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Open Access Green as soon as Postprint is submitted to ZB.
Ancient hybridizations among the ancestral genomes of bread wheat.
Science 345:1250092 (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 ~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,
Article Number: 1250092
Publisher
American Association for the Advancement of Science (AAAS)
Non-patent literature
Publications
Reviewing status
Peer reviewed