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Marcussen, T.* ; Sandve, S.R.* ; Heier, L.* ; Spannagl, M. ; Pfeifer, M. ; International Wheat Genome Sequencing Consortium (*) ; Jakobsen, K.S.* ; Wulff, B.B.* ; Steuernagel, B.* ; Mayer, K.F.X. ; Olsen, O.A.*

Ancient hybridizations among the ancestral genomes of bread wheat.

Science 345:1250092 (2014)
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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 ~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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Publication type Article: Journal article
Document type Scientific Article
ISSN (print) / ISBN 0036-8075
e-ISSN 1095-9203
Journal Science
Quellenangaben Volume: 345, Issue: 6194, Pages: , Article Number: 1250092 Supplement: ,
Publisher American Association for the Advancement of Science (AAAS)
Reviewing status Peer reviewed