Publication Date:
2014-07-19
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marcussen, Thomas -- Sandve, Simen R -- Heier, Lise -- Spannagl, Manuel -- Pfeifer, Matthias -- International Wheat Genome Sequencing Consortium -- Jakobsen, Kjetill S -- Wulff, Brande B H -- Steuernagel, Burkhard -- Mayer, Klaus F X -- Olsen, Odd-Arne -- New York, N.Y. -- Science. 2014 Jul 18;345(6194):1250092. doi: 10.1126/science.1250092.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Sciences, Norwegian University of Life Sciences, 1432 As, Norway. ; Department of Plant Sciences, Norwegian University of Life Sciences, 1432 As, Norway. simen.sandve@nmbu.no. ; Stromsveien 78 B, 0663 Oslo, Norway. ; Plant Genome and Systems Biology, Helmholtz Center Munich, Ingolstadter Landstrasse 1, 85764 Neuherberg, Germany. ; Centre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, 0316 Oslo, Norway. ; The Sainsbury Laboratory, Norwich Research Park, Norwich NR4 7UH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25035499" target="_blank"〉PubMed〈/a〉
Keywords:
*Bread
;
*Evolution, Molecular
;
Genes, Plant
;
*Genome, Plant
;
*Hybridization, Genetic
;
Phylogeny
;
Polyploidy
;
Triticum/classification/*genetics
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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