Figure 1. Phylogeny of G protein components in the plant kingdom.

(A) Conservation of G protein components in the plant kingdom. *, Genomes have not been sequenced; N/I, Not identified; +/−, 7TM-RGS gene is identified in a date palm, but not in the grass-family. (B–D) Phylogram of the consensus maximum likelihood (ML) tree as determined for Gα, Gβ and multi transmembrane RGS protein sequences. The trees were rooted with Homo sapiens Gα_i1, Gα_q, Gβ₁, Gβ₅ or S. moellendorffii 7TM-RGS genes. Bootstrap values above 40 are shown near each branch. White, gray or black circles indicate that the branch was supported more than 90%, 80% or 70%, respectively. Species and gene names are shown in blue, green, yellow or purple colors, indicating eudicots, monocots, gymnosperms or non-vascular plants, respectively. Scale bar represents 0.1 substitutions per sites. See Figure S1, S2, S3 for aligned sequences used for creating the trees.