KIM, SANGTAE1,2*, DOUGLAS, E. SOLTIS3, PAMELA, S. SOLTIS4, YOUNGBAE SUH2, and MICHAEL ZANIS5. 1School of Biological Sciences, Seoul National University, Seoul 151-742, Korea; 2Natural Products Research Institute, Seoul National University, Seoul 110-460, Korea; 3Department of Botany and the Genetics Institute, University of Florida, Gainesville, FL 32611, USA; 4Florida Museum of Natural History and the Genetics Institute, University of Florida, Gainesville, FL 32611, USA; 5School of Biological Sciences, Washington State University, Pullman, WA 99164,USA. - Phylogeny of early-diverging eudicots based on multiple genes: rbcL, atpB, 18S and 26S rDNA sequences.
Parsimony analyses were conducted using a four-gene data set
(rbcL, atpB, 18S rDNA, and 26S rDNA; over 8000 bp/taxon)
for genera of early-diverging eudicots and appropriate placeholders
for core eudicots using basal angiosperms as outgroups (60 genera
total). The strict consensus of two shortest trees reveals a
well-supported Ranunculales as sister to the remainder of eudicots,
followed by Proteales, Sabiaceae + Buxaceae + Didymeliaceae +
Trochodendraceae, and core eudicots. However, the clade of Sabiaceae +
Buxaceae + Didymeliaceae + Trochodendraceae receives support < 50%.
Within Ranunculales, most relationships receive support > 50%.
Euptelea is sister to the remainder of the clade. Papaveraceae are the
subsequent sister to the remaining Ranunculales. Lardizabalaceae and
Circaeasteraceae form a clade that is sister to Menispermaceae and a
clade of Ranunculaceae + Berberidaceae. Although our analyses provide
additional support for relationships within Ranunculales,
relationships among the groups of early-diverging eudicots are still
unclear. Resolving these relationships will be a difficult task,
requiring the sequences of still additional genes.
Key words: 18S rDNA, 26S rDNA, atpB, early-diverging eudicots, phylogeny, rbcL