ibclogo XVI International Botanical Congess

Abstract Number: 2640
Poster No. = 854


PHYLOGENY OF GEEAE (ROSACEAE), AS EVIDENCED BY DNASEQUENCES OF INTERNAL TRANSCRIBED SPACERS (ITS) OF NUCLEAR RIBOSOMAL DNA AND THE CHLOROPLAST TRNL/F REGION


Jenny Smedmark and Torsten Eriksson Bergius Foundation, Royal Swedish Academy of Sciences, Box 50017, S-104 05 Stockholm, Sweden and Department of Botany, Stockholm University, S-106 91 Stockholm, Sweden


Allopolyploid speciation has been suggested to have occurred in Geeae, a clade within the Rosoids consisting of Fallugia, Sieversia, Waldsteinia, Coluria and Geum sensu lato. To investigate this we compared phylogenies based on maternally inherited chloroplast DNA (the trnL-trnF intron and spacer) and nuclear ribosomal DNA (ITS). The two data sets were fairly congruent, both supporting some unexpected groupings. Geum appears to be paraphyletic, including both Waldsteinia and Coluria, as well as certain other segregates. This preliminary evaluation of allopolyploidy is not conclusive, but gives some support to the hypothesis.

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