Resistance to diamide insecticides in diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae) is associated with a mutation in the membrane-spanning domain of the ryanodine receptor

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Troczka, B. J., Zimmer, C. T., Elias, J., Schorn, C., Bass, C. G., Davies, T. G. E., Field, L. M., Williamson, M. S., Slater, R. and Nauen, R. 2012. Resistance to diamide insecticides in diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae) is associated with a mutation in the membrane-spanning domain of the ryanodine receptor. Insect Biochemistry and Molecular Biology. 42, pp. 873-880.

AuthorsTroczka, B. J., Zimmer, C. T., Elias, J., Schorn, C., Bass, C. G., Davies, T. G. E., Field, L. M., Williamson, M. S., Slater, R. and Nauen, R.
Abstract

Diamide insecticides such as chlorantraniliprole and flubendiamide are a new class of insecticide that selectively target insect ryanodine receptors (RyR), a distinct class of homo-tetrameric calcium release channels which play a pivotal role in calcium homeostasis in numerous cell types. Resistance to these insecticides has recently been reported in the diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae), a global lepidopteran pest of cruciferous crops. In the present study a region of the gene encoding the proposed diamide binding site of the RyR from P. xylostella collected from the Philippines and Thailand and found to be over 200-fold resistant to both chlorantraniliprole and flubendiamide compared to susceptible strains, were amplified by RT-PCR and sequenced. Comparison of the sequence with those from several susceptible reference strains revealed non-synonymous mutations in each of the resistant strains that in both cases lead to a glycine to glutamic acid substitution (G4946E) in the protein. The independent evolution of the same amino acid substitution within a highly conserved region of the proposed diamide binding site in two geographically separated resistant strains of P. xylostella strongly suggests a causal association with diamide resistance. Furthermore we designed a pyrosequencing-based diagnostic assay for resistance monitoring purposes that can be used to detect the G4946E mutation in field-collected samples of diamondback moth. The implications of the reported findings for resistance management strategies are discussed.

Year of Publication2012
JournalInsect Biochemistry and Molecular Biology
Journal citation42, pp. 873-880
Digital Object Identifier (DOI)doi:10.1016/j.ibmb.2012.09.001
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDelivering Sustainable Systems (SS) [ISPG]
BBSRC Institute Career Path Fellowship: A genomic approach to understanding insecticide resistance in crop pests
Understanding pesticide resistance and developing sustainable crop protection strategies
Output statusPublished
Publication dates
Online13 Sep 2012
Publication process dates
Accepted05 Sep 2012
Copyright licensePublisher copyright
PublisherElsevier
ISSN0965-1748

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