title: Generic relationships and dating of lineages in Winteraceae based on nuclear (ITS) and plastid (rpS16 and psbA-trnH) sequence data.
abstract: Phylogenetic analyses of representative species from the five genera of Winteraceae (Drimys, Pseudowintera, Takhtajania, Tasmannia, and Zygogynum s.l.) were performed using ITS nuclear sequences and a combined data-set of ITS+psbA-trnH+rpS16 sequences (sampling of 30 and 15 species, respectively). Indel informativity using simple gap coding or gaps as a fifth character was examined in both data-sets. Parsimony and Bayesian analyses support the monophyly of Drimys, Tasmannia, and Zygogynum s.l., but do not support the monophyly of Belliolum, Zygogynum s.s., and Bubbia. Within Drimys, the combined data-set recovers two subclades. Divergence time estimates suggest that the splitting between Drimys and its sister clade (Pseudowintera+Zygogynum s.l.) occurred around the end of the Cretaceous; in contrast, the divergence between the two subclades within Drimys is more recent (15.5-18.5MY) and coincides in time with the Andean uplift. Estimates suggest that the earliest divergences within Winteraceae could have predated the first events of Gondwana fragmentation.
authors: Universidad Nacional de Colombia, Apartado Aéreo 7495, Bogotá DC, Colombia. xmarquinezc@unal.edu.co
authors: Xavier
authors: X
authors: Marquínez
authors: Lúcia G
authors: LG
authors: Lohmann
authors: Maria L Faria
authors: ML
authors: Salatino
authors: Antonio
authors: A
authors: Salatino
authors: Favio
authors: F
authors: González
mesh_terms: D018744:DNA, Plant / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000235:genetics*; D019143:Evolution, Molecular; D005843:Geography; D010802:Phylogeny; D018087:Plastids / Q000235:genetics*; D017422:Sequence Analysis, DNA; D032423:Winteraceae / Q000145:classification / Q000235:genetics*
chemical_list: D018744:DNA, Plant; D021903:DNA, Ribosomal Spacer