Phylogenetic relationships ofPolemoniaceae inferred from 18S ribosomal DNA sequences |
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Authors: | Leigh A Johnson Douglas E Soltis Pamela S Soltis |
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Institution: | (1) Department of Botany, Washington State University, 99164-4238 Pullman, Washington, USA;(2) Department of Botany, North Carolina State University, Box 7612, 27695-7612 Raleigh, North Carolina, USA |
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Abstract: | Cladistic analyses of chloroplast DNA disagree with current classifications by placingPolemoniaceae near sympetalous families with two staminal whorls, includingFouquieriaceae andDiapensiaceae, rather than near sympetalous families with a single staminal whorl, such asHydrophyllaceae andConvolvulaceae. To explore further the affinities ofPolemoniaceae, we sequenced 18S ribosomal DNA for eight genera ofPolemoniaceae and 31 families representing a broadly definedAsteridae. The distribution of variation in these sequences suggest some sites are hypervariable and multiple hits at these sites have obscured much of the hierarchical structure present in the data. Nevertheless, parsimony, least-squares minimum evolution, and maximum likelihood methods all support a monophyleticPolemoniaceae that is placed nearFouquieriaceae, Diapensiaceae and related ericalean families. |
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Keywords: | Asteridae Polemoniaceae 18S rDNA sequences systematics phylogenetics |
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