ibclogo XVI International Botanical Congess

Abstract Number: 4138
Poster No. = 424


AN INTEGRATED ANALYSIS OF DNA SEQUENCES, MORPHOLOGY ANDPALEOBOTANY FOR THE PHYLOGENETIC RELATIONSHIPS OF THE BETULACEAE


Z. D. Chen*, S. R. Manchester# and H. Y. Sun*, *Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China and #Department of Natural Sciences, University of Florida, Gainesville, FL 32611, USA


A parsimonious analysis was conducted using ITS sequences of 17 species representing six genera in the Betulaceae. The internal transcribed spacers ITS-1 and ITS-2 of nuclear ribosomal DNA provided 114 phylogenetically informative sites from 490 aligned sites. The analysis produced one fully resolved most parsimonious tree with 383 steps and C1-0.775. Outgroup rooting suggests two major lineages with almost equal bootstrapping support are concordant with the two traditional tribes-Betuleae and Coryleae in the Betulaceae, one comprising Alnus and Betula, the other including Corylus, Ostryopsis, Carpinus and Ostrya. This conclusion is consistent with those yielded from rbcL sequence and morphological analyses, and greatly reinforced by combined analysis. The generic relationships inferred by phylogenetic analyses are greatly congruent with those indicated by ecological evolution and extensive fossil records.

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