Mar 5, 2018

Transcriptional plasticity evolution in two strains of Spodoptera frugiperda (Lepidoptera: Noctuidae) feeding on alternative host-plants

BioRxiv : the Preprint Server for Biology
Marion OrsucciNicolas Nègre

Abstract

Spodoptera frugiperda, the fall armyworm (FAW), is an important agricultural pest in the Americas and an emerging pest in sub-Saharan Africa, causing damage to major crops such as corn, sorghum and soybean. While FAW larvae are considered polyphagous, differences in diet preference have been described between two genetic variants: the Corn strain (sf-C) and the Rice strain (sf-R). These two strains are sometimes considered as distinct species, raising the hypothesis that host plant specialization might have driven their divergence. Ecological speciation takes place when the selection of divergent traits leads to the reproductive isolation of two populations. Under this hypothesis, we expect that the transcriptional response to the host plants should affect differently the fitness of the two FAW strains. We also expect that these genes should also be linked to a reproductive isolation mechanism between the strains. In this study, we performed controlled reciprocal transplant (RT) experiments to address the impact of plant diet on several traits linked to the fitness of the sf-C and sf-R strains. The phenotypical data suggest that sf-C is specialized to corn. We then used RNA-Seq to analyze the gene expression of FAW larvae from ...Continue Reading

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Mentioned in this Paper

Study
Sorghum bicolor
Diet
Crops, Agricultural
Genes
Mitochondrial Inheritance
Glycine max
Soybean preparation
Isolation Aspects
Transcription, Genetic

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