Overexpression of a cytochrome P450 monooxygenase, CYP6ER1, is associated with resistance to imidacloprid in the brown planthopper, Nilaparvata lugens

A - Papers appearing in refereed journals

Bass, C. G., Carvalho, R. A., Oliphant, L., Puinean, A. M., Field, L. M., Nauen, R., Williamson, M. S., Moores, G. D. and Gorman, K. 2011. Overexpression of a cytochrome P450 monooxygenase, CYP6ER1, is associated with resistance to imidacloprid in the brown planthopper, Nilaparvata lugens. Insect Molecular Biology. 20 (6), pp. 763-773.

AuthorsBass, C. G., Carvalho, R. A., Oliphant, L., Puinean, A. M., Field, L. M., Nauen, R., Williamson, M. S., Moores, G. D. and Gorman, K.
Abstract

The brown planthopper, Nilaparvata lugens, is an economically significant pest of rice throughout Asia and has evolved resistance to many insecticides including the neonicotinoid imidacloprid. The resistance of field populations of N. lugens to imidacloprid has been attributed to enhanced detoxification by cytochrome P450 monooxygenases (P450s), although, to date, the causative P450(s) has (have) not been identified. In the present study, biochemical assays using the model substrate 7-ethoxycoumarin showed enhanced P450 activity in several resistant N. lugens field strains when compared with a susceptible reference strain. Thirty three cDNA sequences encoding tentative unique P450s were identified from two recent sequencing projects and by degenerate PCR. The mRNA expression level of 32 of these was examined in susceptible, moderately resistant and highly resistant N. lugens strains using quantitative real-time PCR. A single P450 gene (CYP6ER1) was highly overexpressed in all resistant strains (up to 40-fold) and the level of expression observed in the different N. lugens strains was significantly correlated with the resistance phenotype. These results provide strong evidence for a role of CYP6ER1 in the resistance of N. lugens to imidacloprid.

KeywordsBiochemistry & Molecular Biology; Entomology
Year of Publication2011
JournalInsect Molecular Biology
Journal citation20 (6), pp. 763-773
Digital Object Identifier (DOI)doi:10.1111/j.1365-2583.2011.01105.x
PubMed ID21929695
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeCentre for Sustainable Pest and Disease Management (PDM)
BBSRC Institute Career Path Fellowship: A genomic approach to understanding insecticide resistance in crop pests
A genomic approach to understanding insecticide resistance in crop pests
Publisher's version
Output statusPublished
Publication dates
Online19 Sep 2011
PublisherWiley
ISSN0962-1075

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