Neural and hormonal control of pheromone biosynthesis in the bark beetle, Ips paraconfusus
1977; Wiley; Volume: 2; Issue: 2 Linguagem: Inglês
10.1111/j.1365-3032.1977.tb00088.x
ISSN1365-3032
AutoresPatrick Hughes, J. A. A. Renwick,
Tópico(s)Insect behavior and control techniques
ResumoABSTRACT. Synthetic juvenile hormone (JH) induced the synthesis of the three pheromones, ipsenol, ipsdienol and 2‐phenylethanol, by Ips paraconfusus males and enhanced the conversion of (–)‐α‐pinene to a fourth pheromome, cis ‐verbenol. Synthetic JH also mimicked the stimulatory effect of feeding on the metabolism of myrcene to ipsdienol and ipsenol. Implantations of corpora allata and/or corpora cardiaca from fed or newly‐emerged males into intact or decapitated males were performed. The results indicated that JH acts indirectly by stimulating the release of brain hormone, and the release of JH in unfed males is prevented by neural inhibition which is removed by the stretching of the gut during normal feeding. Failure of any hormonal treatment or gland implantation to stimulate cis ‐verbenol synthesis in the absence of exogenous α‐pinene is presented as evidence that no endogenous precursor for this pheromone is present. An apparent seasonal variation in the ability of males to produce ipsdienol and ipsenol when treated with JH was observed.
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