES
DOI	10.3389/fpls.2022.917784
收录类别	SCI
WOS记录号	WOS:000841223200001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/75627
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Sun, Hu,Wang, Xiao-Qian,Zeng, Zhi-Lan,et al. Exogenous melatonin strongly affects dynamic photosynthesis and enhances water-water cycle in tobacco[J]. FRONTIERS IN PLANT SCIENCE,2022,13:917784.
APA	Sun, Hu,Wang, Xiao-Qian,Zeng, Zhi-Lan,Yang, Ying-Jie,&Huang, Wei.(2022).Exogenous melatonin strongly affects dynamic photosynthesis and enhances water-water cycle in tobacco.FRONTIERS IN PLANT SCIENCE,13,917784.
MLA	Sun, Hu,et al."Exogenous melatonin strongly affects dynamic photosynthesis and enhances water-water cycle in tobacco".FRONTIERS IN PLANT SCIENCE 13(2022):917784.

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