Structural correlation between cuticular hydrocarbons and female contact sex pheromone of German cockroachBlattella germanica (L.) |
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Authors: | Russell A Jurenka Coby Schal Edina Burns Jody Chase Gary J Blomquist |
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Affiliation: | (1) Department of Biochemistry, University of Nevada-Reno, 89557-0014 Reno, Nevada;(2) Department of Entomology and Economic Zoology, Cook College, Rutgers University, 08903 New Brunswick, New Jersey |
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Abstract: | The structural relationships between the cuticular hydrocarbons and the contact sex pheromone of the female German cockroach,Blattella germanica, were investigated. Cuticular hexane extracts were separated into hydrocarbon and ketone fractions by TLC or silicic acid column chromatography. The ketone fraction (which contains the major contact sex pheromone component) was analyzed by GC-MS before and after reduction to ydrocarbon. In addition to 3,11-dimethyl-2-nonacosanone, 3,11-dimethyl-2-heptacosanone was also identified. Females have the 3,11- and 3,9-dimethyl C27 and C29 alkanes, but only the 3,11- isomer of the dimethylketones. Inddition to the hydrocarbon components previously reported, a number of new components were characterized. Although the ratios of cuticular hydrocarbons differ among nymphs, adult males, and adult females, they have qualitatively identical hydrocarbon profiles, suggesting that the production of the contact sex pheromone results from the sex-specific oxidation of 3,11-imethylalkanes to pheromone components by the female. |
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Keywords: | Contact sex pheromone cuticular hydrocarbons 3 11-dimethyl-2-nonacosanone 3 11-dimethyl-2-heptacosanone German cockroach Blattella germanica Orthoptera Blattellidae |
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