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

• Tanaka,Kiyoshi

  Division of Environmental Biology, the National Institute for Environmental Studies

• Suda,Yoshiko

  Department of Environmental Chemisty, Faculty of Science, Toho University

• Kondo,Noriaki

  Division of Environmental Biology, the National Institute for Environmental Studies

• Sugahara,Kiyoshi

  Division of Environmental Biology, the National Institute for Environmental Studies

Abstract

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.

Journal

• Plant and cell physiology

  Plant and cell physiology 26 (7), 1425-1431,

  Japanese Society of Plant Physiologists

Keywords

• Ascorbate
• Ascorbate peroxidase
• Glutathione
• Hydrogen peroxide
• Ozone tolerance
• Spinach

Details

• CRID: 1540572720360380800
• NII Article ID: 110003718893
• NII Book ID: AA0077511X
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10769314
• Text Lang: en
• Data Source:
  • NDL-Digital
  • CiNii Articles