Phylogenetics of <i>Buckleya</i> (Santalaceae) based on ITS sequences of nuclear ribosomal DNA

TitlePhylogenetics of Buckleya (Santalaceae) based on ITS sequences of nuclear ribosomal DNA
Publication TypeJournal Article
Year of Publication2001
AuthorsLi J, Boufford DE, Donoghue MJ
Pagination137 - 150
Keywordsbiogeography, Buckleya, ITS, molecular clock, phylogeny, PLANT SCIENCES, Santalaceae

Buckleya (Santalaceae) is a hemi-parasitic, shrubby genus with two species in China, one in Japan, and one in the southeastern United States. Phylogenetic relationships among these species are controversial and have not been tested using molecular data. In this study we used sequences of the internal transcribed spacer region of nuclear ribosomal DNA to test previous phylogenetic hypotheses. Two sister species pairs are well supported: B. distichophylla plus B. graebneriana, and B. lanceolata plus B. henryi. Sequence differences and morphological characters support the recognition of B. lanceolata and B. henryi. Sequence divergence between B. distichophylla and B. graebneriana is twice as high as that between B. lanceolata and B. henryi. These results are most consistent with the treatment proposed by Carvell and Eshbaugh. Biogeographically, one of the Chinese species (B. graebneriana) is most closely related to the eastern North American species (B. distichophylla), while the other C

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