Control of Cuticle Formation in Wing Epidermal Cells of the Fleshfly, Sarcophaga bullate : Developmental Biology

概要

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Insect wing epidermis forms either pupal type or adult type cuticle depending on its developmental stage. To study the control of this stage-specific cuticle formation, we examined the type of cuticle formed by wing discs or pupal wings transplanted into larvae or pupae and subjected to larval-pupal and/or pupal-adult metamorphosis. Following transplantation into larvae, the type of cuticle formed by wing discs and by pupal wings was always the same; both formed only pupal cuticle if recovered from their hosts immediately after larval-pupal metamorphosis, and formed both pupal and adult cuticles if recovered from the hosts after pupal-adult metamorphosis was completed. On the other hand, following transplantation into pupae, the type of cuticle formed by wing discs and by pupal wings was different; wing discs formed only adult cuticle along with the pupal-adult metamorphosis of the hosts, whereas pupal wings formed both pupal and adult cuticles under the same condition. Wings transplanted from late prepupae into pupae also formed both pupal and adult cuticles. These results demonstrate that the type of cuticle formed by wing epidermis depends not only on hormonal conditions but also on the developmental stage of the epidermal cells.
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