Figure 1.

The phylogeny of Arabidopsis and rice PGs. The amino acid sequences for the glycosyl hydrolase 28 family motif were aligned. The phylogeny was generated using neighbor-joining algorithm with 1,000 bootstrap replicates. Sequences are color-coded according to the key. The plant PGs are classified into three major groups and multiple clades. The clades were defined by identifying nodes representing speciation events (circles, see Results section for criteria). For these nodes, red circles indicate that the bootstrap support for the subtending branches is higher than 50% and indicate the criteria for least number of common ancestral PGs between rice and Arabidopsis. The nodes are labeled with white circles if the bootstrap support is less than 50%. Arrowheads indicate clades that contain only sequences for one of the two plants.