Fig. 5

A phylogenetic tree of SUS genes ofG. max. A ML tree was constructed with MEGA 7.0 software using amino acid sequences based on the WAG model, the numbers on the branches represent the bootstrap supports. SUS genes are fromG. max. We calculate theKsvalue of homologous gene pairs in each subfamily (Additional file7: Table S2), and then interpret the replication nodes based on theKsvalue. The common ancestor nodes marked by red triangles, represent the duplication event during the recent soybean lineage-specific WGD [25]. The common ancestor nodes marked by blue triangles, represent the duplication event during the ancient legume WGD [25]. The common ancestor nodes marked by orange diamonds, represent the triplication event during the core eudicots WGT [32,33]