Morphological Changes in the Midgut of Aedes aegypti L. (Diptera: Culicidae) Larvae Following Exposure to an Annona coriacea (Magnoliales: Annonaceae) Extract |
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Authors: | MS Costa DO Pinheiro JE Serr?o MJB Pereira |
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Institution: | 1. Depto de Ci??ncias Biol??gicas, UNEMAT, Tangar?? da Serra, Mato Grosso, Brasil 3. Univ de Cuiab??, UNIC, Tangar?? da Serra, Mato Grosso, Brasil 4. Depto de Biologia Geral, UFV, Vi?osa, Minas Gerais, Brasil 2. Depto de Agronomia, UNEMAT, Rodovia MT 358, Km 07, Jardim Aeroporto, Cep: 78300-000, Tangar?? da Serra, Mato Grosso, Brasil
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Abstract: | Bioinsecticides are important in the control of disease vectors, but data regarding their physiological effects on target insects are incomplete. This study describes morphological changes that occur in the midgut of third instar Aedes aegypti L. (Diptera: Culicidae) following treatment with a methanolic extract of Annona coriacea (Magnoliales: Annonaceae). Dissected midguts were subdivided into anterior and posterior regions and analyzed by light and scanning electron microscopy. Insects exposed to the extract displayed intense, destructive cytoplasmic vacuolization in columnar and regenerative midgut cells. The apical surfaces of columnar cells exhibited cytoplasmic protrusions oriented toward the lumen, suggesting that these cells could be involved in apocrine secretory processes and/or apoptosis. We report that A. coriacea extracts induced morphological alterations in the midgut of A. aegypti midgut larvae, supporting the use of plant extracts for control of the dengue vector. |
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