摘要：以4叶期的水稻幼苗为材料，比较研究了铜胁迫下外源ABA对武运粳7号和关东194幼苗的缓解效应。研究结果表明：随着铜胁迫浓度的增加，武运粳7号和关东194叶片叶绿素含量、CAT活性和可溶性蛋白含量都呈下降趋势，SOD活性呈现先升后降的趋势，POD活性、细胞膜透性则呈上升趋势。但是，两种水稻叶片可溶性蛋白组分没有明显差异。喷施外源ABA对水稻抵抗铜胁迫具有一定的缓解作用。因此，在生产实践上可以考虑喷施一定浓度的ABA来缓解铜胁迫对作物造成的伤害。

Abstract：Effect of exogenous abscisic acid on the tolerance of copper in four-leaf-stage seedling of Wuyunjing 7 and Kanto 194 was studied. Results showed that with the increasing of the concentration of copper stress, chlorophyll content, the activity of CAT, and the content of soluble protein decreased. At the same time, the activity of SOD first increased and then decreased. However, the activity of POD, and permeability of cell membrane increased. Meanwhile, there were not obviously differences on the compositions of soluble protein. Therefore, using a certain concentration of exogenous abscisic acid to relieve the damage of copper stress can be considered in production practice.