Effects of water stress on AsA-GSH cycle and H₂0₂ content in maize root

H₂0₂ content and the change of main antioxidants in AsA-GSH cycle in two maize species with different resistances to drought were studied under water stress．The results showed that the activities of GR．APX and the content of GSH were obviously increased when the PEG concentration was lower than 100g／kg while they decreased when the PEG concentration was higher than 1.50g／kg．The content of AsA declined under different degrees of water stress．H₂0₂ content was increased under water stress conditions．The increase of H₂0₂ content is obviously positive correlation with the decrease of activity(content)of the antioxidants under severe water stress．The variety with stronger resistance to drought had higher activity of antioxidation．