Bryological and Lichenological Section/ABLS
Chang, Ying , Graham, Sean W. .
Inference of higher-order relationships in Bryophyta from multiple plastid genes.
Recent studies have shed much light on relationships among the deepest branches of moss (Bryophyta) phylogeny, but there is still uncertainty concerning the relative arrangement of several major clades. We developed new sets of plastid-specific primers to survey multigene plastid genes for a broad sampling of taxa, together with multiple outgroup exemplars, in order to improve our knowledge of the broad backbone pf moss phylogeny. Our survey includes ~13 kb of plastid data (before alignment) per taxon, and mainly comprises slowly evolving genes that are involved in photosynthesis, chlororespiration and the plastid genetic apparatus. We generally recover well-supported backbone relationships using maximum-likelihood analysis. Among the first splits in moss phylogeny, we resolve Takakia (Takakiopsida) as sister group of all other mosses. The remaining successive sister-group splits are respectively represented by: (i) Sphagnopsida, (ii) a clade comprising Andreaea and Andreaeobryum (Andreaeopsida and Andreaeobryopsida), and (iii) Oedipodum (Oedipodiopsida). The relative positions of Polytrichopsida, Tetraphidopsida and Bryopsida remain less well supported. We also report on the potential for recovering artifactual phylogenetic relationships in deep moss phylogeny by examining subsets of nucleotides that correspond to different maximum likelihood rate classes.
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1 - University of British Columbia, UBC Botanical Garden and Certre for Plant Research, 6804 SW Marine Drive, Vancouver, BC, V6T 1Z4, Canada
2 - University of British Columbia, UBC Botanical Garden and Certre for Plant Research, 6804 SW Marine Drive, Vancouver, BC, V4T 1Z4, Canada
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Magpie B/Cliff Lodge - Level B
Date: Monday, July 27th, 2009
Time: 3:45 PM