Fig. 2

The phylogenetic tree of HD-Zip proteins from wheat, Arabidopsis, maize and rice. Members of the HD-zip genes from wheat are marked in red. Two-letter prefixes for sequence identifiers indicate species of origin. Ta, Triticum aestivum; At, Arabidopsis thaliana; Os, Oryza sativa; Zm, Zea mays. The tree was constructed using the Neighbor-Joining algorithm with 1000 bootstrap based on the full length sequences of HD-Zip proteins. The HD-Zip proteins are grouped into four distinct groups