Two genomes of highly polyphagous lepidopteran pests (Spodoptera frugiperda, Noctuidae) with different host-plant ranges.

Abstract:

:Emergence of polyphagous herbivorous insects entails significant adaptation to recognize, detoxify and digest a variety of host-plants. Despite of its biological and practical importance - since insects eat 20% of crops - no exhaustive analysis of gene repertoires required for adaptations in generalist insect herbivores has previously been performed. The noctuid moth Spodoptera frugiperda ranks as one of the world's worst agricultural pests. This insect is polyphagous while the majority of other lepidopteran herbivores are specialist. It consists of two morphologically indistinguishable strains ("C" and "R") that have different host plant ranges. To describe the evolutionary mechanisms that both enable the emergence of polyphagous herbivory and lead to the shift in the host preference, we analyzed whole genome sequences from laboratory and natural populations of both strains. We observed huge expansions of genes associated with chemosensation and detoxification compared with specialist Lepidoptera. These expansions are largely due to tandem duplication, a possible adaptation mechanism enabling polyphagy. Individuals from natural C and R populations show significant genomic differentiation. We found signatures of positive selection in genes involved in chemoreception, detoxification and digestion, and copy number variation in the two latter gene families, suggesting an adaptive role for structural variation.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Gouin A,Bretaudeau A,Nam K,Gimenez S,Aury JM,Duvic B,Hilliou F,Durand N,Montagné N,Darboux I,Kuwar S,Chertemps T,Siaussat D,Bretschneider A,Moné Y,Ahn SJ,Hänniger S,Grenet AG,Neunemann D,Maumus F,Luyten I,Labadi

doi

10.1038/s41598-017-10461-4

subject

Has Abstract

pub_date

2017-09-25 00:00:00

pages

11816

issue

1

issn

2045-2322

pii

10.1038/s41598-017-10461-4

journal_volume

7

pub_type

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