O_3 Tolerance and the Ascorbate-Dependent H_2O_2 Decomposing System in Chloroplasts

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概要

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• The relationship between O_3 tolerance and the chloroplast H_2O_2 scavenging system (PS I→ferredoxin→NADP→GSH→ascorbate) was investigated. When spinach plants were fumigated with 0.5 ppm O_3, the levels of ascorbate decreased within a few hours. In six spinach cultivars, King of Denmark and Touko, which have a strong tolerance to O_3, 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 O_3 (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 H_2O_2 scavenging system in detoxifying O_3.

• 日本植物生理学会の論文

著者

• Tanaka Katsuyuki

  Dept. Biol. Sci. Fac. Sci. Hiroshima Univ.

• Kondo Noriaki

  Division Of Environmental Biology The National Institute For Environmental Studies

• Tanaka K

  Dept. Biol. Sci. Fac. Sci. Hiroshima Univ.

• Kondo Noriaki

  Division Of Biosciences Graduate School Of Sciences And Engineering Teikyo University Of Science And

• TANAKA Kiyoshi

  Division of Environmental Biology, National Institute for Environmental Studies

• Sugahara Kiyoshi

  Division of Environmental Biology, The National Institute for Environmental Studies

• Suda Yoshiko

  Department of Environmental Chemisty, Faculty of Science, Toho University

• Suda Yoshiko

  Department Of Environmental Chemisty Faculty Of Science Toho University

• Sugahara Kiyoshi

  Division Of Enviromental Biology The National Institute For Enviromental Studies

• Tanaka Kiyoshi

  Division Of Environmental Biology National Institute For Environmental Studies

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