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Novel genetic basis of field‐evolved resistance to Bt toxins in Plutella xylostella
Author(s) -
Baxter S. W.,
Zhao J.Z.,
Gahan L. J.,
Shelton A. M.,
Tabashnik B. E.,
Heckel D. G.
Publication year - 2005
Publication title -
insect molecular biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.955
H-Index - 93
eISSN - 1365-2583
pISSN - 0962-1075
DOI - 10.1111/j.1365-2583.2005.00563.x
Subject(s) - plutella , biology , resistance (ecology) , insecticide resistance , microbiology and biotechnology , botany , lepidoptera genitalia , toxicology , agronomy
Abstract Insecticidal toxins from Bacillus thuringiensis (Bt) are widely used to control pest insects, but evolution of resistance threatens their continued efficacy. The most common type of Bt resistance (‘Mode 1’) is characterized by recessive inheritance, > 500‐fold resistance to at least one Cry1A toxin, negligible cross‐resistance to Cry1C, and reduced binding of Bt toxins to midgut membrane target sites. Mutations affecting a Cry1A‐binding midgut cadherin protein are linked to laboratory‐selected Mode 1 resistance in Heliothis virescens and Pectinophora gossypiella . Here we show that field‐evolved Mode 1 resistance in the diamondback moth, Plutella xylostella , has a different genetic basis, indicating that screening for resistance in the field should not be restricted to a previously proposed DNA‐based search for cadherin mutations.