Ultra-estrutura da região anterior do intestino médio em abelhas corbiculadas (Hymenoptera: Apidae)

• Ano de defesa: 2007
• Autor(a) principal: Rönnau, Milton
• Orientador(a): Serrão, José Eduardo
• Banca de defesa: Santos, Conceição Aparecida dos , Lisboa, Luciane Cristina Oliveira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Entomologia
• Departamento: Ciência entomológica; Tecnologia entomológica
• País: BR
• Palavras-chave em Português: Abelhas corbiculadas; Ultra-estrutura; Ventrículo
• Palavras-chave em Inglês: Corbiculate bees; Ultrastructure; Ventricles
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::ZOOLOGIA::MORFOLOGIA DOS GRUPOS RECENTES
• Link de acesso: http://locus.ufv.br/handle/123456789/4002

The peritrophic membrane forms a thin layer that lines the midgut of the insects isolating the food of the midgut epithelium. The peritrophic membrane has mechanical function as well as a physical barrier against microorganisms and performs some physiological roles during food digestion. In bees the origin of peritrophic membrane is unclear and this work described the ultrastructure of the anterior midgut region in corbiculate bees for the understanding of the function of this section of the digestive tract. The species studied were Apis mellifera, Melipona quadrifasciata nanthidioides, Bombus morio and Euglossa. townsendi. The results showed that the anterior midgut region is a specialized strucuture only in Meliponini that has cells tall and thin. Meanwhile in Melipona quadrifasciata anthidioides and the others studied species cells of this midgut region show ultrastrucutural features of digestive cells. The basal plasma membrane infoldings have many openings to the haemocel, suggesting an absorption role in this midgut region. The anterior midgut region of bees is characterized for the presence of the cardiac valve, a foregut section that protrudes into the midgut. The cells of the anterior midgut region of Meliponini (cardia), despite be a section anatomically and histologically differentiated, has cells with ultrastructure featrures similar to those of Bombini and Apini, and they may play a role in water and food absorption.