Coordination of Cyclic Electron Flow and Water-Water Cycle Facilitates Photoprotection under Fluctuating Light and Temperature Stress in the Epiphytic Orchid Dendrobium officinale

doi:10.3390/plants10030606

KIB OpenIR

	Coordination of Cyclic Electron Flow and Water-Water Cycle Facilitates Photoprotection under Fluctuating Light and Temperature Stress in the Epiphytic Orchid Dendrobium officinale
	Sun,Hu ; Shi,Qi ; Zhang,Shi-Bao ; Huang,Wei
	2021
发表期刊	PLANTS-BASEL
ISSN	2223-7747
卷号	10 期号:3 页码:606
摘要	Photosystem I (PSI) is the primary target of photoinhibition under fluctuating light (FL). Photosynthetic organisms employ alternative electron flows to protect PSI under FL. However, the understanding of the coordination of alternative electron flows under FL at temperature stresses is limited. To address this question, we measured the chlorophyll fluorescence, P700 redox state, and electrochromic shift signal in leaves of Dendrobium officinale exposed to FL at 42 degrees C, 25 degrees C, and 4 degrees C. Upon a sudden increase in illumination at 42 degrees C and 25 degrees C, the water-water cycle (WWC) consumed a significant fraction of the extra reducing power, and thus avoided an over-reduction of PSI. However, WWC was inactivated at 4 degrees C, leading to an over-reduction of PSI within the first seconds after light increased. Therefore, the role of WWC under FL is largely dependent on temperature conditions. After an abrupt increase in light intensity, cyclic electron flow (CEF) around PSI was stimulated at any temperature. Therefore, CEF and WWC showed different temperature responses under FL. Furthermore, the enhancement of CEF and WWC at 42 degrees C quickly generated a sufficient trans-thylakoid proton gradient (Delta pH). The inactivation of WWC at 4 degrees C was partially compensated for by an increased CEF activity. These findings indicate that CEF and WWC coordinate to protect PSI under FL at temperature stresses.
关键词	Dendrobium officinale cyclic electron flow water-water cycle photosynthesis photoprotection PROTON MOTIVE FORCE PHOTOSYSTEM-I FLAVODIIRON PROTEINS HEAT-STRESS PHOTOSYNTHETIC REGULATION THYLAKOID MEMBRANES REDOX STATE PSI PHOTOINHIBITION CHLOROPHYLL
DOI	10.3390/plants10030606
WOS记录号	WOS:000634074100001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/73619
专题	中国科学院昆明植物研究所
作者单位	1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Southwest Univ, Coll Hort & Landscape Architecture, Chongqing 400715, Peoples R China 4.Chinese Acad Sci, Kunming Inst Bot, Bioinnovat Ctr DR PLANT, Kunming 650201, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Sun,Hu,Shi,Qi,Zhang,Shi-Bao,et al. Coordination of Cyclic Electron Flow and Water-Water Cycle Facilitates Photoprotection under Fluctuating Light and Temperature Stress in the Epiphytic Orchid Dendrobium officinale[J]. PLANTS-BASEL,2021,10(3):606.
APA	Sun,Hu,Shi,Qi,Zhang,Shi-Bao,&Huang,Wei.(2021).Coordination of Cyclic Electron Flow and Water-Water Cycle Facilitates Photoprotection under Fluctuating Light and Temperature Stress in the Epiphytic Orchid Dendrobium officinale.PLANTS-BASEL,10(3),606.
MLA	Sun,Hu,et al."Coordination of Cyclic Electron Flow and Water-Water Cycle Facilitates Photoprotection under Fluctuating Light and Temperature Stress in the Epiphytic Orchid Dendrobium officinale".PLANTS-BASEL 10.3(2021):606.