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<p>Female moths of the fall webworm, <i>Hyphantria cunea</i> Drury (Lepidoptera: Erebidae), produce sex pheromones consisting of four components derived from essential fatty acids: (9<i>Z</i>,12<i>Z</i>)-9,12-octadecdienal (component <b>I</b>), (9<i>Z</i>,12<i>Z</i>,15<i>Z</i>)-9,12,15-octadecatrienal (component <b>II</b>), <i>cis</i>-9,10-epoxy-(3<i>Z</i>,6<i>Z</i>)-3,6-henicosadiene (component <b>III</b>), and <i>cis</i>-9,10-epoxy-(3<i>Z</i>,6<i>Z</i>)-1,3,6-henicosatriene (component <b>IV</b>). Intraspecific variations in the blend ratio of these components have been reported from different countries. Although the blend ratio of the sex pheromone components in these moths is known to vary depending on their host plants, the molecular mechanism remains unclear. As linoleic acid (LA) and α-linolenic acid (ALA) are essential fatty acids that cannot be de novo biosynthesized or interconverted, dietary differences in these fatty acids may affect the blend ratio of the four pheromone components produced by adult female moths of the species. We found that <i>H. cunea</i> fed on an artificial diet (group AD) in larval stage secreted more significant amounts of sex pheromone component <b>I</b> than those reared on mulberry leaves (group M). The subsequent switching-diet assay revealed that dienyl aldehyde components were generated by ingesting linoleic acid for 7&#xa0;days before pupation. Our results demonstrate that a shift in the component ratio of sex pheromones can occur within generations through diet change, not only by genetic variation.</p>

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Diet-dependent changes in body weight and sex pheromone ratio of the fall webworm, Hyphantria cunea Drury (Lepidoptera: Erebidae)

  • 期刊论文

  • 发表日期：

    2025年9月14日

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  • Takeshi Fujii,
  • Daisuke Takagi,
  • Noriyasu Ando,
  • Wataru Kojima,
  • Yuto Kitamura,
  • Hikari Hanashiro,
  • Shigeru Matsuyama,
  • Hidefumi Mitsuno,
  • Ryohei Kanzaki,
  • Takeshi Sakurai

摘要

Female moths of the fall webworm, Hyphantria cunea Drury (Lepidoptera: Erebidae), produce sex pheromones consisting of four components derived from essential fatty acids: (9Z,12Z)-9,12-octadecdienal (component I), (9Z,12Z,15Z)-9,12,15-octadecatrienal (component II), cis-9,10-epoxy-(3Z,6Z)-3,6-henicosadiene (component III), and cis-9,10-epoxy-(3Z,6Z)-1,3,6-henicosatriene (component IV). Intraspecific variations in the blend ratio of these components have been reported from different countries. Although the blend ratio of the sex pheromone components in these moths is known to vary depending on their host plants, the molecular mechanism remains unclear. As linoleic acid (LA) and α-linolenic acid (ALA) are essential fatty acids that cannot be de novo biosynthesized or interconverted, dietary differences in these fatty acids may affect the blend ratio of the four pheromone components produced by adult female moths of the species. We found that H. cunea fed on an artificial diet (group AD) in larval stage secreted more significant amounts of sex pheromone component I than those reared on mulberry leaves (group M). The subsequent switching-diet assay revealed that dienyl aldehyde components were generated by ingesting linoleic acid for 7 days before pupation. Our results demonstrate that a shift in the component ratio of sex pheromones can occur within generations through diet change, not only by genetic variation.