期刊
SCIENCE
卷 345, 期 6194, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1250092
关键词
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资金
- Norwegian Research Council [199387]
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [1126709] Funding Source: National Science Foundation
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1338897] Funding Source: National Science Foundation
- BBSRC [BB/J003166/1, BBS/E/T/000PR6193] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BBS/E/T/000PR6193, BB/J003166/1] Funding Source: researchfish
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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