Figure 6

Phylogenetic relationship between PPR proteins of the 4.3 and 23 Megabase region of Arabidopsis chromosome 1 and PPR genes found elsewhere in the Arabidopsis genome. The seven PPR proteins at the right hand side of this unrooted tree are all members of the P subfamily of PPR proteins and belong to the 4.3 or 23 megabase clusters of PPR genes. The other ten PPR proteins are a representative random sampling of PPR proteins of all 5 subfamilies and subgroups (P, E, E+, PLS, DYW, as defined by Lurin et al., 2004) from chromosome 1 and another chromosome of Arabidopsis chosen at random. PPR proteins of the 4.3 and 23 megabase regions are more closely related to each other than they are to other P-subfamily genes or other PPR genes from other sub-groups, and form a distinct branch away from these PPR proteins.