Genes that are duplicated as concomitant events of species formation and continue to have the same function are called orthologous genes. New gene functions can be caused by duplications that occur within the genome of a single species. Duplications within a genome result in paralogous gene.

  Orthogroups, orthologs and paralogs genes were identified using OrthoFinder (v2.5.1). First, the similarity relationship between protein sequences of all species was based on the Blastp similarity score (E-value 51e-5). The sequence alignment program was blast_gz and the conformational tree method was FastTree. MCL graph clustering algorithm (Inflation value >1.5) was used for cluster analysis to obtain single-copy and multi-copy gene families.