Decreased photosystem II activity facilitates acclimation to fluctuating light in the understory plant Paris polyphylla

doi:10.1016/j.bbabio.2019.148135

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	Decreased photosystem II activity facilitates acclimation to fluctuating light in the understory plant Paris polyphylla
	Sun, Hu 1,2; Zhang, Shi-Bao 2; Liu, Tao 3; Huang, Wei 2
刊名	BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
	2020-02-01
卷号	1861 期号:2 页码:8
关键词	Electron transfer Fluctuating light Photoinhibition Photoprotection Photosynthesis Understory angiosperms
ISSN号	0005-2728
DOI	10.1016/j.bbabio.2019.148135
通讯作者	Liu, Tao(52133490@qq.com) ; Huang, Wei(huangwei@mail.kib.ac.cn)
英文摘要	In forests, understory plants are usually exposed to sunflecks on timescales of seconds or minutes. However, it is unclear how understory plants acclimate to fluctuating light. In this study, we compared chlorophyll fluorescence, PSI redox state and the electrochromic shift signal under fluctuating light between an understory plant Paris polyphylla (Liliaceae) and a light-demanding plant Bletilla striata (Orchidaceae). Within the first seconds after transition from low to high light, PSI was highly oxidized in P. polyphylla but was highly reduced in B. striata, although both species could not generate a sufficient trans-thylakoid proton gradient (Delta pH). Furthermore, the outflow of electrons from PSI to O-2 was not significant in P. polyphylla, as indicated by the P700 redox kinetics upon dark-to-light transition. Therefore, the different responses of PSI to fluctuating light between P. polyphylla and B. striata could not be explained by Delta pH formation or alternative electron transport. In contrast, upon a sudden transition from low to high light, electron flow from PSII was much lower in P. polyphylla than in B. striata, suggesting that the rapid oxidation of PSI in P. polyphylla was largely attributed to the lower PSII activity. We propose, for the first time, that down-regulation of PSII activity is an important strategy used by some understory angiosperms to cope with sunflecks.
WOS研究方向	Biochemistry & Molecular Biology ; Biophysics
语种	英语
WOS记录号	WOS:000508749700007
内容类型	期刊论文
源URL	[http://ir.kib.ac.cn/handle/151853/70634]
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
通讯作者	Liu, Tao; Huang, Wei
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China 3.Yunnan Agr Univ, Natl Local Joint Engn Res Ctr Germplasm Utilizat, Kunming 650201, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Sun, Hu,Zhang, Shi-Bao,Liu, Tao,et al. Decreased photosystem II activity facilitates acclimation to fluctuating light in the understory plant Paris polyphylla[J]. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS,2020,1861(2):8.
APA	Sun, Hu,Zhang, Shi-Bao,Liu, Tao,&Huang, Wei.(2020).Decreased photosystem II activity facilitates acclimation to fluctuating light in the understory plant Paris polyphylla.BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS,1861(2),8.
MLA	Sun, Hu,et al."Decreased photosystem II activity facilitates acclimation to fluctuating light in the understory plant Paris polyphylla".BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1861.2(2020):8.