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Phylogenetic Relationships in Maloideae (Rosaceae): Evidence from Sequences of the Internal Transcribed Spacers of Nuclear Ribosomal DNA and Its Congruence with Morphology
Christopher S. Campbell, Michael J. Donoghue, Bruce G. Baldwin and Martin F. Wojciechowski
American Journal of Botany
Vol. 82, No. 7 (Jul., 1995), pp. 903-918
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2445977
Page Count: 16
You can always find the topics here!Topics: Genera, Datasets, Arias, Nucleotide sequences, Phylogeny, Plant morphology, Phylogenetics, Taxa, Wood structure, Biological taxonomies
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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.
American Journal of Botany © 1995 Botanical Society of America, Inc.