ibclogo XVI International Botanical Congess


Abstract Number: 4070
Poster No. = 638


PHYLOGENETIC RELATIONSHIPS AND PHYLOGEOGRAPHY OF THE GENTIANOPSIS CRINITA COMPLEX (GENTIANACEAE) BASED ON nrDNA ITS SEQUENCES


Marie. Bouillé, Jean Bousquet CRBF, Univ. Laval (Québec), Canada


North American Gentianopsis include transcontinental complex of morphologically similar taxa: G. crinita (Froel.) Ma, G. procera (Holm) Ma, G. macounii (Holm) Iltis and G. victorinii (Fern.) Iltis. The phylogenetic relationships among these taxa and their position within the subtribe Gentianinae were estimated using ITS1&2 sequences of nrDNA. G. crinita was found to be highly similar (divergence value of 0.2%) to the three other taxa, which had 100% sequence identity. In comparison, sequence divergence between G. crinita and the parapatric G. nesophila was 2.7%, and 6.7% on average within Gentianopsis. Thus, the G. crinita complex should be regarded as a single species comprising only ssp. crinita and procera. Gentianopsis formed a monophyletic sister group to other genera of the subtribe Gentianinae. North American Gentianopsis were phylogenetically closer to East Asian taxa than to European and Western Asian taxa, suggesting a possible migration between Eastern Asia and North America.


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