Figure 1.

Rice and Arabidopsis SnRK2 Protein Kinase.

(A) A phylogenetic tree constructed with the amino acid sequences of the kinase domains (amino acid residues 1 to 268 of SAPK1 and corresponding residues of other sequences) of all SnRK2 family members of rice and Arabidopsis and some selected members from other species. The rice and Arabidopsis members are highlighted with black and white backgrounds, respectively. Nomenclature of the Arabidopsis members followed that of the PlantsP database (http://plantsp.sdsc.edu/; Hrabak et al., 2003). OST1/SRK2E are synonymous to SnRK2.6. Alignment of the full-length sequences is in the supplemental data online. The bootstrap values are in percent.

(B) Alignment of the amino acid sequences of the C-terminal domains. Identical amino acid residues are boxed, and similar residues are shaded in gray. Dashes indicate gaps in the sequences to allow maximal alignment.