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231223s2005 xx ||||| 00| ||eng c |
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|a pubmed24n0529.xml
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|a (NLM)16263910
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Huang, Chenghong
|e verfasserin
|4 aut
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| 245 |
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|a Increased sensitivity to salt stress in an ascorbate-deficient Arabidopsis mutant
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|c 2005
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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| 338 |
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|a Band
|b nc
|2 rdacarrier
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| 500 |
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|a Date Completed 20.01.2006
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|a Date Revised 30.03.2022
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a 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
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Antioxidants
|2 NLM
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|a Arabidopsis Proteins
|2 NLM
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|a Mutant Proteins
|2 NLM
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|a Photosynthetic Reaction Center Complex Proteins
|2 NLM
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|a Photosystem II Protein Complex
|2 NLM
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|a Reactive Oxygen Species
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|a Water
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|a Carbon Dioxide
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|a Hydrogen Peroxide
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|a Nucleotidyltransferases
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|a Glutathione
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|a Ascorbic Acid
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| 700 |
1 |
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|a He, Wenliang
|e verfasserin
|4 aut
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|a Guo, Jinkui
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Chang, Xuexiang
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Su, Peixi
|e verfasserin
|4 aut
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| 700 |
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|a Zhang, Lixin
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 56(2005), 422 vom: 01. Dez., Seite 3041-9
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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| 773 |
1 |
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|g volume:56
|g year:2005
|g number:422
|g day:01
|g month:12
|g pages:3041-9
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|d 56
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