Phylogenetic reconstruction of the orthologous stress-associated bZIP transcription factors of Oryza sativa (Os), Sorghum bicolor (Sb) and Arabidopsis thaliana (At). The specific branches of the radial tree corresponding to the established functional sub-classes of bZIP transcription factors are indicated as Group-A, Group-D, Group-I, Group-H and Group-S . Each group is comprised of clusters of orthologous groups (tri-species COG). Genes from the same species that belong to two neighboring COGs are considered paralogous to each other. A phylogenetic tree that includes other paralogs is shown in Additional file 1.
Xu et al. BMC Genomics 2012 13:497 doi:10.1186/1471-2164-13-497