Fig. 2

Gene family clustering and Ipomoea whole-genome triplication. a Venn diagram of orthologous gene families. OGs, orthologous groups. ‘Others’ include tomato, potato, grapevine, Arabidopsis thaliana, rice and Amborella trichopoda. b Distribution of Ks of orthologous or paralogous genes within and between genomes of I. trifida (Itf), I. triloba (Itb), I. nil (Inl), tomato (Sly) and potato (Stu). Estimated times of speciation and WGT events were calculated using a mutation rate of 7 × 10−9 substitutions per site per year. Mya, million years ago. c Multiplicated genomic regions in I. trifida, I. triloba, I. nil, and tomato