Figure 1.

Alignment of the PDF sequences between poplar and Arabidopsis. One complete amino acid sequence alignment of the two poplar PDFs with their orthologs in Arabidopsis was performed. It was found that they respectively shared the best amino acid sequence identities with AtPDF1A (AT1G15390) and AtPDF1B (AtPDF1B). Motifs 1, 2 and 3 are indicated as blue frames. White characters in grey boxes indicate strict identity, and black characters in white boxes indicate similarity. α, η and β represent α-helix, short 3₁₀ helix and β-sheets, respectively. (a) Sequence alignment of PtrPDF1A (XP_002298107.1) with AtPDF1A of Arabidopsis; (b) Sequence alignment of PtrPDF1B (XP_002300047.1) with AtPDF1B of Arabidopsis. Gaps were introduced to insure maximum identity.