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SUPPLEMENTAL DATA
Supplemental Figure S1: Phylogenetic relationships and subgroup designations in MYB proteins in
Populus, Vitis, and Arabidopsis.
Supplemental Figure S2: PtrR2R3-MYB genes in the Clade 27 have a modified R3 DNA binding
domain. (a) Amino acid sequence logo corresponding to the modified region, showing the location of
4 additional residues found in Clade 27 members relative to the remainder of the PtrR2R3-MYB
family. (b) DNA sequence alignment showing that the nucleotides encoding the 4 additional amino
acids are located immediately upstream of the 5’ splice donor site of intron 2.
Supplemental Figure S3: Pairwise Pearson correlation coefficients of the expression profiles of 56
paralogous R2R3-MYB gene pairs as a function of the genetic distance separating the pair. No
evidence of a relationship between these factors was observed. Paralogous pairs were included
only if both genes had corresponding probe sets on the array.
Supplemental Table S1: R2R3- and 3R-MYB encoding genes from Populus trichocarpa. When a
MYB number appears to be absent, this has arisen from the fact that, when the Populus genome
was annotated, some gene models were mis-annotated as R2R3-MYB-encoding genes, when they
were, in fact, 1R-MYB-encoding sequences. As was the case with the Vitis 1R-MYB sequences, the
Populus 1R-MYB sequences were excluded from the construction of the R2R3-MYB and 3R-MYB
phylogeny.
Supplemental Table S2: Membership of subgroups in the P. trichocarpa, A. thaliana, and V.
vinifera phylogenetic tree.
Supplemental Table S3: R2R3- and 3R-MYB encoding genes from Arabidopsis thaliana.
Supplemental Table S4: R2R3- and 3R-MYB encoding genes from Vitis vinifera.
model identified by Matus et al. (2008).
1
Indicates gene
Supplemental Table S5: R2R3- and 3R-MYB encoding genes from a variety of tree species.
Supplemental Table S6: Landmark R2R3- and 3R-MYB encoding genes from a variety of plant
species.