Photosystem I is tolerant to fluctuating light under moderate heat stress in two orchids Dendrobium officinale and Bletilla striata

doi:10.1016/j.plantsci.2020.110795

KIB OpenIR

	Photosystem I is tolerant to fluctuating light under moderate heat stress in two orchids Dendrobium officinale and Bletilla striata
	Yang,Ying-Jie ; Tan,Shun-Ling ; Sun,Hu ; Huang,Jia-Lin ; Huang,Wei; Zhang,Shi-Bao
	2021
发表期刊	PLANT SCIENCE
ISSN	0168-9452
卷号	303 页码:110795
摘要	Under natural field conditions, plants usually experience fluctuating light (FL) under moderate heat stress in summer. However, responses of photosystems I and II (PSI and PSII) to such combined stresses are not well known. Furthermore, the role of water-water cycle (WWC) in photoprotection in FL under moderate heat stress is poorly understood. In this study, we examined chlorophyll fluorescence and P700 redox state in FL at 42 degrees C in two orchids, Dendrobium officinale (with high WWC activity) and Bletilla striata (with low WWC activity). After FL treatment at 42 degrees C, PSI activity maintained stable while PSII activity decreased significantly in these two orchids. In D. officinale, the WWC could rapidly consume the excess excitation energy in PSI and thus avoided an over-reduction of PSI upon any increase in illumination. Therefore, in D. officinale, WWC likely protected PSI in FL at 42 degrees C. In B. striata, heat-induced PSII photoinhibition down-regulated electron flow from PSII and thus prevented an over-reduction of PSI after transition from low to high light. Consequently, in B. striata moderate PSII photoinhibition could protected PSI in FL at 42 degrees C. We conclude that, in addition to cyclic electron flow, WWC and PSII photoinhibition-repair cycle are two important strategies for preventing PSI photoinhibition in FL under moderate heat stress.
关键词	Dendrobium officinale Photoinhibition Photoprotection Photosystem I Photosystem II Water-water cycle PROTON MOTIVE FORCE CYCLIC ELECTRON FLOW FLAVODIIRON PROTEINS EXCITATION-ENERGY CHLOROPHYLL FLUORESCENCE CO2 ASSIMILATION PHOTOSYNTHESIS TRANSPORT PHOTOINHIBITION PHOTOPROTECTION
DOI	10.1016/j.plantsci.2020.110795
WOS记录号	WOS:000614153400009
引用统计	被引频次：19[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/73617
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.Chinese Acad Sci, Kunming Inst Bot, Bioinnovat Ctr DR PLANT, Kunming 650201, Yunnan, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Yang,Ying-Jie,Tan,Shun-Ling,Sun,Hu,et al. Photosystem I is tolerant to fluctuating light under moderate heat stress in two orchids Dendrobium officinale and Bletilla striata[J]. PLANT SCIENCE,2021,303:110795.
APA	Yang,Ying-Jie,Tan,Shun-Ling,Sun,Hu,Huang,Jia-Lin,Huang,Wei,&Zhang,Shi-Bao.(2021).Photosystem I is tolerant to fluctuating light under moderate heat stress in two orchids Dendrobium officinale and Bletilla striata.PLANT SCIENCE,303,110795.
MLA	Yang,Ying-Jie,et al."Photosystem I is tolerant to fluctuating light under moderate heat stress in two orchids Dendrobium officinale and Bletilla striata".PLANT SCIENCE 303(2021):110795.