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Elm bark components and their potential influence on bark beetle feeding

机译：榆树皮成分及其对树皮甲虫摄食的潜在影响

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In order to better understand the chemical factors involved in the host feeding selectivity by Scolytus, components were extracted from elm bark and studied. Sampled trees were located in an elm stand that survived the Dutch twig elm disease pandemia, and from elm clones from throughout the Iberian Peninsula. The main samples studied were from Ulmus minor, and the other samples from U. pumila, U. laevis and several hybrids. The main compounds in the extracts obtained from current-year twigs were aliphatic hydrocarbons (particularly heptacosane and nonacosane) and from 2- to 4-year-old stems were triterpenes. Three of the triterpenes were identified for the first time in Ulmus (lupenol, alnulin, and ilexol) and two in Ulmaceae (moretenol and betulin). Differences occurred in the compounds isolated from U. minor from the two locations, and between species.
机译：为了更好地了解Scolytus参与宿主进食选择性的化学因素，从榆树皮中提取了成分并进行了研究。取样的树木位于榆树枝架上，该树枝可以从荷兰树枝榆疾病大流行中幸存下来，并且来自整个伊比利亚半岛的榆树克隆。研究的主要样品来自Ulmus minor，其他样品来自U. pumila，U。laevis和几种杂种。从当年的树枝中提取的提取物中的主要化合物是脂肪烃（尤其是庚烷和壬二烷），而从2至4岁的茎中则是三萜。在乌尔姆斯首次鉴定出三萜（三萜）（羽扇豆酚，alnulin和ilexol），在乌贼科中首次鉴定出三萜（摩尔多酚和白桦醇）。从这两个地点以及物种之间从小U.us分离的化合物之间存在差异。

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