【摘要】 水杨酸 (SA)是植物的一种内源信号传导物质 ,外源SA能诱导植物防卫基因的表达并对病害产生部分保护效果 ;内源SA水平增加与防卫基因和抗病性发展一致 ,因此 ,SA是植物产生系统获得抗性 (SAR)必不可少的条件 ,但SA不是诱导SAR产生的唯一条件 ,SAR的产生是SA与其他物质共同作用的结果。一旦SAR诱导植物在侵染点产生一种信号 ,经过某些信号物质的传导最终可系统性地传播到整株植物 ,SA可能是这种信使 ,但这种信号的化学本质和分子机制尚缺乏实验证据。更多还原

【Abstract】 Salicylic acid (SA) is an important endogenous compound in plant signaling pathways. Exogenous SA can induce expression of plant defense genes and lead to a degree of protection against plant pathogens. Increases in endogenous SA levels correlates with expression of defense genes and development of pathogen resistance,indicating that SA is required in the expession of systemic acquired resistance (SAR) but is not the only factor. SAR expression results from joint action of SA and other compounds. SAR induces the plant to generate a signal at the site of infection,and this signal can then be translocated systemically to the entire plant by a signal transmitting compound. SA may be serving as the signal transmitter,although the chemical nature and molecular mechanism of the signal transmitter still lacks experimental evidence.更多还原