Graduate School of Bioscience and Biotechnology, Fukui Prefectural University, Fukui 910-1195, Japan.
Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka 819-0395, Japan.
Int J Mol Sci. 2024 Jun 7;25(12):6315. doi: 10.3390/ijms25126315.
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 pv. ) and the necrotrophic fungal pathogen (), 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 and , respectively. These findings suggest that low concentrations of Met have a priming effect on the phytohormone-mediated immune system in tomato.
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。在此，我们分析了含硫氨基酸 L-蛋氨酸（Met）对番茄植物免疫系统的影响。低浓度 Met 的处理增强了番茄对广泛的半生物病原细菌病原体 pv. ）和坏死性真菌病原体 （）的抗性，尽管它没有诱导番茄叶片组织中产生任何针对这些病原体的抗菌物质。基因表达和植物激素积累分析表明，Met 处理本身并没有激活水杨酸、茉莉酸和乙烯介导的防御信号。然而，在 Met 处理的植物感染 pv. 后，水杨酸应答防御基因和茉莉酸应答基因分别更快地被诱导。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。
