Early events in adult eye development of the moth, Manduca sexta

Journal of Insect Physiology
J Paul AlleeDavid T Champlin

Abstract

The eye imaginal disc of Manduca sexta is created early in the final larval instar from the adult eye primordium, which is composed of fully differentiated cells of the larval head capsule epidermis. Concomitant with the down-regulation of the larval epidermal program, expression of broad, a marker of pupal commitment, is activated in the primordium. The cells then detach from the cuticle, fold inward, and begin to proliferate at high levels to produce the inverted, eye imaginal disc. These and other events that begin on the first day of the final larval instar appear to mark the initiation of metamorphosis. Little is known about the endocrine control of the initiation of metamorphosis in any insect. The hemolymph titer of juvenile hormone (JH) declines to low levels during this period and the presence of JH is sufficient to repress development in cultured eye primordia. However, maintenance of JH at high levels in vivo by treatment with long-lasting JH mimics has no apparent effect on early steps in eye imaginal disc development. We discuss our findings in the context of the endocrine control of metamorphosis. The initiation of metamorphosis in Manduca, and perhaps a wide range of insect species, appears to involve the overcom...Continue Reading

References

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Citations

Jun 3, 2006·Science·Pierre Léopold, Sophie Layalle
Jul 14, 2007·Insect Biochemistry and Molecular Biology·James W Truman, Lynn M Riddiford
Feb 26, 2008·Developmental Dynamics : an Official Publication of the American Association of Anatomists·R Parthasarathy, Subba R Palli
Oct 15, 2011·Genesis : the Journal of Genetics and Development·Linlin YuFrancesca Pignoni
Sep 24, 2016·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·David S Marco Antonio, Klaus Hartfelder
Aug 28, 2020·Frontiers in Cell and Developmental Biology·Lynn M Riddiford

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