Ancient hybridizations among the ancestral genomes of bread wheat

0441342 - ÚEB 2015 RIV US eng J - Journal Article
Marcussen, T. - Sandve, S. R. - Heier, L. - Spannagl, M. - Pfeifer, M. - Rogers, J. - Doležel, Jaroslav - Pozniak, C. - Eversole, K. - Feuillet, C. - Gill, B. - Friebe, B. - Lukaszewski, A.J. - Sourdille, P. - Endo, T. R. - Kubaláková, Marie - Čihalíková, Jarmila - Dubská, Zdeňka - Vrána, Jan - Šperková, Romana - Šimková, Hana - Febrer, M. - Clissold, L. - Jakobsen, K. S. - Wulff, B.H. - Steuernagel, B. - Mayer, K. F. X. - Olsen, O.A. … Total 105 authors
Ancient hybridizations among the ancestral genomes of bread wheat.
Science. Roč. 345, č. 6194 (2014). ISSN 0036-8075. E-ISSN 1095-9203
Institutional support: RVO:61389030
Keywords : POLYPLOID WHEAT * HYBRID SPECIATION * AEGILOPS-TAUSCHII
Subject RIV: EB - Genetics ; Molecular Biology
Impact factor: 33.611, year: 2014

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.
Permanent Link: http://hdl.handle.net/11104/0244372