Fig. 1

Phylogenetic tree of the VQ genes in Sweetpotato, I. trifida, I. triloba, I. nil, and Arabidopsis. The VQ gene names of I. batatas, I. trifida, I. triloba, I. nil, and Arabidopsis were colored with purple, green, cyan-blue, orange, and red, respectively. Red, orange, green, blue, cyan-blue, purple, yellow, and olive lines represent the phylogenetic group I, II, III, IV, V, VI, VII, and VIII, respectively. P25941 was used as outgroup (marked as blue)