کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9461444 1312904 2005 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phylogeny and biogeography of Valerianaceae (Dipsacales) with special reference to the South American valerians
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
Phylogeny and biogeography of Valerianaceae (Dipsacales) with special reference to the South American valerians
چکیده انگلیسی
Species of Valerianaceae are a common component of the alpine flora throughout the Northern Hemisphere as well as the Andes of South America. Sequence data from three chloroplast markers (psbA-trnH intron, trnK-matK intron, and the trnL-F region) along with the internal transcribed spacer region (ITS) of nuclear ribosomal DNA were used to infer relationships within Valerianaceae. Both genomes, as well as a combined data set, provide support for the major clades within the group and do not support a monophyletic Valeriana. In addition, these data indicate that Plectritis is nested within South American Valeriana, as opposed to being sister to Centhranthus as previously hypothesized. Valerianaceae appear to have originated in Asia, probably in the Himalayas, and subsequently to have dispersed several times to Europe and to the New World. Our results imply that Valerianaceae colonized South America on multiple occasions from the north. In one of these cases there appears to have been a substantial and rapid radiation, primarily in the high elevation paramo habitat. A variety of methods were used to estimate divergence times to determine when Valerianaceae might have colonized South America. Regardless of the method and fossil constraints applied, our estimates suggest that Valerianaceae colonized South America prior to the formation of the Isthmus of Panama.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Organisms Diversity & Evolution - Volume 5, Issue 2, 10 June 2005, Pages 147-159
نویسندگان
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