Terpene Chemistry of Eastern Hemlocks Resistant to Hemlock Woolly Adelgid
Terpene Chemistry of Eastern Hemlocks Resistant to Hemlock Woolly Adelgid
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DOI：
10.1007/s10886-014-0495-0
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发表时间：
2014-09-01
影响因子：
2.3
通讯作者：
Mayer, Mark
中科院分区：
文献类型：
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作者：
McKenzie, E. Alexa;Elkinton, Joseph S.;Mayer, Mark
最近的研究发现了少数个体的东部铁杉树，它们对引入的食树液昆虫铁杉绵球蚜表现出相对的抗性。使用气相色谱法，我们比较了敏感和相对耐药的树木，无论是在森林中，并在一个共同的花园设置繁殖插条22萜类化合物的浓度。萜类化合物的浓度较高的枝条组织的抗性与敏感的树木，在6个采样日期，在这两个网站。这些变化可能特别重要，因为铁杉绵球蚜以小枝组织为食。由于普通花园插条是免费的食草动物，较高的萜类化合物浓度被解释为组成防御。单萜和倍半萜的水平增加意味着两种萜类化合物合成途径的碳前体输入的总体增加。
Recent studies have identified a small number of individual eastern hemlock trees that demonstrate relative resistance to the introduced sap-feeding insect, the hemlock woolly adelgid. Using gas chromatography, we compared concentrations of twenty-two terpenoids in susceptible and relatively resistant trees, both in the forest and in propagated cuttings in a common-garden setting. Terpenoid concentrations were higher in twig tissue of resistant versus susceptible trees, across six sampling dates and at both sites. These changes may be particularly important because the hemlock woolly adelgid feeds on twig tissue. Because the common-garden cuttings were free of herbivores, the higher terpenoid concentrations are interpreted as a constitutive defense. Increased levels of monoterpenes and sesquiterpenes imply an overall increase in the input of carbon precursors to both terpenoid synthesis pathways.