Laboratory of Entomology, Wageningen University, P.O. Box 8031, 6700 EH, Wageningen, the Netherlands.
J Chem Ecol. 2010 May;36(5):479-89. doi: 10.1007/s10886-010-9787-1. Epub 2010 Apr 21.
The indirect defense mechanisms of plants comprise the production of herbivore-induced plant volatiles that can attract natural enemies of plant attackers. One of the often emitted compounds after herbivory is methyl salicylate (MeSA). Here, we studied the importance of this caterpillar-induced compound in the attraction of the parasitoid wasp Diadegma semiclausum by using a mutant Arabidopsis line. Pieris rapae infested AtBSMT1-KO mutant Arabidopsis plants, compromised in the biosynthesis of MeSA, were more attractive to parasitoids than infested wild-type plants. This suggests that the presence of MeSA has negative effects on parasitoid host-finding behavior when exposed to wild-type production of herbivore-induced Arabidopsis volatiles. Furthermore, in line with this, we recorded a positive correlation between MeSA dose and repellence of D. semiclausum when supplementing the headspace of caterpillar-infested AtBSMT1-KO plants with synthetic MeSA.
植物的间接防御机制包括产生能够吸引植物攻击者天敌的草食性诱导植物挥发物。在受到草食性侵害后，一种经常释放的化合物是水杨酸甲酯（MeSA）。在这里，我们通过使用拟南芥突变体线研究了这种毛毛虫诱导的化合物在吸引半闭弯尾姬蜂时的重要性。小菜蛾侵袭拟南芥 AtBSMT1-KO 突变体，该突变体在 MeSA 的生物合成中受到损害，比受侵袭的野生型植物更能吸引寄生蜂。这表明，当暴露于野生型产生的草食性诱导拟南芥挥发物时，MeSA 的存在对寄生蜂寻找宿主的行为有负面影响。此外，与此一致的是，当用合成 MeSA 补充受毛毛虫侵袭的 AtBSMT1-KO 植物的顶空时，我们记录到 MeSA 剂量与半闭弯尾姬蜂的驱避性之间存在正相关。
