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	Increased sensitivity to salt stress in an ascorbate-deficient Arabidopsis mutant
	Huang, CH; He, WL; Guo, JK; Chang, XX; Su, PX; Zhang, LX
刊名	JOURNAL OF EXPERIMENTAL BOTANY
	2005-12-01
卷号	56期号:422页码:3041-3049
关键词	Arabidopsis thaliana ascorbate-glutathione cycle oxidative stress photosystem II vtc-1
ISSN号	0022-0957
DOI	10.1093/jxb/eri301
通讯作者	Zhang, LX()
英文摘要	The Arabidopsis thaliana ascorbate-deficient vtc-1 mutant has only 30% ascorbate contents of the wild type (WT). This ascorbate-deficient mutant was used here to study the physiological roles of ascorbate under salt stress in vivo. Salt stress resulted in a more significant decrease in CO2 assimilatory capacity in the vtc-1 mutant than in the WT. Photosystem II function in the Arabidopsis vtc-1 mutant also showed an increased sensitivity to salt stress. Oxidative stress, indicated by the hydrogen peroxide content, increased more dramatically in the vtc-1 mutant than in the WT under salt stress. To clarify the reason for the increased oxidative stress in the vtc-1 mutant, the contents of small antioxidant compounds and the activities of several antioxidant enzymes in the ascorbate-glutathione cycle were measured. Despite an elevated glutathione pool in the vtc-1 mutant, the ascorbate contents and the reduced form of ascorbate decreased very rapidly under salt stress. These results showed that the activities of MDAR and DHAR were lower in the vtc-1 mutant than in the WT under salt stress. Thus, low intrinsic ascorbate and an impaired ascorbate-glutathione cycle in the vtc-1 mutant under salt stress probably induced a dramatic decrease in the reduced form of ascorbate, which resulted in both enhanced ROS contents and decreased NPQ in the vtc-1 mutant.
收录类别	SCI
WOS关键词	CHLOROPHYLL FLUORESCENCE ; HYDROGEN-PEROXIDE ; HIGH LIGHT ; DEHYDROASCORBATE REDUCTASE ; ANTIOXIDANT DEFENSES ; XANTHOPHYLL CYCLE ; OXIDATIVE STRESS ; PHOTOSYSTEM-II ; GDP-MANNOSE ; PLANTS
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000233491300003
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2555742
专题	寒区旱区环境与工程研究所
通讯作者	Zhang, LX
作者单位	1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Sch Life Sci, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Huang, CH,He, WL,Guo, JK,et al. Increased sensitivity to salt stress in an ascorbate-deficient Arabidopsis mutant[J]. JOURNAL OF EXPERIMENTAL BOTANY,2005,56(422):3041-3049.
APA	Huang, CH,He, WL,Guo, JK,Chang, XX,Su, PX,&Zhang, LX.(2005).Increased sensitivity to salt stress in an ascorbate-deficient Arabidopsis mutant.JOURNAL OF EXPERIMENTAL BOTANY,56(422),3041-3049.
MLA	Huang, CH,et al."Increased sensitivity to salt stress in an ascorbate-deficient Arabidopsis mutant".JOURNAL OF EXPERIMENTAL BOTANY 56.422(2005):3041-3049.

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