Fig. 1

Characteristics of AP2/ERF genes in Solanaceae. A The number of AP2/ERF genes from six subfamilies in 10 plant genomes. The domain repertoires of six subfamilies are represented by symbols positioned on the left side of the bar graph. The color of each bar indicates the subfamily. B The proportion of genes from subfamilies in the 10 species. The color of each bar indicates the subfamily. C Representation of the amino acid sequence and secondary structures in the AP2 domain from 10 species. The x- and y-axes in the diagram of the amino acid logo indicate the position of amino acids in the AP2 domain and the relative frequency of amino acids at each position, respectively. The location of the secondary structure is depicted on the upper side of the amino acid logo. The alignment of amino acid sequences positioned below the logo shows the most conserved amino acids in each position. For the sequence in uppercase, more than half of the genes contain specific amino acids in that position; if this is not the case, the sequence is lowercase. The specific amino acid residues that are critical in distinguishing the subfamily are highlighted in yellow. The bar graph below the alignment shows the consensus ratio of eight divisions considering the secondary structure of the AP2 domain. The colors of the bar display different divisions: pink bar indicates division in α-helix, blue bars indicate divisions in β-sheets, and grey bars indicate the interval regions. D Heat map of the number of the top five gene ontology (GO) terms of AP2/ERF genes. Three GO categories are listed over the heat map. The number of GO terms is indicated by the color of the boxes next to the heatmap