Fig. 1

The phylogenetic relationship and sequence divergence of DA1-like proteins from G. soja (GsoDA1) and G. max (GmaDA1). a The ML (maximum likelihood) and NJ (neighbor-joining) trees were constructed using protein sequences. The green lines represent GmaDA1 proteins, and the orange lines represent GsoDA1 proteins. The position of amino acid substitution sites (vertical black lines) and of indels (vertical blue lines) is shown (details in Additional file 1: Table S2). b Schematic representation of the evolutionary process of DA1-like genes during the speciation of soybeans