Figure 4. Phylogenetic and domain analyses of MAPKKs.

(a) Phylogenetic relationships of B. distachyon, Arabidopsis and rice MAPKK genes. The phylogenetic tree was constructed by NJ (Neighbor–joining) method using the MEGA 4 program. Different color patternings indicate different gene clusters or superclusters. (b) Schematic diagram of amino acid motifs of B. distachyon MAPKKs. The black solid line represents the corresponding BdMAPKK and its length. The different-colored boxes represent different motifs and their position in each BdMAPKK sequence.