Journal of Economic Entomology (2001) 94, 248-252

Yong-Biao Liu, Bruce E. Tabashnik, Susan K. Meyer, Yves Carrière and Alan C. Bartlett (2001)
Genetics of pink bollworm resistance to Bacillus thuringiensis toxin Cry1Ac
Journal of Economic Entomology 94 (1), 248-252
Abstract: Laboratory selection increased resistance of pink bollworm (Pectinophora gossypiella) to the Bacillus thuringiensis toxin Cry1Ac. Three selections with Cry1Ac in artificial diet increased resistance from a low level to >100-fold relative to a susceptible strain. We used artificial diet bioassays to test F₁ hybrid progeny from reciprocal crosses between resistant and susceptible strains. The similarity between F₁ progeny from the two reciprocal crosses indicates autosomal inheritance of resistance. The dominance of resistance to Cry1Ac depended on the concentration. Resistance was codominant at a low concentration of Cry1Ac, partially recessive at an intermediate concentration, and completely recessive at a high concentration. Comparison of the artificial diet results with previously reported results from greenhouse bioassays shows that the high concentration of Cry1Ac in bolls of transgenic cotton is essential for achieving functionally recessive inheritance of resistance.
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Database assignments for author(s): Yong-Biao Liu, Yves Carriere, Bruce E. Tabashnik

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pectinophora gossypiella	Cotton (Gossypium)
Bacillus thuringiensis genes in crops (entomopathogen)	Pectinophora gossypiella	Cabbage (Brassica oleracea)
Bacillus thuringiensis Cry1A-toxin (entomopathogen)	Pectinophora gossypiella	Cabbage (Brassica oleracea)