A - Papers appearing in refereed journals
Mallott, M., Hamm, S., Troczka, B. J., Randall, E., Pym, A., Grant, C., Baxter, S., Vogel, H., Shelton, A.M., Field, L. M., Williamson, M. S., Paine, M., Zimmer, C.T., Slater, R., Elias, J. and Bass, C. G. 2019. A flavin-dependent monooxgenase confers resistance to chlorantraniliprole in the diamondback moth, Plutella xylostella. Insect Biochemistry and Molecular Biology. 115, p. 103247.
|Authors||Mallott, M., Hamm, S., Troczka, B. J., Randall, E., Pym, A., Grant, C., Baxter, S., Vogel, H., Shelton, A.M., Field, L. M., Williamson, M. S., Paine, M., Zimmer, C.T., Slater, R., Elias, J. and Bass, C. G.|
The diamondback moth, Plutella xylostella, is a damaging pest of cruciferous crops, and has evolved resistance to many of the insecticides used for control, including members of the diamide class. Previous work on the molecular basis of resistance to diamides has documented mutations in the target-site, the ryanodine receptor, in resistant populations of P. xylostella worldwide. In contrast the role of metabolic resistance to this insecticide class is significantly less clear. Here we show that overexpression of a flavin-dependent monooxgenase (FMO) confers resistance to the diamide chlorantraniliprole in P. xylostella. Transcriptome profiling of diamide resistant strains, with and without target-site resistance, revealed constitutive over-expression of several transcripts encoding detoxification enzymes compared to susceptible strains. Two of these, CYP6BG1, and PxFMO2 were particularly highly overexpressed (33,000 and 14,700-fold, respectively) in a resistant strain (HAW) lacking target-site resistance. After 17 generations without diamide selection the resistance of the HAW strain fell by 52-fold and the expression of PxFMO2 by >1,300-fold, however, the expression of CYP6BG1 declined by only 3-fold. Generation of transgenic Drosophila melanogaster expressing these genes demonstrated that PxFMO2, but not CYP6BG1, confers resistance in vivo. Overexpression of PxFMO2 in the HAW strain is associated with mutations, including a putative transposable element insertion, in the promoter of this gene. These enhance the expression of a reporter gene when expressed in a lepidopteran cell line suggesting they are, at least in part, responsible for the overexpression of PxFMO2 in the resistant strain. Our results provide new evidence that insect FMOs can be recruited to provide resistance to synthetic insecticides.
|Keywords||Plutella xylostella ; Flavin monooxygenase; Resistance; Chlorantraniliprole; Diamide; Insecticides|
|Year of Publication||2019|
|Journal||Insect Biochemistry and Molecular Biology|
|Journal citation||115, p. 103247|
|Digital Object Identifier (DOI)||doi:10.1016/j.ibmb.2019.103247|
|Open access||Published as ‘gold’ (paid) open access|
|Online||16 Oct 2019|
|Publication process dates|
|Accepted||12 Oct 2019|
Permalink - https://repository.rothamsted.ac.uk/item/96x25/a-flavin-dependent-monooxgenase-confers-resistance-to-chlorantraniliprole-in-the-diamondback-moth-plutella-xylostella