番茄系统创伤信号因子研究进展

The Advances of Tomato Systemic Wound Response

当植物受到机械损伤或害虫伤害时,植物体会在受伤部位产生创伤信号分子启动防御基因的系统表达。许多研究表明系统素(或其前体原系统素)在受伤部位激活茉莉酸的合成,使之达到系统反应的水平,应对外来伤害;茉莉酸或其衍生物是重要的系统伤信号分子,它诱导伤防御基因的系统表达。自从系统素和茉莉酸被认为是伤诱导防御基因表达的信号分子后,番茄成为研究植物系统伤信号很好的模式植物。本文介绍了番茄的茉莉酸合成突变体、茉莉酸感知突变体和系统素功能突变体,及它们之间相互作用,并推测了茉莉酸和系统素在系统创伤信号调节中的作用。

The plants produce systemic wounding signals in the wounding site, which would lead to the expression of systemic defense gene when plants receive the mechanical wounding or the insect attack. Many studies indicate that systemin or its precursor protein prosy stemin act at or near the site of wounding to increase jasmonate acid syn- thesis to a level that is required for the systemic response and jasmonic acid or its derivatives act as a mobile wound signal to induce the systemic defense gene expression. Tomato plants were used as a model system since the systemin and the jasmonic acid were recognized as essential signals in wound-induced gene expression. Three mutants includ- ing the jasmonic acid biosynthetic mutant, jasmonic acid response mutant and systemin-specific mutant have been reviewd to introduce the systemic wound signaling in tomato plants.