Ancient hybridizations among the ancestral genomes of bread wheat.
Science
; 345(6194): 1250092, 2014 Jul 18.
Article
em En
| MEDLINE
| ID: mdl-25035499
ABSTRACT
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.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Triticum
/
Pão
/
Genoma de Planta
/
Evolução Molecular
/
Hibridização Genética
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article