Fig. 6: Evolutionary model for allopolyploidization and the following specific subgenomic evolution drive the origin of traits in the Populus-Salix lineage compared with other related genera of Salicaceae with one or two species.
From: Ancient allopolyploidy and specific subgenomic evolution drove the radiation of poplars and willows
The model shows three subfamilies of the Salicaceae, with an ancestral lineage (Ancestor A) in subfamily Salicoideae hybridized with another extinct ancestral lineage (Ancestor B). The resulting hybrid underwent rediploidization and gradually diverging into four lineages with subgenomic dominance. Duplicated genes underwent dynamic changes in retention and divergence of subgenome expression patterns, setting the stage for trait innovation in these lineages. Among these, the Populus-Salix lineage developed innovative traits related to seeds and flowering, which facilitated its radiation.
