Fig. 3. Genome evolution of Cucumis hystrix.

a Genome collinearity analysis of cucumber, Cucumis hystrix, and melon. Chromosome number is showed at the right end of each chromosome diagram. b Phylogenetic relationships of the 12 selected species and gene family evolution. The numbers of total genes, gene families, clustered genes, and unclustered genes are summarized in the right table. Black numbers at each node represent the estimated time of each divergent event. Green and red numbers along each branch indicate the number of expanded and contracted gene families, respectively. MRCA, most recent common ancestor. c Venn diagram of shared gene families among cucumber, C. hystrix, melon, and watermelon. d Ks distribution of synthetic orthologs of the selected species. Csa, C. sativus, C. hystrix, Cme, C. melo; Cla, Citrullus lanatus; Lsi, Lagenaria siceraria; Cma, Cucurbita maxima; Vit, Vitis vinifera