The water-water cycle is a major electron sink in Camellia species when CO2 assimilation is restricted

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	The water-water cycle is a major electron sink in Camellia species when CO2 assimilation is restricted
	Cai, Yan-Fei 1; Yang, Qiu-Yun 2; Li, Shu-Fa 1; Wang, Ji-Hua 1; Huang, Wei2
刊名	JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
	2017-03-01
卷号	168 期号:1 页码:59-66
关键词	Alternative electron flow Camellia Energy budget Photosynthesis Photorespiration Photoprotection
英文摘要	The water-water cycle (WWC) is thought to dissipate excess excitation energy and balance the ATP/NADPH energy budget under some conditions. However, the importance of the WWC in photosynthetic regulation remains controversy. We observed that three Camellia cultivars exhibited high rates of photosynthetic electron flow under high light when photosynthesis was restricted. We thus tested the hypothesis that the WWC is a major electron sink in the three Camellia cultivars when CO2 assimilation is restricted. Light response curves indicated that the WWC was strongly increased with photorespiration and was positively correlated with extra ATP supplied from other flexible mechanisms excluding linear electron flow, implying that the WWC is an important alternative electron sink to balance ATP/NADPH energy demand for sustaining photorespiration in Camellia cultivars. Interestingly, when photosynthesis was depressed by the decreases in stomatal and mesophyll conductance, the rates of photosynthetic electron flow through photosystem II declined slightly and the rates of WWC was enhanced. Furthermore, the increased electron flow of WWC was positively correlated with the ratio of Rubisco oxygenation to carboxylation, supporting the involvement of alternative electron flow in balancing the ATP/NADPH energy budget. We propose that the WWC is a crucial electron sink to regulate ATP/NADPH energy budget and dissipate excess energy excitation in Camellia species when CO2 assimilation is restricted. (C) 2016 Published by Elsevier B.V.
类目[WOS]	Biochemistry & Molecular Biology ; Biophysics
研究领域[WOS]	Biochemistry & Molecular Biology ; Biophysics
关键词[WOS]	GAS-EXCHANGE MEASUREMENTS ; OXYGEN-EVOLVING COMPLEX ; PHOTOSYSTEM-II ; CHLOROPHYLL FLUORESCENCE ; MESOPHYLL CONDUCTANCE ; THYLAKOID MEMBRANES ; PHYSIOLOGICAL-ROLE ; MEHLER REACTION ; CALVIN CYCLE ; WHEAT LEAVES
收录类别	SCI
语种	英语
WOS记录号	WOS:000397689500009
内容类型	期刊论文
源URL	[http://ir.kib.ac.cn/handle/151853/51003]
专题	昆明植物研究所_资源植物与生物技术所级重点实验室
作者单位	1.Yunnan Acad Agr Sci, Flower Res Inst, 2238 Beijing Rd, Kunming, Yunnan, Peoples R China 2.Chinese Acad Sci, Kunming Inst Bot, Key Lab Econ Plants & Biotechnol, 132 Lanhei Rd, Kunming 650201, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Cai, Yan-Fei,Yang, Qiu-Yun,Li, Shu-Fa,et al. The water-water cycle is a major electron sink in Camellia species when CO2 assimilation is restricted[J]. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY,2017,168(1):59-66.
APA	Cai, Yan-Fei,Yang, Qiu-Yun,Li, Shu-Fa,Wang, Ji-Hua,&Huang, Wei.(2017).The water-water cycle is a major electron sink in Camellia species when CO2 assimilation is restricted.JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY,168(1),59-66.
MLA	Cai, Yan-Fei,et al."The water-water cycle is a major electron sink in Camellia species when CO2 assimilation is restricted".JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 168.1(2017):59-66.