Novel genetic basis of field-evolved resistance to Bt toxins in Plutella xylostella

S. W. Baxter, J. Z. Zhao, L. J. Gahan, A. M. Shelton, B. E. Tabashnik, D. G. Heckel

Research output: Contribution to journalArticle

83 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)327-334
Number of pages8
JournalInsect Molecular Biology
Volume14
Issue number3
DOIs
StatePublished - Jun 1 2005

Keywords

  • Bacillus thuringiensis
  • Cadherin
  • Diamondback moth
  • Resistance

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Insect Science

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