Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525675
Title A comparative study of metabolic effects of the corpus allatum in two adult Coleoptera, in relation to diapause
Author(s) El-Ibrashy, M.T.
Source University. Promotor(en): J. de Wilde. - Wageningen : Veenman - 65
Department(s) Laboratory of Entomology
Publication type Dissertation, internally prepared
Publication year 1965
Keyword(s) coleoptera - lymfe - excretie - secretie - klieren (dier) - lymph - excretion - secretion - glands (animal)
Categories Coleoptera
Abstract Two problems were studied: a) Whether a lower titre of the corpus allatum hormone had a different influence on the tissues of an adult insect with a diapause mechanism than on those of one without a diapause. b) Whether the metabolic effects of the corpus allatum hormone were caused mainly by its indirect influence upon an organ, e.g. the ovary, or by general influence on the metabolism as a whole. For the research two adult Coleoptera were used: the Colorado beetle (Leptinotarsa decemlineata Say) with a diapause mechanism and the yellow mealworm beetle (Tenebrio molitor L.) without such a mechanism. By tracing the influences of allatectomy or of castration on the respiration it was concluded that in both species the hormone had a gonadotropic influence in females and in♂and♀Colorado beetles also a general influence on the metabolism (direct on the basal resting respiration of active insects and probably indirect on their respiration by forced action through the central nerve system).

Further hypotheses were drafted about the location of the diapause mechanism (the flight muscles and the fat body?) and the function of the corpus allatum in the fat metabolism (probably mainly to speed the making of fatty acids unsaturated).

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