Identification of Esters as Novel Aggregation Pheromone Components Produced by the Male Powder-Post Beetle, Lyctus africanus Lesne (Coleoptera: Lyctinae)
作者:Titik Kartika、Nobuhiro Shimizu、Tsuyoshi Yoshimura
DOI:10.1371/journal.pone.0141799
日期:——
Lyctus africanus is a cosmopolitan powder-post beetle that is considered one of the major pests threatening timber and timber products. Because infestations of this beetle are inconspicuous, damage is difficult to detect and identification is often delayed. We identified the chemical compounds involved in the aggregation behavior of L. africanus using preparations of crude hexanic extracts from male and female beetles (ME and FE, respectively). Both male and female beetles showed significant preferences for ME, which was found to contain three esters. FE was ignored by both the sexes. Further bioassay confirmed the role of esters in the aggregation behavior of L. africanus. Three esters were identified as 2-propyl dodecanoate, 3-pentyl dodecanoate, and 3-pentyl tetradecanoate. Further behavioral bioassays revealed 3-pentyl dodecanoate to play the main role in the aggregation behavior of female L. africanus beetles. However, significantly more beetles aggregated on a paper disk treated with a blend of the three esters than on a paper disk treated with a single ester. This is the first report on pheromone identification in L. africanus; in addition, the study for the first time presents 3-pentyl dodecanoate as an insect pheromone.
非洲木屑甲虫(Lyctus africanus)是一种广泛分布的粉虫,被认为是威胁木材和木制品的主要害虫之一。由于这种甲虫的 infestation 不易察觉,损害难以发现,识别常常延迟。我们使用来自雄性和雌性甲虫的粗六烷提取物(分别称为 ME 和 FE)识别了与 L. africanus 聚集行为相关的化学化合物。雄性和雌性甲虫均显示出对 ME 的显著偏好,ME 中发现含有三种酯。FE 则被两性甲虫忽视。进一步的生物测定确认了酯在 L. africanus 聚集行为中的作用。三种酯被识别为 2-丙基月桂酸酯、3-戊基月桂酸酯和 3-戊基十四酸酯。进一步的行为生物测定显示,3-戊基月桂酸酯在雌性 L. africanus 甲虫的聚集行为中发挥了主要作用。然而,显著更多的甲虫聚集在涂有三种酯混合物的纸盘上,而不是涂有单一酯的纸盘上。这是首次关于 L. africanus 信息素鉴定的报告; 此外,本研究首次提出 3-戊基月桂酸酯作为一种昆虫信息素。