摘要
植物由抗病基因介导的防卫过程存在一系列生理生化和分子生物学反应,这些反应从病原菌侵染点开始的超敏反应(HypersensitiveResponse,HR),并延伸到远处组织的系统抗性或获得性抗性(SystemicAcquiredResistance,SAR),受制于一种信号传导网络的调控。这个信号系统有抗病蛋白和病原菌非病毒性蛋白,在一种配体—受体的互作模式下激发,并由信号分子H2O2、NO和系统信号分子水杨酸(SA)、茉莉酸(JA)和乙烯(ET),通过关键调控基因传递和放大,最终诱导一系列防卫反应基因的表达和代谢的变化而产生抗性。植物防卫信号的产生类似于动物免疫系统因子的介导,并可由非寄主病原菌或诱导子诱发。这些信号途径所产生的广谱抗性为植物抗病基因工程的应用奠定了基础。
The defense procedure of plant mediated by R gene includes a series of physiological ,biochemical and molecular biological responses.These responses begin with the initial hypersonic response at the site of pathogen attack and with systematic defenses of acquired resistance in tissues distant from the invasion sites.These responses are controlled by a defense signaling conduction which is activated by the recognition of a plant resistance gene-encoded protein,R protein,and a pathogen avirulence gene-encoded protein, Avr protein . The signal of the perception of the Avr protein by signal molecules,H_2O_2,NO and the systematic signal molecules SA,JA and ethylene is transmitted and enlarged by the key controlling gene,resulting in the disease resistance from a series of defensive response gene expression and metabolism change.Plant defense signal uses the similar mechanism in the animal immunity system, and it can be initiated by non-parasitic pathogen and mediator.The broad-spectrum disease resistance produced by these signals has laid foundation for the application of plant antidisease gene engineering.
出处
《安徽农业科学》
CAS
北大核心
2005年第5期901-903,共3页
Journal of Anhui Agricultural Sciences
关键词
植物
抗病性
信号传导
Disease resistance
Defense signaling conduction
