Population expansion and genomic adaptation to agricultural environments of the soybean looper, Chrysodeixis includens

Evolutionary studies of insect pests improve our ability to anticipate problems in agricultural ecosystems, such as pest outbreaks, control failures, or expansions of the host range. Here, we investigated the mechanisms underlying the evolutionary processes behind the recent census size expansion an...

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Bibliographic Details
Published in:Evolutionary applications 2020-09, Vol.13 (8), p.2071-2085
Main Authors: Silva, Cleane S., Cordeiro, Erick M.G., Paiva, Julia B., Dourado, Patrick M., Carvalho, Renato A., Head, Graham, Martinelli, Samuel, Correa, Alberto S.
Format: Article
Language:English
Subjects:
Adaptation
Agricultural ecosystems
Agriculture
Chrysodeixis includens
Cotton
Cytochrome
demography
Deoxyribonucleic acid
Digestive enzymes
DNA
Evolution
Farming
Genetic diversity
Genetic structure
Genotyping
Host plants
Host range
insect adaptation
Insects
Landscape
landscape genetics
Mitochondria
Noctuidae
Original
Pest outbreaks
Pests
Population
Population differentiation
Positive selection
Satellites
selection
Soybeans
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Summary:Evolutionary studies of insect pests improve our ability to anticipate problems in agricultural ecosystems, such as pest outbreaks, control failures, or expansions of the host range. Here, we investigated the mechanisms underlying the evolutionary processes behind the recent census size expansion and local adaptation of Chrysodeixis includens. First, we sequenced mitochondrial markers to conduct a phylogeographic investigation of C. includens historical processes. Then, we combined a de novo genotyping‐by‐sequencing approach with a study of agricultural landscapes to uncover recent processes of adaptation. Primarily, we found low genetic diversity across all markers and clear indications of a recent demographic expansion. We also found a lack of significant isolation by distance (IBD), and weak or absent genetic structure considering geographic locations. However, we did find initial signs of population differentiation that were associated with host plant types (i.e., soybean and cotton). Agricultural landscape attributes, including soybean crops, were significantly associated with putative markers under positive selection. Moreover, positive selection associated with host differentiation was putatively linked to digestive enzymes. This study showed how landscape composition and host plants can affect the evolutionary process of agricultural pest insects such as C. includens.
ISSN:1752-4571
1752-4571
DOI:10.1111/eva.12966