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Abstract Detail

Systematics Section / ASPT

Jansen, Robert K. [1], Zhengqiu, Cai [1], Hansen, Debra [1], Dastidar, Sayantani [1], Peņaflor, Cynthia [2], Timme, Ruth [1], Hansen, Katie [1], Haberle, Rosemarie C. [3], Chumley, Timothy W. [1], Guisinger-Bellian, Mary M. [1], Daniell, Henry [4], Lee, Seung-Bum [4], Raubeson, Linda A. [5], Peery, Rhiannon [5], dePamphilis, Claude W. [6], Leebens-Mack, Jim [7], McNeal, Joel R. [8], Boore, Jeffrey [9], Kuehl, Jennifer V. [9].

Phylogeny of angiosperms based on whole chloroplast genome sequences.

WE have sequenced entire chloroplast genomes from representative angiosperms to assess relationships among the major lineages. To date we have sequenced 37 genomes representing many of the major angiosperm clades and representative gymnosperm outgroups. We have extracted and aligned nucleotide sequences for 80 genes from these new genomes and from 17 previously published angiosperm genomes, including all shared protein-coding genes and the four ribosomal RNAs. We developed a semi-automated procedure of gene alignment that, for protein-coding genes, includes an initial alignment of amino acid sequences. After manual adjustment, this amino acid alignment is then used to constrain the nucleotide alignment. The 80-gene data matrix includes over 60,000 bp of nucleotide sequence. Phylogenetic analyses using both maximum parsimony (MP) and maximum likelihood (ML) generate well-resolved trees with strong support for relationships among the major angiosperm clades. For most groups, trees generated by MP and ML analyses are congruent. Amborella and the Nymphaeales continue to group in the basal most position with MP and ML trees differing with regard to which is the most basal. The next most basal clade consists of the four magnoliid taxa, representing all four orders Laurales, Piperales, Canellales, and Magnoliales, which form a strongly supported monophyletic group. The eleven monocot taxa, representing four different orders, also form a strongly supported clade that is sister to the strongly supported, monophyletic eudicots. Within eudicots, Ranunculales form an early diverging lineage and both the rosids and asterids form strongly supported monophyletic groups, with the Caryophyllales a strongly supported sister group of asterids. Among rosids the Vitaceae comprises the earliest diverging clade and there is strong support for the monophyly of the eurosid II clade. In contrast, monophyly of the eurosid I clade is problematic and relationships among the sampled members of this group differ in ML and MP trees.

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1 - University of Texas Austin, Section of Integrative Biology, 1 University Station, A6700, Austin, Texas, 78712-7640, USA
2 - Brigham Young University, Department of Integrative Biology, 401 Widtsoe Building, Provo, Utah, 84602, USA
3 - University of Texas Austin, Section of Integrative Biology, 1 University Station, C0930, Austin, Texas, 78712, USA
4 - University of Central Florida, Molecular Biology & Microbiology, Biomolecular Science, Building #20, Room 336, Orlando, Florida, 32816-2364, USA
5 - Central Washington State University, Department of Biological Sciences, Ellensburg, Washington, 98926-7537, USA
6 - Pennsylvania State University, Department of Biology and Institute of Molecular Evolutionary Genetics, University Park, Pennsylvania, 16801, USA
7 - University of Georgia, Department of Plant Biology, Athens, Georgia, 30602, USA
8 - Harvard University, Arnold Arboretum, Harvard University Herbaria, 22 Divinity Avenue, Cambridge, Massachusetts, 02138, USA
9 - DOE Joint Genome Institute, Department of Evolutionary Genomics, 2800 Mitchell Drive, Walnut Creek, California, 94598, USA

angiosperm phylogeny
chloroplast genome.

Presentation Type: Oral Paper:Papers for Sections
Session: 31-8
Location: 144/Performing Arts Center
Date: Tuesday, August 1st, 2006
Time: 10:15 AM
Abstract ID:496

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