ITS Sequence Data Resolve Higher Level Relationships Among the Eucalypts

Sequences of the internal transcribed spacer (ITS) region of the nuclear ribosomal DNA were obtained for 35 species of Eucalyptus s.s. and seven taxa representing five outgroup genera (Allosyncarpia, Angophora, Arillastrum, Corymbia, and Stockwellia). The sequences were analyzed cladistically. The d...

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Bibliographic Details
Published in:Molecular phylogenetics and evolution 1999-07, Vol.12 (2), p.215-223
Main Authors: Steane, Dorothy A., McKinnon, Gay E., Vaillancourt, René E., Potts, Brad M.
Format: Article
Language:English
Subjects:
DNA, Ribosomal - genetics
Eucalyptus - classification
Eucalyptus - genetics
Evolution, Molecular
Genes, Plant - genetics
Genetic Variation - genetics
Molecular Sequence Data
Phylogeny
Plants, Medicinal
RNA, Ribosomal, 5.8S - genetics
Rosales - classification
Rosales - genetics
Sensitivity and Specificity
Sequence Alignment
Sequence Analysis, DNA
Sequence Deletion
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Summary:Sequences of the internal transcribed spacer (ITS) region of the nuclear ribosomal DNA were obtained for 35 species of Eucalyptus s.s. and seven taxa representing five outgroup genera (Allosyncarpia, Angophora, Arillastrum, Corymbia, and Stockwellia). The sequences were analyzed cladistically. The data distinguished clearly between the two major subgenera of Eucalyptus s.s. (Symphyomyrtus and Monocalyptus) but indicated that subgenus Eudesmia may be paraphyletic. ITS sequence data demonstrated the potential to resolve relationships between sections within subgenus Symphyomyrtus. Within sections, however, taxa were poorly differentiated. At the generic level, Corymbia appeared to be paraphyletic due to the exclusion of Angophora. The positions of Allosyncarpia and Arillastrum relative to the ingroup remain unresolved. ITS sequence data may prove valuable for resolving other phylogenetic relationships at higher taxonomic levels within Eucalyptus.
ISSN:1055-7903
1095-9513
DOI:10.1006/mpev.1999.0612