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Gene Review:

DHAR - dehydroascorbate reductase

Triticum aestivum

Chen, Z. et al., Okuda, T. et al.

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High impact information on DHAR

To examine whether overexpression of DHAR in plants would increase the level of ascorbic acid through improved ascorbate recycling, a DHAR cDNA from wheat was isolated and expressed in tobacco and maize, where DHAR expression was increased up to 32- and 100-fold, respectively [1].
In addition, the level of glutathione, the reductant used by DHAR, also increased, as did its redox state [1].
The activities of catalase and dehydroascorbate reductase were increased by the treatment of cold and paraquat, while 3-amino-1,2,4-triazole did not affect the dehydroascorbate reductase activity [2].

Associations of DHAR with chemical compounds

The increase in DHAR expression increased foliar and kernel ascorbic acid levels 2- to 4-fold and significantly increased the ascorbate redox state in both tobacco and maize [1].

References

Increasing vitamin C content of plants through enhanced ascorbate recycling. Chen, Z., Young, T.E., Ling, J., Chang, S.C., Gallie, D.R. Proc. Natl. Acad. Sci. U.S.A. (2003) [Pubmed]
Metabolic response to treatment with cold, paraquat, or 3-amino-1,2,4-triazole in leaves of winter wheat. Okuda, T., Matsuda, Y., Sugawara, M., Sagisaka, S. Biosci. Biotechnol. Biochem. (1992) [Pubmed]

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