摘要
超敏反应(HR)是植物抗性反应激活所表现出的最为常见的特征。植物的超敏性细胞死亡在生物化学和形态学上有许多特征与动物的细胞凋亡相似,并且受寄主植物的 R基因和病原菌的avr 基因产物相互作用所控制,R基因产物与参与动物细胞凋亡的CED-4和APAF-1 蛋白有相似之处,因此,超敏性细胞死亡明显是细胞程序化死亡(PCD)的一种形式。HR中有多种信号分子的参与,活性氧是诱导 HR的一个重要因子,并且活性氧的产生与水杨酸(SA)有着直接的关系。HR很可能是作为一个信号系统而不是直接作为植物的一种防御机制。
The hypersensitive response (HR) is common characteristic of activating plant resistance response to microbial pathogens. The hypersensitive cell death share a few biochemical and morphological features of animal apoptosis, and is controlled by interaction between host plant resistance (R) gene products and those of pathogen avirulence(avr) gene. those products have some similarities to CED-4 and APAF-1 proteins that involve in animal apoptosis.Thus hypersensitive cell death appears to be a form of programmed cell death (PCD).There are multiple sig naling moleculars in plant undergoing HR. Reactive oxygen is a significant factor in triggering the HR, and salicylic acid(SA) is directly related to generation of reactive oxygen. It is likely that HR acts more as signal system than as a defence mechanism.
出处
《黑龙江农业科学》
2005年第2期31-34,共4页
Heilongjiang Agricultural Sciences
