Phylogenetic relationships in Maloideae (Rosaceae): Evidence from sequences of internal transcribed spacers of nuclear ribosomal DNA and its congruence with morphology

TitlePhylogenetic relationships in Maloideae (Rosaceae): Evidence from sequences of internal transcribed spacers of nuclear ribosomal DNA and its congruence with morphology
Publication TypeJournal Article
Year of Publication1995
AuthorsCampbell CS, Donoghue MJ, Baldwin BG, Wojciechowski MF
JournalAmerican Journal of Botany
Volume82
Pagination903 - 918
ISSN00029122
KeywordsPLANT SCIENCES
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, Enriobotrya 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-Vauguelinia, 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

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