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United States Department of Agriculture

Agricultural Research Service

Title: Shared Genetic Basis of Resistance to Bt Toxin Cry1ac in Independent Strains of Pink Bollworm

item Tabashnik, B - UNIV. AZ, TUCSON, AZ
item Liu, Yong Biao
item Unnithan, Devika - UNIV. AZ, TUCSON, AZ
item Carriere, Y - UNIV. AZ, TUCSON, AZ
item Dennehy, T - UNIV. AZ, TUCSON, AZ

Submitted to: Journal of Economic Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: February 17, 2004
Publication Date: June 20, 2004
Citation: Tabashnik, B.E., Liu, Y., Morin, S., Unnithan, D., Carriere, Y., Dennehy, T.J. Shared genetic basis of resistance to bt toxin cry1ac in independent strains of pink bollworm. Journal of Economic Entomology. 2004. v. 97. p. 721-726.

Interpretive Summary: Using feeding bioassays and molecular genetic techniques, we found that two independently derived resistant pink bollworm strains shared a same locus at which three mutant alleles confer resistance to Bt toxin Cry1Ac. The two strains were previously reported to show traits of recessive resistance, the most common mode of lepidopteran resistance to Bt toxin Cry1Ac. Offspring from crosses between the two stains were resistant to Cry1Ac indicating shared resistant locus by the two strains. PCR tests showed presence of previously identified three resistance alleles in both strains. These results suggest that the same resistance to Bt toxin Cry1Ac may be widespread in pink bollworm populations. Therefore, they may be useful for monitoring resistance to Cry1Ac-producting Bt cotton in field populations of pink bollworm.

Technical Abstract:

Last Modified: 7/31/2014
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