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Hybridization and gene flow in the mega-pest lineage of moth, Helicoverpa
- Source :
- Proceedings of the National Academy of Sciences of the United States of America
- Publication Year :
- 2018
- Publisher :
- Proceedings of the National Academy of Sciences, 2018.
-
Abstract
- Significance Helicoverpa armigera is a major agricultural and horticultural pest that recently spread from its historical distribution throughout much of the Old World to the Americas, where it is already causing hundreds of millions of dollars in damage every year. The species is notoriously quick to generate and disseminate pesticide resistance throughout its range and has a wider host range than the native Helicoverpa zea. Hybridization between the two species increases the opportunity for novel, agriculturally problematic ecotypes to emerge and spread through the Americas.<br />Within the mega-pest lineage of heliothine moths are a number of polyphagous, highly mobile species for which the exchange of adaptive traits through hybridization would affect their properties as pests. The recent invasion of South America by one of the most significant agricultural pests, Helicoverpa armigera, raises concerns for the formation of novel combinations of adaptive genes following hybridization with the closely related Helicoverpa zea. To investigate the propensity for hybridization within the genus Helicoverpa, we carried out whole-genome resequencing of samples from six species, focusing in particular upon H. armigera population structure and its relationship with H. zea. We show that both H. armigera subspecies have greater genetic diversity and effective population sizes than do the other species. We find no signals for gene flow among the six species, other than between H. armigera and H. zea, with nine Brazilian individuals proving to be hybrids of those two species. Eight had largely H. armigera genomes with some introgressed DNA from H. zea scattered throughout. The ninth resembled an F1 hybrid but with stretches of homozygosity for each parental species that reflect previous hybridization. Regions homozygous for H. armigera-derived DNA in this individual included one containing a gustatory receptor and esterase genes previously associated with host range, while another encoded a cytochrome P450 that confers insecticide resistance. Our data point toward the emergence of novel hybrid ecotypes and highlight the importance of monitoring H. armigera genotypes as they spread through the Americas.
- Subjects :
- 0301 basic medicine
Insecta
population genomics
Genome, Insect
Introgression
Moths
Helicoverpa armigera
Insect Control
Gene flow
Insecticide Resistance
selective sweep
03 medical and health sciences
Species Specificity
Commentaries
Animals
pest
hybridization
Helicoverpa
Hybrid
Genetics
Genetic diversity
Multidisciplinary
Population Biology
biology
Ecotype
Chimera
fungi
Biological Sciences
biology.organism_classification
030104 developmental biology
Insect Proteins
Helicoverpa zea
gene flow
Subjects
Details
- ISSN :
- 10916490 and 00278424
- Volume :
- 115
- Database :
- OpenAIRE
- Journal :
- Proceedings of the National Academy of Sciences
- Accession number :
- edsair.doi.dedup.....e40487dff274007040dffa5aea94b4c3
- Full Text :
- https://doi.org/10.1073/pnas.1718831115