Molecular phylogeny ofSalicaceae and closely relatedFlacourtiaceae: Evidence from 5.8 S, ITS 1 and ITS 2 of the rDNA |
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| Authors: | Elina Leskinen Cecilia Alström-Rapaport |
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| Institution: | (1) Department of Genetics, Uppsala University, Box 7003, S-750 07 Uppsala, Sweden;(2) Department of Plant Breeding, Swedish University of Agricultural Sciences, Box 7003, S-750 07 Uppsala, Sweden;(3) Present address: Department of Genetics, Uppsala University, Box 7003, S-750 07 Uppsala, Sweden |
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| Abstract: | A ribosomal DNA region, including the entire 5.8S RNA gene and the internal transcribed spacers ITS 1 and ITS 2, was used for studying the phylogeny ofSalicaceae and the relationship betweenSalicaceae andFlacourtiaceae. The length of the ITS regions withinSalicaceae andFlacourtiaceae was similar to that found in other angiosperms. The GC content of both ITS regions was high, varying 62.7-72.2%. The most parsimonious tree clusters the wind-pollinatedChosenia bracteosa among theSalix species, suggesting that it should be included in the genusSalix. The grouping withinSalix leaves subg.Salix as paraphyletic, for which reason the subgeneric division is questionable.Populus was monophyletic and formed a sister group toSalix. The interspecific variation of the ITS sequences was very small inSalicaceae, which is in contradiction to the age of the group according to the evidence from fossil data.Idesia polycarpa fromFlacourtiaceae shows great sequence similarity withSalicaceae, but the analysis of 5.8S rDNA supports monophyly of the four species ofFlacourtiaceae sampled for this study. |
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| Keywords: | Salicaceae Salix Populus Chosenia Flacourtiaceae Idesia Phylogeny ITS rDNA |
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