Regulation of Sex Pheromone Biosynthesis in Three Plusiinae Moths:<i>Macdunnoughia confusa</i>,<i>Anadevidia peponis</i>, and<i>Chrysodeixis eriosoma</i>
作者:Mitsuaki KOMODA、Shin-ichi INOMATA、Akihiko ONO、Hayaki WATANABE、Tetsu ANDO
DOI:10.1271/bbb.64.2145
日期:2000.1
Virgin females of M. confusa, A. peponis, and C. eriosoma secrete (Z)-7-dodecenyl acetate as a common main pheromone component. Their pheromone titers decreased after decapitation, and increased in the decapitated females after injection of a synthetic hormone, pheromone biosynthetic activating neuropeptide (PBAN) of Bombyx mori. In addition, an extract of brain-subesophageal ganglion complexes of each Plusiinae species activated pheromone biosynthesis in decapitated females of not only the corresponding species, but also that of Mamestra brassicae. These results indicate that pheromone biosynthesis of the three Plusiinae species is also controlled by a PBAN-like substance. However, the Plusiinae females exceptionally contained remarkable amounts of the pheromone even 1 day after decapitation. Since it has been reported that pheromones completely disappear at least 1 day after decapitation in females of many other lepdidoptran species including B. mori and M. brassicae, a different mechanism is likely regarding the regulation of the studied Plusiinae pheromone biosynthesis. Furthermore, an incorporation experiment with a labeled pheromone precursor, D9-(Z)-7-dodecenoic acid, showed that moderate biosynthesis still proceeded in the pheromone glands of M. confusa females 1 day after decapitation, providing an evidence why complete disappearance of the pheromone was not observed in the females which otherwise lacked a source of the pheromonotropic neuropeptide.
M.confusa、A. peponis和C. eriosoma的处女雌虫分泌的(Z)-7-十二烯基乙酸酯是共同的主要信息素成分。它们的信息素滴度在断头后下降,而在注射一种合成激素--森雌黄蜂的信息素生物合成激活神经肽(PBAN)后,断头雌黄蜂的信息素滴度上升。此外,每种加氏蝇科昆虫的脑-食管下神经节复合体提取物不仅能激活相应物种雌虫的信息素生物合成,还能激活黄铜蝇科昆虫雌虫的信息素生物合成。这些结果表明,这三种Plusiinae的信息素生物合成也受PBAN类物质的控制。然而,Plusiinae 雌虫在断头后 1 天仍然含有大量的信息素。据报道,许多其他鳞翅目昆虫(包括 B. mori 和 M. brassicae)的雌性在断头后至少 1 天信息素会完全消失,因此所研究的 Plusiinae 信息素生物合成的调控机制可能与此不同。此外,用标记的信息素前体 D9-(Z)-7-dodecenoic acid 进行的掺入实验表明,在断头 1 天后,M. confusa 雌虫的信息素腺体中仍在进行适度的生物合成,这为在缺乏信息素神经肽来源的雌虫体内没有观察到信息素完全消失提供了证据。