The genome and stage-specific transcriptomes of the carrot weevil, Listronotus oregonensis, reveal adaptive mechanisms for host specialisation and symbiotic interactions.
Ste-Croix DT, Gagnon AÈ, Mimee B
Summary
PubMedWhy it matters This matters because carrot weevils can devastate home and commercial carrot crops with no fully effective control method — understanding their genetic weaknesses could lead to smarter, more targeted ways to protect your vegetable garden.
Researchers mapped out the complete genetic blueprint of the carrot weevil, a beetle that loves to destroy carrot crops. They found it has surprisingly few 'smell sensors' — which explains why it only attacks a narrow set of plants — but a surprisingly large toolkit of genes for breaking down plant poisons, helping it survive in the plants it does target. They also discovered the weevil carries a common insect bacteria called Wolbachia and has borrowed some genes from bacteria over its evolutionary history, including ones that help it digest plant cell walls.
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Scientists decoded the full genome of the carrot weevil, a destructive crop pest, revealing why it targets such a narrow range of plants and how it survives plant chemical defenses. The findings open new doors for developing targeted pest control strategies.
Key Findings
The genome contains 14,637 annotated genes; only 24 odorant-binding proteins and 41 sensory receptor genes were found — unusually low numbers that likely explain the weevil's narrow host-plant range.
Detoxification gene families show significant expansion compared to other species, suggesting a strong evolutionary adaptation to neutralize plant chemical defenses.
46 genes were likely acquired via horizontal gene transfer from bacteria, including cell-wall degrading enzymes, and a toxin gene shows evidence of ancient bacterial origin followed by spread within the weevil family.
Abstract Preview
Throughout their evolution, insects have become specialised to occupy diverse ecological niches. The carrot weevil, Listronotus oregonensis, is an important agricultural pest that exhibits a very s...
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