Phylogenetic and domain analyses of MAPKKs.

<p>(a) Phylogenetic relationships of <i>B. distachyon</i>, <i>Arabidopsis</i> 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 <i>B. distachyon</i> 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.