Rapid genomic evolution in Brassica rapa with bumblebee selection in experimental evolution - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles BMC Ecology and Evolution Year : 2024

Rapid genomic evolution in Brassica rapa with bumblebee selection in experimental evolution

Abstract

Background Insect pollinators shape rapid phenotypic evolution of traits related to floral attractiveness and plant reproductive success. However, the underlying genomic changes remain largely unknown despite their importance in predicting adaptive responses to natural or to artificial selection. Based on a nine-generation experimental evolution study with fast cycling Brassica rapa plants adapting to bumblebees, we investigate the genomic evolution associated with the previously observed parallel phenotypic evolution. In this current evolve and resequencing (E&R) study, we conduct a genomic scan of the allele frequency changes along the genome in bumblebee-pollinated and hand-pollinated plants and perform a genomic principal component analysis (PCA). Results We highlight rapid genomic evolution associated with the observed phenotypic evolution mediated by bumblebees. Controlling for genetic drift, we observe significant changes in allelic frequencies at multiple loci. However, this pattern differs according to the replicate of bumblebee-pollinated plants, suggesting putative nonparallel genomic evolution. Finally, our study underlines an increase in genomic variance implying the putative involvement of multiple loci in short-term pollinator adaptation. Conclusions Overall, our study enhances our understanding of the complex interactions between pollinator and plants, providing a stepping stone towards unravelling the genetic basis of plant genomic adaptation to biotic factors in the environment.

Dates and versions

hal-04586544 , version 1 (24-05-2024)

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Léa Frachon, Florian Schiestl. Rapid genomic evolution in Brassica rapa with bumblebee selection in experimental evolution. BMC Ecology and Evolution, 2024, 24 (7), ⟨10.1186/s12862-023-02194-y⟩. ⟨hal-04586544⟩
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