Fig. 2
A Results of MCSxanX showing the frequency of non-synonymous substitutions in homologous syntenic gene blocks. The large peak at ~ 0.5Ks indicates a large burst of gene duplications, consistent with the presence of an ancient whole-genome duplication. B Frackify results showing the syntenic depth of gene blocks in the Datura wrightii genome compared to Ipopmoea purpurea. The elevated number of triplicated syntenic blocks indicates an ancient hexaploidy state in D. wrightii that is not present in I. purpurea