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Pervasive hybridizations in the history of wheat relatives

Abstract : Cultivated wheats are derived from an intricate history of three genomes, A, B, and D, present in both diploid and polyploid species. It was recently proposed that the D genome originated from an ancient hybridization between the A and B lineages. However, this result has been questioned, and a robust phylogeny of wheat relatives is still lacking. Using transcriptome data from all diploid species and a new methodological approach, our comprehensive phylogenomic analysis revealed that more than half of the species descend from an ancient hybridization event but with a more complex scenario involving a different parent than previously thought—Aegilops mutica, an overlooked wild species—instead of the B genome. We also detected other extensive gene flow events that could explain long-standing controversies in the classification of wheat relatives.
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Sylvain Glémin, Celine Scornavacca, Jacques Dainat, Concetta Burgarella, Veronique Viader, et al.. Pervasive hybridizations in the history of wheat relatives. Science Advances , American Association for the Advancement of Science (AAAS), 2019, 5 (5), pp.eaav9188. ⟨10.1126/sciadv.aav9188⟩. ⟨hal-02144799⟩

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