<i>Viburnum</i> phylogeny: evidence from the duplicated nuclear gene <i>GBSSI</i>

TitleViburnum phylogeny: evidence from the duplicated nuclear gene GBSSI
Publication TypeJournal Article
Year of Publication2004
AuthorsWinkworth RC, Donoghue MJ
JournalMolecular Phylogenetics and Evolution
Volume33
Pagination109 - 126
ISSN10557903
KeywordsBIOCHEMISTRY & MOLECULAR BIOLOGY, EVOLUTIONARY BIOLOGY, GBSSI, GENETICS & HEREDITY, phylogeny, Polyploidy, Viburnum, waxy
Abstract

DNA sequencing studies of the granule-bound starch synthase gene (GBSSI) indicate the presence of two loci in Viburnum. Gene trees from separate and combined phylogenetic analyses of the GBSSI paralogues are generally congruent with each other and with trees from previous analyses, especially those of Donoghue et al. [Syst. Bot. 29 (2004) 188] based on nuclear ribosomal ITS and chloroplast trnK intron DNA sequences. Specifically, our GBSSI trees confirm (i) the monophyly of some and non-monophyly of other traditionally recognized taxonomic sections, (ii) the presence of three major supra-sectional lineages within Viburnum, and (iii) the resolution of many species relationships within the section-level clades. Analyses of GBSSI also provide greater resolution of relationships within the largest supra-sectional lineage. Relationships at the base of the Viburnum phylogeny remain uncertain; in particular, the position of the root, relationships among the supra-sectional clades, and the ex

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