ibclogo XVI International Botanical Congess


Abstract Number: 3547
Session = 7.4.6


BASAL LINEAGES OF ANGIOSPERMS: EVIDENCE FROM MULTIPLE GENES.


P. S. Soltis,1 D. E. Soltis1, M. J. Zanis1, and S. Kim1,2. 1Washington State University, Pullman, USA, 2Seoul National University, Korea.


Relationships among basal angiosperm groups were investigated in the context of a larger phylogenetic analysis of the angiosperms. Analyses based on multiple genes reconstructed a grade of monosulcates at the base of the angiosperm tree. Amborellaceae, Nymphaeaceae, and a clade of Austrobaileyaceae, Illiciaceae, and Schisandraceae are successive sisters to all other angiosperms. The remaining monosulcates, except Ceratophyllum, which is the sister to the eudicots, form a weakly-supported clade that comprises six strongly-supported subclades: Chloranthaceae, Piperales, monocots, Laurales, Winteraceae/Canellaceae, and Magnoliales. Relationships among these six clades are not strongly supported. To compensate for homoplasy at these deep levels, we performed a compartmentalized analysis.


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