Cryptic Plutella species show deep divergence despite the capacity to hybridize

BMC Evolutionary Biology
Kym D PerrySimon W Baxter

Abstract

Understanding genomic and phenotypic diversity among cryptic pest taxa has important implications for the management of pests and diseases. The diamondback moth, Plutella xylostella L., has been intensively studied due to its ability to evolve insecticide resistance and status as the world's most destructive pest of brassicaceous crops. The surprise discovery of a cryptic species endemic to Australia, Plutella australiana Landry & Hebert, raised questions regarding the distribution, ecological traits and pest status of the two species, the capacity for gene flow and whether specific management was required. Here, we collected Plutella from wild and cultivated brassicaceous plants from 75 locations throughout Australia and screened 1447 individuals to identify mtDNA lineages and Wolbachia infections. We genotyped genome-wide SNP markers using RADseq in coexisting populations of each species. In addition, we assessed reproductive compatibility in crossing experiments and insecticide susceptibility phenotypes using bioassays. The two Plutella species coexisted on wild brassicas and canola crops, but only 10% of Plutella individuals were P. australiana. This species was not found on commercial Brassica vegetable crops, which are ro...Continue Reading

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Methods Mentioned

BETA
electrophoresis
PCR
restriction-site-associated DNA sequencing

Software Mentioned

R package pegas
HaplotypeCaller
py
R package hierfstat
DISTRUCT
parseVCF
STRUCTURE
PICARD
STRUCTURE HARVESTER
VCFtools

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