春小麦幼苗在水胁迫下内源ABA含量与自由基清除酶活力的变化

３个基因型的春小麦幼苗分别用ＰＥＧ作轻主胁迫（－０．６ＭＰａ）或中度胁迫（－１．５６ＭＰａ）的２个处理，不胁迫为对照，２ｄ后分开观察成熟叶和新生叶中内源ＡＢＡ和３个自由基清除酶活力对水胁迫的反应。３个基因型新生叶ＳＯＤ、ＣＡＴ平均活力极显著的高于成熟叶中的平均活力（Ｐ〈０．０１），ＰＯＤ却是成熟的高，中度胁迫与对照相比，各基因型各叶龄的酶活力除成熟叶中ＣＡＴ的活力显著下降（Ｐ〈０．０１）外，其它都

The response of endogenous ABA and enzymes activity of scavenging free radical of wheat seedling to water stress

The response of endogenous ABA and three enzymes activity of scavenging free radical in wheat seedling of three genotypes treated with -0.61 or -1.56 MPa PEG 4000,and control,was reported.Activity of SOD,CAT is higher in immature leaves than that in mature leaves ( P <0.01),but that of POD is lower in immature \{( P <0.01)\}.Treated with -1.56 MPa,SOD,CAT,POD activity in the two groups leaves of the three genotypes,increases in different degree as treated differently,except that of CAT in mature leaves decreasing.Endogenous ABA content in the immature is the highest under the treatment with -1.56 MPa PEG,and it of three genotypes is 12.92 to 17.25 times as that of the control groups,respectively,which indicated that the increase content of endogenous ABA is not the direct reason for the decreasing of enzymes activity of scavenging free radical.