11/9/2022 0 Comments Ornatrix uving![]() ![]() This result indicated that 3,6,9-21:Hy could be biosynthesized from linolenic acid through chain elongation and decarboxylation. When the labeled precursor, D 4-9,12,15-18:acid, was injected into the early pupal stage, the most abundantly labeled hydrocarbons were 3,6,9-21:Hy and 1,3,6,9-21:Hy in the female adults. A pheromone biosynthesis activating neuropeptide (PBAN)-like neuropeptide did not affect sex pheromone production as indicated by injection of synthetic PBAN and decapitation of U. Decapitated female moths accumulated 3,6,9-21:Hy and 1,3,6,9-21:Hy compared to the same age normal females, indicating that female moths continuously produce pheromone. This result could indicate that two distinct populations are present in our original collection site in Florida. In our population of females (several hundred sampled), approximately 90% produced the tetraene, 1,3,6,9-21:Hy, as the major component, while the other 10% produced only a large amount (1500–2000 ng) of 3,6,9-21:Hy, with no detectable amount of the tetraene. Both compounds were detected in pheromone glands of newly emerged adults, with low amounts found in the late pupal stage, indicating that sex pheromone biosynthesis started in the late pupal stage. Analysis of Utetheisa ornatrix females by gas chromatography-mass spectrometry and measurement of responses of male moths by coupled gas chromatography-electroantennogram detection confirmed the presence of large amounts of ( Z, Z, Z)-1,3,6,9-heneicosatetraene (1,3,6,9-21:Hy) and smaller amounts of ( Z, Z, Z)-3,6,9-heneicosatriene (3,6,9-21:Hy). The type II class of sex pheromones found in moths is composed of polyene hydrocarbons and their epoxides. ![]()
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