Fig. 3

Chromosome fusions during the evolution of Brachypodium. Chromosomes, shown as rectangular blocks, are arranged horizontally and vertically to the dot-plot. The color scheme (A1-A7, the seven ancestral chromosomes was used seven different colors as reference were related to chromosomes in different grasses) for the chromosomes of grasses follows that of a previous study [19]. Homologous blocks can be classified as primary, resulting from chromosomal orthology, and secondary, resulting from paralogy from ancestral polyploidy. Bd, Brachypodium distachyon; Os, Oryza sativa. a Formation of chromosome Bd1; b formation of chromosome Bd2; c formation of chromosome Bd3; d formation of chromosome Bd4