PSI-driven cyclic electron flow partially alleviates the peroxidation of red alga Gelidium amansii (Gelidiaceae) caused by temporary high temperature

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	PSI-driven cyclic electron flow partially alleviates the peroxidation of red alga Gelidium amansii (Gelidiaceae) caused by temporary high temperature
	Yongfu LI ; Jianguo LIU ; Litao ZHANG
发表期刊	Journal of Oceanology and Limnology
ISSN	2096-5508
	2022-01-15
出版年	2022
卷号	v.40 期号:01 页码:209-218
文献类型	CNKI期刊论文
摘要	PSI-driven cyclic electron fl ow(CEF-I) helps higher plants avoid severe heat damage.Gelidium amansii, a red seaweed used in the production of agar, inhabits subtidal rocks but can be found in the intertidal zone. The biological role of CEF-I is still unclear in this organism. Wild G. amansii was exposed to 30 ℃ heat stress for 12 h with continuous lighting. The results showed that treatment at 30 ℃ gradually decreased maximal PSⅡ photochemical e fficiency( F_v/F_m), linear electron transfer rate, and activity of photosynthetic reaction center. Both the maximal photochemical e fficiency under light( F_v'/F_m')and maximum quantum yield of light-adapted PSⅡ( Φ_(PSⅡ)) were maintained at a relatively stable level during the initial 6 h and then significantly decreased at 12 h. The up-regulated CEF-I helps to enhance proton gradient transfer across thylakoid membrane to protect oxygen-evolving complex against heat damage.Following the addition of a CEF-I inhibitor to plants, the F_v/F_m greatly decreased, suggesting that the CEF-I alleviates degree of photoinhibition caused by strong light. The results of measurement of antioxidant enzymes, including superoxide dismutase(SOD), ascorbate peroxidase(APX) and catalase(CAT), and the contents of H_2O_2 and malonaldehyde(MDA) provided additional evidence that CEF-I plays a protective role to a certain extent for G. amansii to manage stress at 30 ℃. Therefore, it can be concluded that CEF-I enables G. amansii to survive in intertidal zones by protecting it from the heat damage caused by high temperature stress.
关键词	cyclic electron flow Gelidium amansii heat stress chlorophyll fluorescence quantum yield natural distribution
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 Key R&D Program of China (No. 2019YFD0900700)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/187537
专题	中国科学院海洋研究所
作者单位	1.CASandShandongProvinceKeyLaboratoryofExperimentalMarineBiology,CenterforOceanMega-Science,InstituteofOceanology,ChineseAcademyofSciences 2.MarineBiologyandBiotechnologyLaboratory,PilotNationalLaboratoryforMarineScienceandTechnology(Qingdao)
推荐引用方式 GB/T 7714	Yongfu LI,Jianguo LIU,Litao ZHANG. PSI-driven cyclic electron flow partially alleviates the peroxidation of red alga Gelidium amansii (Gelidiaceae) caused by temporary high temperature. 2022.