Arnoux, Stéphanie; Fraisse, ChristelleIST Austria ; Sauvage, Christopher
Domestication is a human‐induced selection process that imprints the genomes of domesticated populations over a short evolutionary time scale and that occurs in a given demographic context. Reconstructing historical gene flow, effective population size changes and their timing is therefore of fundamental interest to understand how plant demography and human selection jointly shape genomic divergence during domestication. Yet, the comparison under a single statistical framework of independent domestication histories across different crop species has been little evaluated so far. Thus, it is unclear whether domestication leads to convergent demographic changes that similarly affect crop genomes. To address this question, we used existing and new transcriptome data on three crop species of Solanaceae (eggplant, pepper and tomato), together with their close wild relatives. We fitted twelve demographic models of increasing complexity on the unfolded joint allele frequency spectrum for each wild/crop pair, and we found evidence for both shared and species‐specific demographic processes between species. A convergent history of domestication with gene flow was inferred for all three species, along with evidence of strong reduction in the effective population size during the cultivation stage of tomato and pepper. The absence of any reduction in size of the crop in eggplant stands out from the classical view of the domestication process; as does the existence of a “protracted period” of management before cultivation. Our results also suggest divergent management strategies of modern cultivars among species as their current demography substantially differs. Finally, the timing of domestication is species‐specific and supported by the few historical records available.
Journal of Evolutionary Biology
This work was supported by the EU Marie Curie Career Integration grant (FP7‐PEOPLE‐2011‐CIG grant agreement PCIG10‐GA‐2011‐304164) attributed to CS. SA was supported by a PhD fellowship from the French Région PACA and the Plant Breeding division of INRA, in partnership with Gautier Semences. CF was supported by an Austrian Science Foundation FWF grant (Project M 2463‐B29). Authors thank Mathilde Causse and Beatriz Vicoso for their team leading. Thanks to the Italian Eggplant Genome Consortium, which includes the DISAFA, Plant Genetics and Breeding (University of Torino), the Biotechnology Department (University of Verona), the CREA‐ORL in Montanaso Lombardo (LO) and the ENEA in Rome for providing access to the eggplant genome reference. Thanks to CRB‐lég ( https://www6.paca.inra.fr/gafl_eng/Vegetables-GRC ) for managing and providing the genetic resources, to Marie‐Christine Daunay and Alain Palloix (INRA UR1052) for assistance in choosing the biological material used, to Muriel Latreille and Sylvain Santoni from the UMR AGAP (INRA Montpellier, France) for their help with RNAseq library preparation, to Jean‐Paul Bouchet and Jacques Lagnel (INRA UR1052) for their Bioinformatics assistance.
Arnoux S, Fraisse C, Sauvage C. Genomic inference of complex domestication histories in three Solanaceae species. Journal of Evolutionary Biology. 2020. doi:10.1111/jeb.13723
Arnoux, S., Fraisse, C., & Sauvage, C. (2020). Genomic inference of complex domestication histories in three Solanaceae species. Journal of Evolutionary Biology. Wiley. https://doi.org/10.1111/jeb.13723
Arnoux, Stéphanie, Christelle Fraisse, and Christopher Sauvage. “Genomic Inference of Complex Domestication Histories in Three Solanaceae Species.” Journal of Evolutionary Biology. Wiley, 2020. https://doi.org/10.1111/jeb.13723.
S. Arnoux, C. Fraisse, and C. Sauvage, “Genomic inference of complex domestication histories in three Solanaceae species,” Journal of Evolutionary Biology. Wiley, 2020.
Arnoux S, Fraisse C, Sauvage C. 2020. Genomic inference of complex domestication histories in three Solanaceae species. Journal of Evolutionary Biology.
Arnoux, Stéphanie, et al. “Genomic Inference of Complex Domestication Histories in Three Solanaceae Species.” Journal of Evolutionary Biology, Wiley, 2020, doi:10.1111/jeb.13723.