Fig. 3

Evolution of the WGD events and phylogenetic analysis of cjaND genome. a Distribution of Ks of syntenic gene-pairs in camellias (C. japonica), azalea (Rhododendron simsii), kaki (Diospyros kaki), kiwi fruit (Actinidia chinensis), and grape (Vitis vinifera). γ labels the ancient gamma WGD; Ad-β labels the common WGD for kiwi fruit and azalea; Ad-α labels the recent lineage-specific WGD in kiwi fruit; Da-α labels the lineage-specific WGD in kaki; Ca-α labels the Camellia specific WGD. b A time-calibrated phylogenetic tree of species based on the analysis of whole-genome orthologous genes. The red circle indicates the assessed species in Camellia genus. Color-filled dots indicate the postulated incidences of WGD events based on the Ks distribution patterns. C. japonica and C. oleifera have diverted about 7.53 million years ago