Fig. 3.

Phylogenetic relationships between NBS-encoding genes in the B. rapa and A. thaliana genomes. The neighbor-joining tree was constructed using the NBS domains of 90 B. rapa and 140 Arabidopsis NBS-encoding proteins reported by Meyers et al. (2003) using MEGA4 software. CNL and TNL groups of each species are represented by color bars. Bootstrap values are indicated on the branches and the branch length reflects the estimated number of substitution per 100 sites; bootstrap results were not reported if the support was <50%. Brackets and braces in the tree indicate the subgroup names of Arabidopsis as reported by Meyers et al. (2003) and the B. rapa groups identified in Fig. 2, respectively. On the right margin, clades I–III represent the TNL group; clade IV represents a mixed TN group; and clades V–VII represent the CNL group. An example of local expansion in BrTNL-1 is indicated with an asterisk