Fig. 1

Venn diagrams showing amounts of coexpressed and specifically expressed genes of the studied allotetraploid species and their diploid progenitors. As the two allopolyploid species originated independently in different regions, and as the diploid A. acuminata shows population genetic differentiation, the analysis was conducted separately for each tetraploid species. In the coexpressed gene category, gene number in each species is given (copy-number on some loci may be different among species). Abbreviations: ARX, Arxan Mt.; QL, Qinling Mts