Figure 1.

Phylogenetic relationship of two-component signaling elements from rice and Arabidopsis. Alignments were based on His kinase domains (A), HPt domains (B), or receiver domains (C). Sequences from rice are in boldface and designated by the prefix Os; sequences from Arabidopsis are designated with the prefix At. Bootstrap supports for individual branches are given as percentages based on 1,000 bootstrap trials. For analysis of the HPt proteins, the yeast HPt protein YDL235C was included as an outgroup. Colored boxes indicate points of speciation and gene duplication. The nomenclature of rice elements is based on Schaller et al. (2007), and that of Arabidopsis elements on Schaller et al. (2008).