Inheritance of resistance to Bt canola in a field-derived population of Plutella xylostella

A - Papers appearing in refereed journals

Sayyed, A. H., Schuler, T. H. and Wright, D. J. 2003. Inheritance of resistance to Bt canola in a field-derived population of Plutella xylostella. Pest Management Science. 59 (11), pp. 1197-1202. https://doi.org/10.1002/ps.754

AuthorsSayyed, A. H., Schuler, T. H. and Wright, D. J.
Abstract

Crops expressing Bacillus thuringiensis (Bt) insecticidal Cry proteins are grown on millions of hectares. Recommendations to delay resistance are based on a high expression/refugia strategy that aims to kill resistant heterozygotes and enable some susceptible insects to survive. Leaf-dip bioassays on F1 crosses of Malaysian populations of diamondback moth (Plutella xylostella (L)) showed that Cry1Ac resistance was not fully recessive. The survival of ca 50% of heterozygotes on Bt canola (Brassica napus L) leaves expressing low concentrations of Cry1Ac agreed with a non-fully-recessive model for resistance. Extrapolations based on log dose-logit mortality regressions for heterozygotes using leaf-dip bioassays showed that a relatively high level of expression, of ca 2000 ng Cry1Ac mg(-1) total leaf protein, would be required to give 90% mortality to heterozygotes. If high enough levels of expression of Bt toxin to kW heterozygotes cannot be achieved and maintained under field conditions, the effectiveness of the high-dose/refugia strategy would be reduced. (C) 2003 Society of Chemical Industry.

KeywordsAgronomy; Entomology
Year of Publication2003
JournalPest Management Science
Journal citation59 (11), pp. 1197-1202
Digital Object Identifier (DOI)https://doi.org/10.1002/ps.754
PubMed ID14620045
Open accessPublished as non-open access
Funder project or code436
509
Project: 8512
ISSN1526498X
PublisherWiley

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