Phylogenetic relationships in Maloideae (Rosaceae): evidence from sequences of the internal transcribed spacers of nuclear ribosomal DNA and its congruence with morphology |
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Authors: | Christopher S. Campbell Michael J. Donoghue Bruce G. Baldwin Martin F. Wojciechowski |
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Affiliation: | Department of Plant Biology and Pathology, 5722 Deering Hall, University of Maine, Orono, Maine, 04469-5722 Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, 02138 Jepson Herbarium and Department of Integrative Biology, University of California, 1001 Valley Life Sciences #2645, Berkeley, California, 94720-2645 Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona, 85721 |
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Abstract: | We used sequences from both internal transcribed spacers (ITS) and a small portion of the 5.8S gene of nuclear ribosomal DNA (nrDNA) for phylogenetic reconstruction of 19 genera of Maloideae and four potential outgroups from the Rosaceae. Parsimony analyses indicate that Maloideae are not monophyletic; Vauquelinia, which is traditionally placed in Spiraeoideae, and two genera of the Maloideae, Eriobotrya and Rhaphiolepis, form a well-supported clade that is the sister to the remainder of the subfamily. Although our ITS phylogenetic hypothesis is highly resolved, there is considerable homoplasy, and support, as indicated by bootstrap values and decay indices, is relatively weak for all groups except four: Eriobotrya-Rhaphiolepis-Vauquelinia, Crataegus-Mespilus, Amelanchier-Peraphyllum-Malacomeles, and Cydonia-Pseudocydonia. Our DNA sequence data do not support a broad interpretation of Sorbus. Intergeneric hybridization, which is prevalent in Maloideae, occurs between genera that are far removed from one another on our most-parsimonious trees. We infer an overall phylogeny from separate analyses of ITS DNA sequences and recently published morphological and wood anatomical studies of Maloideae and from analyses after pooling these data sets. The four most strongly supported clades of the ITS phylogeny appear in the phylogeny based on pooled data. |
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