Fig. 4

Maximum likelihood tree of protein sequences including PeAP1 and PeFUL. The tree presents PeAP1 and PeFUL featured in blue and purple, respectively, and other representative homologues of AP1, FUL and FUL-like of other species. SEP protein sequences are placed as outgroup. The accession numbers for the sequences are presented in the Additional file 2. The phylogenetic analysis was performed using the protein MADS-box, I-region, K-box and C-region. The euAP1, euFUL, FUL-like and SEP gene lineages are shown on the right side of the tree. Bootstrap values are shown at nodes