Ancient hybridizations among the ancestral genomes of bread wheat
By T. Marcussen, S. Sandve, Lise Heier, M. Spannagl, M. Pfeifer, K. Jakobsen, B. Wulff, B. Steuernagel, Klaus F. X. Mayer, O. Olsen. Science, 2014
708 citations recorded by the source corpus.
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.
Subfields: Plant Science
View Paper: https://www.semanticscholar.org/paper/32bb467cc544de2254ba7d0b803613279b10afb8
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In Plant Science
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Citations in the corpus
- Multiple wheat genomes reveal global variation in modern breeding (2020, methodology): “6b, Supplementary Tables 17, 18).”
- Shifting the limits in wheat research and breeding using a fully annotated reference genome (2018, background): “The postulated hybrid origin of the D subgenome, as a result of interspecific crossing with AABB tetraploid genome progenitors 1 to 2 million years after they diverged (27), is consistent with the synonymous substitution rates of homeologous gene pairs (fig.”