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Evolutionary relationships in Ephedra (Gnetales), with implications for seed plant phylogeny
University of Zürich, Institute of Systematic Botany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Biology.
2009 (English)In: International journal of plant sciences, ISSN 1058-5893, Vol. 170, no 8, 1031-1043 p.Article in journal (Refereed) Published
Abstract [en]

Evolutionary relationships in Ephedra are difficult to resolve, mainly  because there are few informative characters in investigated loci and   long distances to outgroups. We address these problems by using a large   data set that includes information from seven plastid and nuclear loci   and 204 vascular plants. The deepest divergences in Ephedra are weakly   supported and differ by analytical method, but they indicate a basal   grade of species distributed in the Mediterranean area. New World   species are monophyletic, with a South American clade possibly nested   within a North American clade. A mainly Asian clade comprises several   well-supported subgroups, of which some are endemic to restricted   geographic regions in East or Central Asia; others have a broad   distribution that may extend into Europe (E. distachya, E. major)   and/or Africa (E. pachyclada-E. somalensis). Ephedra laristanica and E.   somalensis are nested within other species, whereas the recognition of   E. milleri as a separate species is supported. Our results provide   another example of how exceptionally difficult it is to disentangle the   early divergences of seed plants. Bayesian analysis strongly supports   the "gnetifer'' hypothesis, a result rarely found in the literature,   but it conflicts with our results from only chloroplast data   ("gne-cup'') and with results of most maximum parsimony analyses   ("Gnetales sister'').

Place, publisher, year, edition, pages
2009. Vol. 170, no 8, 1031-1043 p.
Keyword [en]
Ephedra, Gnetales, gnetifer hypothesis, seed plant phylogeny
National Category
Biological Sciences
Research subject
Systematic Botany
URN: urn:nbn:se:uu:diva-121796DOI: 10.1086/605116ISI: 000269771600007OAI: oai:DiVA.org:uu-121796DiVA: diva2:306581
Available from: 2010-03-30 Created: 2010-03-30 Last updated: 2011-12-01Bibliographically approved

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Publisher's full texthttp://www.journals.uchicago.edu/doi/abs/10.1086/605116

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