Fig. 3

Phylogenetic relationships, gene structure and architecture of conserved protein motifs in WRKY genes from pineapple. a The phylogenetic tree was constructed based on the full-length sequences of pineapple WRKY proteins using MEGA 5 software. Details of clusters are shown in different colors. b Exon-intron structure of pineapple WRKY genes. Blue boxes indicate untranslated 5′- and 3′-regions; yellow boxes indicate exons; black lines indicate introns. The WRKY domains are highlighted by red boxes. The number indicates the phases of corresponding introns. c The motif composition of pineapple WRKY proteins. The motifs, numbers 1–20, are displayed in different colored boxes. The sequence information for each motif is provided in Additional file 2. The length of protein can be estimated using the scale at the bottom