Fig. 1

Neighbor-Joining phylogenetic tree of the SBP genes of five land plant species (a) and the corresponding gene structure analyses (b). Black boxes indicate the exon regions and lines indicate introns. The length of the boxes and lines are scaled based on the length of genes. The number above branch indicates the bootstrap values over 50 %. The genes marked by a single asterisk in the phylogenetic tree are regulated by miR156 and those marked by double asterisk are cooperatively regulated by both miR156 and miR529. The star indicates the major duplication events