A pharmacological and endocrinological study of female insemination inPhormia regina (Diptera: Calliphoridae) |
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Authors: | Brian P Evans John G Stoffolano Chih-Ming Yin Jerrold S Meyer |
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Institution: | (1) Department of Entomology, Fernald Hall, University of Massachusetts, 01003 Amherst, Massachusetts;(2) Department of Psychology, University of Massachusetts, 01003 Amherst, Massachusetts |
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Abstract: | Injections of octopamine, dopamine, and the octopaminergic agonists, clonidine and naphazoline, into the thoracic hemocoel
enhanced female insemination in sugar-fed (sexually unreceptive)Phormia regina. Topical applications of the juvenile hormone (JH) analogue, methoprene, also enhanced female insemination in sugar-fed (sexually
unreceptive)P. regina. Since JH plays a role in receptivity in protein-fed females, it was originally hypothesized that one agonist, clonidine,
enhanced female insemination by acting on the corpus allatum (CA) to increase JH biosynthesis. Two or three doses of the antiallatal
agent, precocene II, prior to administration of clonidine, did not inhibit clonidine-enhanced female insemination. Removal
of the corpus allatum also did not have a significant effect on clonidine-enhanced female insemination. Measurement of juvenile
hormone (JH) biosynthesis/release in corpora allata, which were removed at 1, 3, 5, and 7 h postinjection, revealed that clonidine
does not affect JH biosynthesis/release. Our study reveals a possible role for the biogenic amines in female insemination
in insects. We suggest that the octopaminergic agonist, clonidine, acts downstream from the corpus allatum on the regulatory
mechanisms involved in female insemination. |
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Keywords: | clonidine octopamine amines insemination juvenile hormone Phormia regina |
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