Figure 2

Genome evolution of sesame. (a) Left: shared and unique gene families in each lineage. Right: distribution of the asterids-specific gene families in sesame, U. gibba, tomato and potato. Gene numbers in related gene families are listed in brackets. (b) The relationships between grapevine and two subgenomes of sesame. These regions are listed in Table S15 in Additional file 1. For each segment in the grapevine chromosome, two obvious duplicated collinear segments from sesame were aligned. According to the retained gene ratio in duplicated segments, the high (red) and low-fractionated segments (blue) are represented. (c) Polyploidization events in the asterids I lineage. Age was estimated according to Ks distribution. γ, gamma triplication event in eudicot ancestor; T, triplication event in the tomato-potato lineage; D, recent duplication event in sesame; Dmr, the most recent duplication event in U. gibba; Sin, Sesamum indicum; Sly, Solanum lycopersicum; Stu, Solanum tuberosum; Vvi, Vitis vinifera; Ugi, Utricularia gibba. See Supplementary Note 4 in Additional file 1 for more details.