Involvement of cyclic electron flow in irradiance stress responding and its potential regulation of the mechanisms in Pyropia yezoensis

IOCAS-IR

	Involvement of cyclic electron flow in irradiance stress responding and its potential regulation of the mechanisms in Pyropia yezoensis
	Niu JF(牛建峰); Feng JH(冯建华); Jie XJ(解修俊); Gao S(高山); Wang GC(王广策)
发表期刊	Chinese Journal of Oceanology and Limnology
ISSN	0254-4059
	2016-07-15
出版年	2016
卷号	v.34 期号:04 页码:104-113
文献类型	CNKI期刊论文
摘要	Pyropia yezoensis, belongs to the genus of P orphyra before 2011, inhabit on intertidal zone rocks where irradiation changes dramatically, implying that the seaweed has gained certain mechanisms to survive a harsh environment. Based on the photosynthetic parameters with or without the inhibitors determined by a Dual-PAM-100 apparatus, we investigated the photosynthetic performance and the changes in electron fl ow that occurred during the algae were stressed with dif ferent light intensities previously. When the irradiation saturation was approaching, the CEF around PS I became crucial since the addition of inhibitors usually led to an increase in non-photochemical quenching. The inhibitor experiments showed that there were at least three dif ferent CEF pathways in Py. yezoensis and these pathways compensated each other. In addition to maintaining a proper ratio of ATP/NAD(P)H to support effi cient photosynthesis, the potential roles of CEF might also include the regulation of dif ferent photoprotective mechanisms in Py. yezoensis. Under the regulation of CEF, chlororespiration is thought to transport electrons from the reduced plastoquinone(PQ) pool to oxygen in order to mitigate the reduction in the electron transfer chain. When irradiation was up to the high-grade stress conditions, the relative value of CEF began to decrease, which implied that the NADP+ pool or PQ + pool was very small and that the electrons were transferred from reduced PS I to oxygen. The scavenging enzymes might be activated and the water-water cycle probably became an ef fective means of removing the active oxygen produced by the irradiation stressed Py. yezoensis. We believe that the dif ferent mechanisms could make up the photoprotective network to allow Py. yezoensis for survival in a highly variable light stress habitat, which may enlighten scientists in future studies on irradiance stress in other algae species.
关键词	cyclic electron flow dual-PAM Pyropia yezoensis irradiation stress photoprotective mechanism
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A006;
CNKI专题名称	生物学;
分类号	Q945
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	Supported by the National Natural Science Foundation of China(No.41176134) ; the Laboratory for Marine Biology and Biotechnology,Qingdao National Laboratory for Marine Science and Technology,the Prospective Joint Research Project of Jiangsu Province(No.BY2011188) ; the National Basic Research Program of China(973 Program)(No.2011CB411908) ; the National Marine Public Welfare Research Project(Nos.201105023-8,201105008-2)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/189601
专题	中国科学院海洋研究所
作者单位	1.KeyLaboratoryofExperimentalMarineBiology,InstituteofOceanology,ChineseAcademyofSciences 2.NantongBranch,InstituteofOceanology,ChineseAcademyofSciences 3.LaboratoryforMarineBiologyandBiotechnology,QingdaoNationalLaboratoryforMarineScienceandTechnology 4.CollegeofMarineScienceandEngineering,TianjinUniversityofScienceandTechnology
推荐引用方式 GB/T 7714	Niu JF,Feng JH,Jie XJ,et al. Involvement of cyclic electron flow in irradiance stress responding and its potential regulation of the mechanisms in Pyropia yezoensis. 2016.