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Ancient hybridizations among the ancestral genomes of bread wheat

T. Marcussen 1 S. Sandve 1 L. Heier 2 M. Spannagl 3, 4 M. Pfeifer 4, 3 K. Jakobsen B. Wulff 5 B. Steuernagel 5 K. Mayer 3, 4 O.-A. Olsen J. Rogers J. Dole el C. Pozniak K. Eversole 6 C. Feuillet 7 B. Gill B. Friebe A. Lukaszewski Pierre Sourdille 8 T. Endo M. Kubalakova 9 J.  ihalikova Z. Dubska J. Vrana 9 R.  perkova H.  imkova M. Febrer L. Clissold K. Mclay K. Singh 10 P. Chhuneja N. Singh J. Khurana E. Akhunov F. Choulet 11, 8 A. Alberti 12 Valérie Barbe 13 P. Wincker 14 H. Kanamori 15 F. Kobayashi T. Itoh T. Matsumoto 16 H. Sakai 17 T. Tanaka 18 J. Wu 19 Y. Ogihara H. Handa P. Maclachlan A. Sharpe D. Klassen D. Edwards J. Batley 20 S. Lien 1 M. Caccamo S. Ayling R. Ramirez-Gonzalez B. Clavijo J. Wright 21 M. Martis M. Mascher J. Chapman J. Poland U. Scholz K. Barry R. Waugh D. Rokhsar G. Muehlbauer N. Stein 22 H. Gundlach M. Zytnicki V. Jamilloux 23 H. Quesneville 23 T. Wicker 24 P. Faccioli M. Colaiacovo A. Stanca H. Budak L. Cattivelli 25 N. Glover 8 L. Pingault 8 E. Paux 8 S. Sharma 26 R. Appels 27 M. Bellgard 28 B. Chapman 29 T. Nussbaumer 30 K. Bader H. Rimbert 31 S. Wang R. Knox A. Kilian 32 M. Alaux F. Alfama L. Couderc N. Guilhot 8 C. Viseux M. Loaec B. Keller 33 S. Praud 34
Abstract : The allohexaploid bread wheat genome consists of three closely related subgenomes (A, B, and D), but a clear understanding of their phylogenetic history has been lacking. We used genome assemblies of bread wheat and five diploid relatives to analyze genome-wide samples of gene trees, as well as to estimate evolutionary relatedness and divergence times. We show that the A and B genomes diverged from a common ancestor similar to 7 million years ago and that these genomes gave rise to the D genome through homoploid hybrid speciation 1 to 2 million years later. Our findings imply that the present-day bread wheat genome is a product of multiple rounds of hybrid speciation (homoploid and polyploid) and lay the foundation for a new framework for understanding the wheat genome as a multilevel phylogenetic mosaic.
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Submitted on : Friday, July 3, 2020 - 3:05:45 PM
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T. Marcussen, S. Sandve, L. Heier, M. Spannagl, M. Pfeifer, et al.. Ancient hybridizations among the ancestral genomes of bread wheat. Science, American Association for the Advancement of Science, 2014, 345 (6194), pp.1250092-1250092. ⟨10.1126/science.1250092⟩. ⟨hal-02889053⟩

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