The role of 20-hydroxyecdysone in housefly sex pheromone biosynthesis |
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Authors: | T.S. Adams J.W. Dillwith G.J. Blomquist |
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Affiliation: | 1. Metabolism and Radiation Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Fargo, North Dakota 58105 U.S.A.;2. Department of Biochemistry, University of Nevada, Reno, Nevada 89557, U.S.A. |
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Abstract: | Houseflies ovariectomized within 12 h after emergence do not produce (Z)-9-tricosene nor demonstrate the shift from alkene to alkane synthesis that is typcal of flies with developing ovaries. A single injection of 20-hydroxyecdysone at doses of 0.1 to 10 μg will induce the pattern in ovariectomized insects that is characteristic of flies with ovaries. Furthermore, this pattern persists for 3 days, but by 6 days after hormone injection, the synthesis of (Z)-9-tricosene stops and more alkenes are produced than alkanes. A post-hormone treatment time of 16 h was required before detectable amounts of (Z)-9-tricosene appeared on ovariectomized flies. Multiple injections of 20-hydroxyecdysone at doses of 50 ng into ovariectomized flies induced (Z)-9-tricosene synthesis and a shift in alkene to alkane synthesis. Thus, 20-hydroxyecdysone was able to act as an ovarian substitute in ovariectomized flies by stimulating pheromone synthesis. |
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Keywords: | Methylalkanes hydrocarbon biosynthesis |
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