Eyles Alieta, Jones William, Riedl Ken, Cipollini Don, Schwartz Steven, Chan Kenneth, Herms Daniel A, Bonello Pierluigi
Department of Plant Pathology, The Ohio State University, 201 Kottman Hall, 2021 Coffey Road, Columbus, OH 43210, USA.
J Chem Ecol. 2007 Jul;33(7):1430-48. doi: 10.1007/s10886-007-9312-3.
Recent studies have investigated interspecific variation in resistance of ash (Fraxinus spp.) to the exotic wood-boring beetle, emerald ash borer (EAB, Agrilus planipennis). Manchurian ash (Fraxinus mandshurica) is an Asian species that has coevolved with EAB. It experiences little EAB-induced mortality compared to North American ashes. Host phloem chemistry, both constitutive and induced, might partly explain this interspecific variation in resistance. We analyzed the constitutive phloem chemistry of three ash species: Manchurian ash and North American white (Fraxinus americana) and green (Fraxinus pennsylvanica) ash. Analysis of the crude phloem extracts revealed the presence of an array of phenolic compounds including hydroxycoumarins, a monolignol, lignans, phenylethanoids, and secoiridoids. Both qualitative and quantitative differences were observed among the three ash species. Hydroxycoumarins and the phenylethanoids, calceloariosides A and B, were present only in the phloem of Manchurian ash and might represent a mechanism of resistance against EAB.
最近的研究调查了白蜡树（水曲柳属）对外来蛀木甲虫——翡翠灰螟（EAB，光肩星天牛）抗性的种间差异。水曲柳是一种与翡翠灰螟共同进化的亚洲物种。与北美白蜡树相比，它受翡翠灰螟侵害导致的死亡率较低。宿主韧皮部的化学成分，包括组成型和诱导型的，可能部分解释了这种抗性的种间差异。我们分析了三种白蜡树的组成型韧皮部化学成分：水曲柳以及北美白蜡树（美国白蜡树）和绿梣（毛果白蜡树）。对粗韧皮部提取物的分析显示存在一系列酚类化合物，包括羟基香豆素、一种单木质醇、木脂素、苯乙醇类化合物和裂环烯醚萜类化合物。在这三种白蜡树之间观察到了定性和定量上的差异。羟基香豆素以及苯乙醇类化合物、水曲柳苷A和B仅存在于水曲柳的韧皮部中，可能代表了一种抵御翡翠灰螟的机制。
