PDF(Pubmed)
Abstract：
Various metabolites, including phytohormones, phytoalexins, and amino acids, take part in the plant immune system. Herein, we analyzed the effects of L-methionine (Met), a sulfur-containing amino acid, on the plant immune system in tomato. Treatment with low concentrations of Met enhanced the resistance of tomato to a broad range of diseases caused by the hemi-biotrophic bacterial pathogen Pseudomonas syringae pv. tomato (Pst) and the necrotrophic fungal pathogen Botrytis cinerea (Bc), although it did not induce the production of any antimicrobial substances against these pathogens in tomato leaf tissues. Analyses of gene expression and phytohormone accumulation indicated that Met treatment alone did not activate the defense signals mediated by salicylic acid, jasmonic acid, and ethylene. However, the salicylic acid-responsive defense gene and the jasmonic acid-responsive gene were induced more rapidly in Met-treated plants after infection with Pst and Bc, respectively. These findings suggest that low concentrations of Met have a priming effect on the phytohormone-mediated immune system in tomato.
摘要：
各种代谢物，包括植物激素,植物抗毒素,和氨基酸，参与植物免疫系统。在这里，我们分析了L-蛋氨酸（Met）的作用，含硫氨基酸,番茄中的植物免疫系统。用低浓度的Met处理可增强番茄对由半生物营养细菌病原体丁香假单胞菌pv引起的多种疾病的抵抗力。番茄（Pst）和坏死性真菌病原体灰霉病（Bc），尽管它没有诱导番茄叶片组织中针对这些病原体的任何抗菌物质的产生。基因表达和植物激素积累分析表明，单独的Met处理不能激活水杨酸介导的防御信号，茉莉酸,和乙烯。然而,在感染Pst和Bc后，在Met处理的植物中，水杨酸响应防御基因和茉莉酸响应基因被更快地诱导，分别。这些发现表明，低浓度的Met对番茄中植物激素介导的免疫系统具有启动作用。
