植物对病原真菌、细菌、病毒侵染的最快速反应之一就是活性氧(reactive oxygen species,ROS)的大量、快速释放,即氧化爆发。O_2~-和H_2O_2是氧化爆发中最常见的2种活性氧,二者参与了植物的程序性细胞死亡(programmed cell death,PCD)过程,在植物细胞中ROS的高浓度累积能杀死受伤区域的边际部位,从而阻止病原菌的扩展,使损失降低到最小(Fath et al.,2002)。Caspase(cysteine-requiring aspartate protease)-3常被作为细胞凋亡的检测指标 One of the fastest response of plants to pathogenic fungi, bacteria and virus infection is the massive and rapid release of reactive oxygen species (ROS), that is, oxidative burst. O_2 ~ - and H_2O_2 are the two most common reactive oxygen species in oxidative burst. Both of them are involved in the programmed cell death (PCD) process in plants. The accumulation of ROS in plant cells can kill the injured area Of the marginal site, thus preventing the spread of pathogens, to minimize the loss (Fath et al., 2002). Caspase (cysteine-requiring aspartate protease) -3 is often used as a marker of apoptosis