VARIATIONS IN THE FREQUENCY OF ESTERASE ISOENZYMES IN TWO STRAINS OF Muscina stabulans FALLEN (DIPTERA: MUSCIDAE) TREATED WITH TWO TYPES OF INSECTICIDES
Autores
Sueli Maria Alves
Suelimariaalves@ufmt.br
Universidade Federal do Mato Grosso, Câmpus de Rondonópolis, Departamento de Biologia.
Muracy Belo
naotem@naotem.br
Universidade Estadual Paulista (UNESP), Faculdade de Ciências Agrárias e Veterinárias (FCAV), Campus de
Jaboticabal.
José Carlos Barbosa
naotem@naotem.br
Universidade Estadual Paulista (UNESP), Faculdade de Ciências Agrárias e Veterinárias (FCAV), Campus de
Jaboticabal.
Ariel David Freitas Al Gazi
naotem@naotem.br
Aluno de Pós-Graduação, Genética e Melhoramento de Plantas, UNESP-FCAV, Campus de Jaboticabal.
Resumo
The effects of two types of insecticides, a pyrethroid and a carbamate, were analyzed in twoMuscina stabulans strains after 10 selection cycles. Successive increases in the number of imagoesproduced during the selection cycles were observed for the Sarapuí strain but not for the Monte Morstrain. The genetic effects of the insecticides were investigated after the selection cycles by analysis of theesterase isoenzyme compared to control populations not submitted to the selection tests. Twenty esteraseisoenzyme patterns, divided into seven groups named A to G, were identified in the present populations.The populations treated with deltamethrine showed an increase in the frequency of group F isoenzymesand a reduction in group B enzymes. A reduction in isoenzyme frequency was observed in the populationstreated with propoxur, except for isoenzyme 19 (group G), whose frequency significantly increased in thetreated population. An increase in the number of gene amplifications for group E and D isoenzymesoccurred in two strains.
