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Plant and Cell Physiology, 1985, Vol. 26, No. 7 1425-1431
© 1985

Article

O3 Tolerance and the Ascorbate-Dependent H2O2 Decomposing System in Chloroplasts

Kiyoshi Tanaka1, Yoshiko Suda2, Noriaki Kondo1 and Kiyoshi Sugahara1

1Division of Environmental Biology, the National Institute for Environmental Studies Yalabe, Ibaraki 305, Japan
2Department of Environmental Chemistry, Faculty of Science, Toho University Funabashi, Chiba 274, Japan

The relationship between O3 tolerance and the chloroplast H2O2 scavenging system (PS I->ferredoxin->NADP->GSH->ascorbate) was investigated. When spinach plants were fumigated with 0.5 ppm O3, the levels of ascorbate decreased within a few hours. In six spinach cultivars, King of Denmark and Touko, which have a strong tolerance to O3, were found to have higher ascorbate and glutathione levels than the other cultivars. However, there was no remarkable difference among these six cultivars in the levels of enzymes which protect plants against active oxygen. When spinach plants were fumigated with a low concentration of O3 (0.1 ppm), which caused no visible injury, an increase in ascorbate peroxidase activity was found within a few days. The results suggest a possible involvement of the chloroplast H2O2 scavenging system in detoxifying O3.

(Received June 3, 1985; Accepted August 12, 1985)
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