Desenvolvimento das espermatecas durante o estágio pupal de Aedes aegypti

• Autor(a) principal: Pascini, Tales Vicari
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3995
• topic: Aedes aegypti; Inseto - Reprodução; Espermateca; Aedes aegypti; Insect - Reproduction; Spermatheca; CNPQ::CIENCIAS BIOLOGICAS::PARASITOLOGIA::ENTOMOLOGIA E MALACOLOGIA DE PARASITOS E VETORES

In general, culicid females copulate once and store sperm in one or more structures in their reproductive system named spermathecae. In Aedes aegypti, the sperm are stored during the female reproductive period into three spermathecae and are supposedly maintained by the spermathecal glandular secretions. Despite the A. aegypti spermathecae is well characterized, its development is still unknown. The present work studied the A. aegypti spermathecal development during the pupation. During the development of A. aegypti spermatheca, no morphological changes, such as those described in Drosophila melanogaster. In white pupa (just after pupation), the spermathecal primordia appears as a tiny structure that grows rapidly after 24 hours of pupation. After 48 hours of pupation, we can see the espermatecal gland, reservoir cuticular deposition and the presence of a flocculent secretion into the espermatecal duct lumen. Within 72 hours of pupation, we observe again an increase in the volume of spermathecal reservoir, this showing its cuticle layers and the same flocculent material found in the previously. This flocculent material/secretion in the early stages of development seems to assist in the spermathecal lumen development, which happens at the same time of the cuticular deposition. We have observed cell death, a process that seems to provide space for the neighbor cells to grow. Microvilli were observed in all analised periods in epithelial and glandular cells, which seems to be related to the cuticle components production by the epithelial cells or the substances secreted into the reservoir lumen through spermathecal gland. The temporal difference in the development of the reservoir and the duct (which was also observed in other insects) may happens because the espermatecal duct is formed earlier than the reservoir. In newly-emerged females, the spermathecae are already completely formed with reservoir, gland cells and duct with a thick cuticular layer and a large amount of flocculent secretion into the lumen. This secretion is believed to be originated from glandular cells to provide the essential conditions for guiding, allocating and maintaining the sperm.