The number of WGT-derived genes in the three subgenomes of Brassiceae species and their inferred ancestral genomes. Red, blue, and green represent the number of genes (gene ratio) in the three subgenomes of the three Brasica diploids and Raphanus sativus. The red dots represent the inferred ancestral genome of Brassiceae species (ABrassiceae) and the ancestral genome of B. rapa and B. oleracea (ABra_Bol). The pink lines indicate B. rapa speciation and intraspecific diversification. This figure is based on information published previously by Cheng et al.