论文部分内容阅读
在盐胁迫条件下，对耐盐性不同的２个陆地棉品种幼苗子叶和胚根的保护酶活性变化进行了比较。结果表明：盐胁迫条件下，２个品种ＰＯＤ，ＳＯＤ活性在胚根部位均有所增强，子叶部位则有不同程度的降低；耐盐性较强的枝棉３号在盐胁迫初期胚根部位ＰＯＤ、ＳＯＤ活性上升幅度大于耐盐性较弱的鲁棉１０２４，但随盐胁迫时间延长，枝棉３号ＰＯＤ、ＳＯＤ活性又开始下降，而鲁棉１０２４则持续上升；枝棉３号子叶部位ＰＯＤ、ＳＯＤ活性经调节之后均接近对照，而鲁棉１０２４的ＰＯＤ、ＳＯＤ活性则表现为持续下降。结果提示出棉花幼苗对盐渍的适应调节主要表现在根部，但棉花品种耐盐性差异则表现在子叶部位。
Under salt stress, the changes of activities of protective enzymes in cotyledon and radicle of two upland cotton varieties with different salt tolerance were compared. The results showed that under salt stress, the activities of POD and SOD in two cultivars increased at the radicle site and decreased at the cotyledon level. In the early stage of radicle stress, POD and SOD increased more than that of salt-tolerant Lushun1024. However, with the prolongation of salt stress, the activities of POD and SOD of Zhitian 3 began to decline again, while that of Lushian1024 continued to increase. After POD and SOD activities were regulated, they were close to the control, while the POD and SOD activity of Lushun 1024 showed a continuous decline. The results suggest that cotton seedlings adapt to salinity mainly in the roots, but differences in salt tolerance of cotton varieties are shown in cotyledons.