Plastid genomes and deep relationships among the commelinid monocot angiosperms

摘要: The commelinid monocots comprise the orders Arecales (A), Commelinales (C), Poales sensu Angiosperm Phylogeny Group III (APGIII) (P), Zingiberales (Z), plus unplaced family Dasypogonaceae (D), collectively containing numerous economically and ecologically important species encompassing enormous morphological diversity. Commelinids are supported as monophyletic based on anatomy molecular data; however, relationships among major groupings conflict previous studies, representing a long-standing problem in monocot systematics, with implications for interpretations of character evolution. In more recent analyses, whole-plastome sampling largely focused Poales, areas remain, suggesting need closer investigation support. Here, we increased plastomes non-Poalean to investigate deep nodal Analysis 83 plastid genes recovered ((A, D) (ZC, P)) robust support, regardless reconstruction method (parsimony/likelihood). However, was evident when grouped by genomic region. Cumulative analyses ranked decreasing numbers informative characters indicated continued fluctuation even small were added nearly complete matrix, contrary expected pattern stabilization Topology tests groups suggested that data not powerful enough reject all alternatives. This study provides clues limits genome resolving monocots.