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Plant and Cell Physiology Advance Access originally published online on December 16, 2005
Plant and Cell Physiology 2006 47(2):304-308; doi:10.1093/pcp/pci246
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Short Communication

Cytosolic Dehydroascorbate Reductase is Important for Ozone Tolerance in Arabidopsis thaliana

Seiji Yoshida1,3,6, Masanori Tamaoki3,6,*, Takeshi Shikano5, Nobuyoshi Nakajima3, Daisuke Ogawa2,3, Motohide Ioki3, Mitsuko Aono4, Akihiro Kubo4, Hiroshi Kamada1,2, Yasunori Inoue5 and Hikaru Saji4

1 Master’s Program in Biosystem Studies, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577 Japan
2 Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577 Japan
3 Biodiversity Conservation Research Project, National Institute for Environmental Studies, Tsukuba, Ibaraki, 305-8506 Japan
4 Environmental Biology Division, National Institute for Environmental Studies, Tsukuba, Ibaraki, 305-8506 Japan
5 Applied Biological Science, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510 Japan

* Corresponding author: E-mail, mtamaoki{at}nies.go.jp; Fax, +81-29-850-2490.

Dehydroascorbate reductase (DHAR) is a key component of the ascorbate recycling system. Three functional DHAR genes are encoded in the Arabidopsis genome. Ozone exposure increased the expression of the cytosolic DHAR (cytDHAR) gene alone. We characterized an Arabidopsis mutant with a deficient cytDHAR. The mutant completely lacked cytDHAR activity and was highly ozone sensitive. The amounts of total ascorbate and glutathione were similar in both lines, but the amount of apoplastic ascorbate in the mutant was 61.5% lower. These results indicate that the apoplastic ascorbate, which is generated through the reduction of DHA by cytDHAR, is important for ozone tolerance.

6 These authors contributed equally to this work.

(Received July 5, 2005; Accepted December 12, 2005)
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