Coordinated morphological changes in midgut, imaginal discs, and respiratory trumpets during metamorphosis of Aedes aegypti (Diptera: culicidae)
Autor(es): Nishiura, J T
Resumo: The study of mosquito metamorphosis has relevance to understanding the mosquitocidal mechanisms of juvenile hormone analogues and may provide information concerning dipteran evolution. This report details the chronology and coordination of morphological changes in imaginal disc growth and differentiation, respiratory trumpet morphogenesis, and midgut remodeling that occur during Aedes aegypti (L.) metamorphosis. These observations were facilitated by the transparent A. aegypti larval cuticle and the relatively synchronous development of individually grown larvae. The results indicate that within 12 h of the last larval-larval ecdysis, leg imaginal discs start to grow and differentiate, pupal respiratory trumpets start their morphogenesis, and midgut remodeling starts in that programmed death of midgut polytene cells and division of midgut diploid cells are initiated. Morphological changes in all of these structures continue throughout the fourth stadium and are concomitant with substantial larval feeding and growth. These observations are prerequisite to a biochemical understanding of events that occur during mosquito metamorphosis.
Palavras-Chave: Mosquito; Metamorphosis; Imaginal disc; Midgut
Imprenta: Annals of the Entomological Society of America, v. 95, n. 4, p. 498-504, 2002.
Descritores: Aedes aegypti - Cell
Data de publicação: 2002
