Corrado G, Sasso R, Pasquariello M, Iodice L, Carretta A, Cascone P, Ariati L, Digilio M C, Guerrieri E, Rao R
Dipartimento di Scienze del Suolo della Pianta e dell'Ambiente, Università degli Studi di Napoli Federico II, 80055, Portici, Naples, Italy.
J Chem Ecol. 2007 Apr;33(4):669-81. doi: 10.1007/s10886-007-9254-9. Epub 2007 Feb 28.
The prevailing reaction of plants to pest attack is the activation of various defense mechanisms. In tomato, several studies indicate that an 18 amino acid (aa) peptide, called systemin, is a primary signal for the systemic induction of direct resistance against plant-chewing pests, and that the transgenic expression of the prosystemin gene (encoding the 200 aa systemin precursor) activates genes involved in the plant response to herbivores. By using a combination of behavioral, chemical, and gene expression analyses, we report that systemin enhances the production of bioactive volatile compounds, increases plant attractivity towards parasitiod wasps, and activates genes involved in volatile production. Our data imply that systemin is involved in the systemic activation of indirect defense in tomato, and we conclude that a single gene controls the systemic activation of coordinated and associated responses against pests.
植物对害虫攻击的主要反应是激活各种防御机制。在番茄中，多项研究表明，一种名为系统素的18个氨基酸的肽是系统性诱导对咀嚼式植物害虫直接抗性的主要信号，并且前系统素基因（编码200个氨基酸的系统素前体）的转基因表达激活了参与植物对食草动物反应的基因。通过行为、化学和基因表达分析相结合的方法，我们报告系统素增强了生物活性挥发性化合物的产生，增加了植物对寄生蜂的吸引力，并激活了参与挥发性物质产生的基因。我们的数据表明系统素参与了番茄间接防御的系统性激活，并且我们得出结论，单个基因控制着针对害虫的协调和相关反应的系统性激活。
