Figure 1.

Neighbor-joining tree for (A) chromosome 1 and (B) 20 kbp upstream and downstream (40 kbp in total) of domestication genes LABA1, PROG1, and sh4. Inner circles of colors represent domesticated rice: red, aus; blue, indica; yellow, temperate japonica; and brown, tropical japonica. Outer circles of colors represent wild rice as designated by Huang et al. (2012): green, Or-I; purple, Or-II; and orange, Or-III. Arrows indicate the most ancestral internal node of the monophyletic domesticated rice clade.