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Angiosperm phylogeny based on <011>matK sequence information¹

²Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 USA; ³Botanisches Institut, Friedrich-Wilhelms-Universität Bonn, Meckenheimer Allee 170, 53115 Bonn, Germany; ⁴School of Biological Sciences, Washington State University, Pullman, Washington 99164 USA; ⁵Florida Museum of Natural History and the Genetics Institute, University of Florida, Gainesville, Florida 32611 USA; ⁶Molecular Systematics Section, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3DS, UK; ⁷Department of Biology, Western Kentucky University, Bowling Green, Kentucky 42101 USA; ⁸Biology Department, Acadia University, 24 University Avenue, Wolfville, Nova Scotia, Box 1X0, Canada; ⁹Muséum National d'Histoire Naturelle, 16, rue Buffon, 75005 Paris, France; ¹⁰Institut für Botanik, Zellescher Weg 22, 01062 Dresden, Germany; ¹¹Institut für Allgemeine Botanik, Universität Hamburg, Ohnhorststr. 18, 22609 Hamburg, Germany; ¹²Department of Biological Sciences, University of Maine, Orono, Maine 04469-5722 USA;and ¹³National Herbarium of the Netherlands, Utrecht University Branch, Heidelberglaan 2, 3584 CS Utrecht, Netherlands

Plastid matK gene sequences for 374 genera representing all angiosperm orders and 12 genera of gymnosperms were analyzed using parsimony (MP) and Bayesian inference (BI) approaches. Traditionally, slowly evolving genomic regions have been preferred for deep-level phylogenetic inference in angiosperms. The matK gene evolves approximately three times faster than the widely used plastid genes rbcL and atpB. The MP and BI trees are highly congruent. The robustness of the strict consensus tree supercedes all individual gene analyses and is comparable only to multigene-based phylogenies. Of the 385 nodes resolved, 79% are supported by high jackknife values, averaging 88%. Amborella is sister to the remaining angiosperms, followed by a grade of Nymphaeaceae and Austrobaileyales. Bayesian inference resolves Amborella + Nymphaeaceae as sister to the rest, but with weak (0.42) posterior probability. The MP analysis shows a trichotomy sister to the Austrobaileyales representing eumagnoliids, monocots + Chloranthales, and Ceratophyllum + eudicots. The matK gene produces the highest internal support yet for basal eudicots and, within core eudicots, resolves a crown group comprising Berberidopsidaceae/Aextoxicaceae, Santalales, and Caryophyllales + asterids. Moreover, matK sequences provide good resolution within many angiosperm orders. Combined analyses of matK and other rapidly evolving DNA regions with available multigene data sets have strong potential to enhance resolution and internal support in deep level angiosperm phylogenetics and provide additional insights into angiosperm evolution.

Key Words: angiosperms • Bayesian inference • matK • phylogeny • systematics

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