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Deltamethrin resistance in the Codling Moth (Lepidoptera : Tortricidae) : Inheritance and number of genes involved

Auteurs : Bouvier (Jean-Charles), Beslay (Dominique), Sauphanor (Benoît), Boivin (Thomas), Boudinhon (Liliane) et Buès (Robert)


Année de publication : 2001
Publication : Heredity
Volume : 87
Fascicule : 4
Pagination : 456-462


Résumé :

The inheritance of deltamethrin resistance in Cydia pomonella (L.) has been investigated by crossing a resistant (Rv) and a susceptible (Sv) strain, derived from a population collected in south-eastern France in 1995. Deltamethrin resistance was suspected to be under the control of a kdr-type allele and an enhanced mixed-function oxidase (mfo). F1 and F2 progenies were therefore tested through dose-response and enzyme assays. Dose-response relationships indicated that resistance was inherited as an autosomal incompletely recessive (D = -0.199) character, involving at least two genes. Enzyme measures suggested the contribution of 1.2 genes to the expression of mfo, with incomplete dominance (D = 0.460). Our results support the hypothesis of a polygenic response to deltamethrin selection in the Rv strain, including a major kdr-type allele with a minor effect of mfos. In the light of these findings, we consider the resistance in codling moth populations in south-eastern France as a product of an adaptive sequential selection process, occurring through the sequential addition of resistance genes