Figure 2.

Structure and Phylogeny of SSTM1 Genes.

(A) Alignment of inferred SSTM1 protein sequences from S. dunnii (SdSTM1), S. rexii (SrSTM1), and S. saxorum (SsSTM1) to Arabidopsis STM, showing shared conserved domains and intron positions (arrowheads). Black boxes highlight invariant amino acids, dark gray boxes amino acids conserved between Streptocarpus proteins, and light gray boxes conservative substitutions. Sequences were aligned using ClustalW.

(B) Strict consensus of the four most parsimonious KNOX trees using homeobox cDNA sequences. Dicot STM-like genes are highlighted in black and Streptocarpus genes with arrowheads. Aaknox1, mkn1, and Crknox3 were included as outgroups and trees rooted on the algal sequence, Aaknox1. Bootstrap values are given above branches.