Angiosperm phylogeny inferred from 18S rDNA, rbcL, and atpB sequences

Authors: SOLTIS D.E.1; SOLTIS P.S.1; CHASE M.W.2; MORT M.E.1; ALBACH D.C.1; ZANIS M.1; SAVOLAINEN V.2; HAHN W.H.3; HOOT S.B.4; FAY M.F.2; AXTELL M.5; SWENSEN S.M.5; PRINCE L.M.6; KRESS W.J.O.H.N.6; NIXON K.C.7; FARRIS J.S.8

Source: Botanical Journal of the Linnean Society, Volume 133, Number 4, August 2000 , pp. 381-461(81)

Publisher: Academic Press

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Abstract:

A phylogenetic analysis of a combined data set for 560 angiosperms and seven outgroups based on three genes, 18S rDNA (1855 bp), rbcL (1428 bp), and atpB (1450 bp) representing a total of 4733 bp is presented. Parsimony analysis was expedited by use of a new computer program, the RATCHET. Parsimony jackknifing was performed to assess the support of clades. The combination of three data sets for numerous species has resulted in the most highly resolved and strongly supported topology yet obtained for angiosperms. In contrast to previous analyses based on single genes, much of the spine of the tree and most of the larger clades receive jackknife support ge50%. Some of the noneudicots form a grade followed by a strongly supported eudicot clade. The early-branching angiosperms are Amborellaceae, Nymphaeaceae, and a clade of Austrobaileyaceae, Illiciaceae, and SchiÍsandraceae. The remaining noneudicots, except Ceratophyllaceae, form a weakly supported core eumagnoliid clade comprising six well-supported subclades: Chloranthaceae, monocots, Winteraceae/Canellaceae, Piperales, Laurales, and Magnoliales. Ceratophyllaceae are sister to the eudicots. Within the well-supported eudicot clade, the early-diverging eudicots (e.g. Proteales, Ranunculales, Trochodendraceae, Sabiaceae) form a grade, followed by the core eudicots, the monophyly of which is also strongly supported. The core eudicots comprise six well-supported subclades: (1) Berberidopsidaceae/Aextoxicaceae; (2) Myrothamnaceae/Gunneraceae; (3) Saxifragales, which are the sister to Vitaceae (including Leea) plus a strongly supported eurosid clade; (4) Santalales; (5) Caryophyllales, to which Dilleniaceae are sister; and (6) an asterid clade. The relationships among these six subclades of core eudicots do not receive strong support. This large data set has also helped place a number of enigmatic angiosperm families, including Podostemaceae, Aphloiaceae, and Ixerbaceae. This analysis further illustrates the tractability of large data sets and supports a recent, phylogenetically based, ordinal-level reclassification of the angiosperms based largely, but not exclusively, on molecular (DNA sequence) data.Copyright 2000 The Linnean Society of London

Keywords: classification –; molecular systematics –; large data sets.

Language: English

Document Type: Research article

Affiliations: 1: Department of Biological Sciences, Washington State University, Pullman, Washington, 99164, U.S.A. 2: Molecular Systematics Section, Royal Botanic Gardens, Kew, Richmond, TW9 3DS, United Kingdom 3: CERC, Columbia University, 1200 Amsterdam Ave, New York, NY, 10027, U.S.A. 4: Department of Biological Sciences, University of Wisconsin, Milwaukee, Wisconsin, 53201, U.S.A. 5: Department of Biology, Ithaca College, Ithaca, NY, 14850, U.S.A. 6: Department of Botany, Smithsonian Institution, Washington D.C, 20560, U.S.A. 7: Bailey Hortorium, Cornell University, Ithaca, NY, 14853, U.S.A. 8: Molekylärsystematiska Laboratoriet, Naturhistoriska Riksmuseet, Stockholm, S-104 05, Sweden

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