title: Lufenuron impact upon Anthonomus grandis Boheman (Coleoptera: Curculionidae) midgut and its reflection in gametogenesis.
abstract: The insecticide Match® (lufenuron), one of the main insect growth regulators used in pest control, has been presented as a viable alternative against the boll weevil, Anthonomus grandis (Coleoptera: Curculionidae), by inhibiting chitin synthesis. Thus, this study aimed to examine whether Match® interferes in the synthesis of the peritrophic matrix, leading to changes in the midgut epithelium, resulting in nutritional deficiency and reflecting, thereby, in the gametogenesis process of A. grandis. Floral cotton buds were immersed in the insecticide solution (800μL of Match®+200mL of distilled water) and offered to the adult insects. The midguts of the insects were evaluated after 24 and 120h after feeding. The gonads were evaluated after 120h. The results showed that Match®, in both evaluation periods, induced histopathological alterations such as disorganization, vacuolization and desquamation of the midgut epithelium; histochemical modifications in the distribution patterns of carbohydrates, although without quantitative changes; and a strong decrease in protein levels. No apoptosis were observed, however, there was an increase in the number of regenerative cell nests. In the testicles, a reduction in the amount of spermatozoids and reduced carbohydrate levels were observed, but no difference in protein levels. The ovarioles presented structural disorganization of follicular cells, yolk reduction and decrease in protein levels, however, no change in carbohydrates levels was noted. Therefore, it is concluded that Match® performs histopathologic and histochemical alterations in the midgut epithelium and the gonads of A. grandis adults, reflecting in the gametogenesis process, presenting itself as a promising tool in the management of this pest on cotton crops.
authors.affiliation: Federal Rural University of Pernambuco, Department of Agronomy- Entomology, Dom Manoel de Medeiros Ave., Dois Irmãos, 52171-900 Recife, PE, Brazil.
authors.forename: Hilton Nobre
authors.initials: HN
authors.lastname: Costa
authors.affiliation: Frassineti School of Recife, Department of Biology, Conde da Boa Vista Avenue, 50060-002 Recife, PE, Brazil.
authors.forename: Franklin Magliano
authors.initials: FM
authors.lastname: da Cunha
authors.affiliation: Federal Rural University of Pernambuco, Department of Agronomy- Entomology, Dom Manoel de Medeiros Ave., Dois Irmãos, 52171-900 Recife, PE, Brazil. Electronic address: nanebiologa@hotmail.com.
authors.forename: Glaucilane Santos
authors.initials: GS
authors.lastname: Cruz
authors.affiliation: Federal Rural University of Pernambuco, Department of Animal Morphology and Physiology, Dom Manoel de Medeiros Ave., Dois Irmãos, 52171-900 Recife, PE, Brazil.
authors.forename: Carolline Guimarães
authors.initials: CG
authors.lastname: D'assunção
authors.affiliation: Federal Rural University of Pernambuco, Department of Agronomy- Entomology, Dom Manoel de Medeiros Ave., Dois Irmãos, 52171-900 Recife, PE, Brazil.
authors.forename: Guilherme Gomes
authors.initials: GG
authors.lastname: Rolim
authors.affiliation: Federal Rural University of Pernambuco, Department of Animal Morphology and Physiology, Dom Manoel de Medeiros Ave., Dois Irmãos, 52171-900 Recife, PE, Brazil.
authors.forename: Maria Edna Gomes
authors.initials: ME
authors.lastname: Barros
authors.affiliation: Federal Rural University of Pernambuco, Department of Agronomy- Entomology, Dom Manoel de Medeiros Ave., Dois Irmãos, 52171-900 Recife, PE, Brazil.
authors.forename: Mariana Oliveira
authors.initials: MO
authors.lastname: Breda
authors.affiliation: Federal Rural University of Pernambuco, Department of Animal Morphology and Physiology, Dom Manoel de Medeiros Ave., Dois Irmãos, 52171-900 Recife, PE, Brazil.
authors.forename: Alvaro Aguiar Coelho
authors.initials: AA
authors.lastname: Teixeira
authors.affiliation: Federal Rural University of Pernambuco, Department of Animal Morphology and Physiology, Dom Manoel de Medeiros Ave., Dois Irmãos, 52171-900 Recife, PE, Brazil.
authors.forename: Valéria Wanderley
authors.initials: VW
authors.lastname: Teixeira
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D001549:Benzamides; D004064:Digestive System / Q000187:drug effects* / Q000473:pathology; D005260:Female; D005718:Gametogenesis / Q000187:drug effects*; D007150:Immunohistochemistry; D007306:Insecticides; D008297:Male; D010053:Ovary / Q000187:drug effects / Q000254:growth & development / Q000473:pathology; D013737:Testis / Q000187:drug effects / Q000254:growth & development / Q000473:pathology; D048889:Weevils / Q000254:growth & development / Q000502:physiology*; D005466:Fluorocarbons
chemical_list: D001549:Benzamides; D007306:Insecticides; C070364:fluphenacur; D005466:Fluorocarbons
keywords: Apoptosis; Benzoylurea; Boll weevil; Cotton; Growth regulator; Peritrophic membrane