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J Plant Physiol. 2006 Nov;163(11):1179-84. Epub 2005 Nov 18.

Transgenic Arabidopsis plants expressing the rice dehydroascorbate reductase gene are resistant to salt stress.

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  • 1Department of Biology and Geoscience, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan. sbtushi@ipc.shizuoka.ac.jp

Abstract

Vitamin C (l-ascorbate) is important for antioxidative and metabolic functions in both plants and humans. Ascorbate itself is oxidized to dehydroascorbate during the process of antioxidation, and dehydroascorbate reductase (DHAR, EC 1.8.5.1) re-reduces the oxidized ascorbate. Therefore, this enzyme is assumed to be critical for ascorbate recycling. Here we show that the expression of rice DHAR in transgenic Arabidopsis thaliana enhanced resistance to salt stress. Salt tolerance was remarkably improved despite slight increases in DHAR activity and total ascorbate. This study provides direct evidence for the importance of DHAR in salt tolerance.

PMID:
17032619
[PubMed - indexed for MEDLINE]
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