Mating Success, Longevity, and Fertility of Diabrotica virgifera virgifera LeConte Chrysomelidae: Coleoptera in Relation to Body Size and Cry3Bb1-Resistant and Cry3Bb1-Susceptible GenotypesReport as inadecuate




Mating Success, Longevity, and Fertility of Diabrotica virgifera virgifera LeConte Chrysomelidae: Coleoptera in Relation to Body Size and Cry3Bb1-Resistant and Cry3Bb1-Susceptible Genotypes - Download this document for free, or read online. Document in PDF available to download.

1

North Central Agricultural Research Laboratory NCARL, USDA-ARS, 2923 Medary Ave., Brookings, SD 57006, USA

2

NCARL, USDA-ARS, 13786 Thomas Place, Keystone, SD 57751, USA

3

Department of Entomology and Wildlife Ecology, University of Delaware, Newark, DE 19716, USA



Retired.





*

Author to whom correspondence should be addressed.



Academic Editor: Astrid T. Groot

Abstract Insect resistance to population control methodologies is a widespread problem. The development of effective resistance management programs is often dependent on detailed knowledge regarding the biology of individual species and changes in that biology associated with resistance evolution. This study examined the reproductive behavior and biology of western corn rootworm beetles of known body size from lines resistant and susceptible to the Cry3Bb1 protein toxin expressed in transgenic Bacillus thuringiensis maize. In crosses between, and within, the resistant and susceptible genotypes, no differences occurred in mating frequency, copulation duration, courtship duration, or fertility; however, females mated with resistant males showed reduced longevity. Body size did not vary with genotype. Larger males and females were not more likely to mate than smaller males and females, but larger females laid more eggs. Moderately strong, positive correlation occurred between the body sizes of successfully mated males and females; however, weak correlation also existed for pairs that did not mate. Our study provided only limited evidence for fitness costs associated with the Cry3Bb1-resistant genotype that might reduce the persistence in populations of the resistant genotype but provided additional evidence for size-based, assortative mating, which could favor the persistence of resistant genotypes affecting body size. View Full-Text

Keywords: mating frequency; courtship duration; copulation duration; life history traits; leaf beetle; western corn rootworm; transgenic maize mating frequency; courtship duration; copulation duration; life history traits; leaf beetle; western corn rootworm; transgenic maize





Author: Bryan Wade French 1,* , Leslie Hammack 2,† and Douglas W. Tallamy 3

Source: http://mdpi.com/



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