12 d龄的春小麦幼苗在 1 mmol· L- 1及 1 0 mmol· L- 1H2 O2 的胁迫锻炼过程中 ,质膜透性增大 ,O- · 及 H2 O2 含量增多 ,CAT活性升高 ,叶绿素含量降低 ,低浓度 H2 O2 胁迫使SOD活性上升 ,高浓度时却使其活性下降。经过 H2 O2 胁迫锻炼后的小麦遭受干旱胁迫时 ,叶绿素含量、SOD活性、CAT活性均高于对照组 ,而质膜透性、O- · 及 H2 O2 含量却低于对照组。表明 H2 O2 胁迫锻炼 ,提高了小麦幼苗的抗氧化能力 ,增强了其抗旱性 During 12-day-old spring wheat seedlings under stress conditions of 1 mmol · L -1 and 10 mmol · L -1 H 2 O 2, membrane permeability, O- and H 2 O 2 content increased, CAT activity increased, chlorophyll The content of SOD decreased while H 2 O 2 concentration was low, while its activity decreased at high concentration. After drought stress, the chlorophyll content, SOD activity and CAT activity of wheat after H2O2 stress training were higher than those of the control group, while the plasma membrane permeability, O ·· and H2O2 contents were lower than those of the control group. The results showed that H2O2 stress increased the antioxidant capacity of wheat seedlings and increased their drought resistance