Fitness Costs and Incomplete Resistance Associated with Delayed Evolution of Practical Resistance to Bt Crops.

ABSTRACT: Insect pests are increasingly evolving practical resistance to insecticidal transgenic crops that produce Bacillus thuringiensis (Bt) proteins. Here, we analyzed data from the literature to evaluate the association between practical resistance to Bt crops and two pest traits: fitness costs and incomplete resistance. Fitness costs are negative effects of resistance alleles on fitness in the absence of Bt toxins. Incomplete resistance entails a lower fitness of resistant individuals on a Bt crop relative to a comparable non-Bt crop. In 66 studies evaluating strains of nine pest species from six countries, costs in resistant strains were lower in cases with practical resistance (14%) than without practical resistance (30%). Costs in F₁ progeny from crosses between resistant

SUBMITTER: Carriere Y 

PROVIDER: S-EPMC10051223 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature