Roles of alternative electron flows in response to excess light in Ginkgo biloba

doi:10.1016/j.plantsci.2021.111030

KIB OpenIR

	Roles of alternative electron flows in response to excess light in Ginkgo biloba
	Yang,Ying-Jie ; Sun,Hu ; Zhang,Shi-Bao ; Huang,Wei
	2021
发表期刊	PLANT SCIENCE
ISSN	0168-9452
卷号	312 页码:111030
摘要	Ginkgo biloba L., the only surviving species of Ginkgoopsida, is a famous relict gymnosperm, it may provide new insight into the evolution of photosynthetic mechanisms. Flavodiiron proteins (FDPs) are conserved in nonflowering plants, but the role of FDPs in gymnosperms has not yet been clarified. In particular, how gymnosperms integrate FDPs and cyclic electron transport (CET) to better adapt to excess light is poorly understood. To elucidate these questions, we measured the P700 signal, chlorophyll fluorescence and electrochromic shift signal under fluctuating and constant light in G. biloba. Within the first seconds after light increased, G. biloba could not build up a sufficient proton gradient (ApH). Concomitantly, photo-reduction of O2 mediated by FDPs contributed to the rapid oxidation of P700 and protected PSI under fluctuating light. Therefore, in G. biloba, FDPs mainly protect PSI under fluctuating light at acceptor side. Under constant high light, the oxidation of PSI and the induction of non-photochemical quenching were attributed to the increase in ApH formation, which was mainly caused by the increase in CET rather than linear electron transport. Therefore, under constant light, CET finely regulates the PSI redox state and non-photochemical quenching through ApH formation, protecting PSI and PSII against excess light. We conclude that, in G. biloba, FDPs are particularly important under fluctuating light while CET is essential under constant high light. The coordination of FDPs and CET fine-tune photosynthetic apparatus under excess light.
关键词	Alternative electron flows Gymnosperms Photoprotection Photosynthesis Photosystem I Fluctuating light PROTON MOTIVE FORCE PHOTOSYSTEM-I FLUCTUATING LIGHT CO2 ASSIMILATION FLAVODIIRON PROTEINS PLANT-GROWTH PHOTOSYNTHESIS PHOTOINHIBITION TRANSPORT PHOTOPROTECTION
DOI	10.1016/j.plantsci.2021.111030
WOS记录号	WOS:000697058800007
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/73622
专题	中国科学院昆明植物研究所
作者单位	1.[Yang, Ying-Jie 2.Sun, Hu 3.Zhang, Shi-Bao 4.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Yang,Ying-Jie,Sun,Hu,Zhang,Shi-Bao,et al. Roles of alternative electron flows in response to excess light in Ginkgo biloba[J]. PLANT SCIENCE,2021,312:111030.
APA	Yang,Ying-Jie,Sun,Hu,Zhang,Shi-Bao,&Huang,Wei.(2021).Roles of alternative electron flows in response to excess light in Ginkgo biloba.PLANT SCIENCE,312,111030.
MLA	Yang,Ying-Jie,et al."Roles of alternative electron flows in response to excess light in Ginkgo biloba".PLANT SCIENCE 312(2021):111030.