Fig. 2

Topological analysis in olive and two other Lamiales. a Possible scenarios of duplication and loss, and resulting topologies. Top left: In an autopolyploidization scenario in the common ancestor of Oleaceae and the other non-Oleaceae Lamiales, topology A is produced, and would be expected in gene-loss scenarios where paralogous gene copies are maintained in at least one species from both Oleaceae and the non-Oleaceae Lamiales. Top right: Gene loss may produce topology B if one paralogous lineage is lost in all non-Oleaceae Lamiales species, or alternatively, topology C if one paralogous lineage is lost in all Oleaceae species. Alternatively, an allopolyploidization scenario in which one of the parental lineages is not sampled will directly result in topology B or topology C, depending on the phylogenetic position of such parental. An allopolyploidization scenario resulting in a preponderance of topology B is depicted here. b Percentage of gene trees that support each of the topologies shown in Fig. 2a in the phylomes of O. europaea, F. excelsior, and S. indicum