Land Plant Evolution: Phylogenetics and Beyond
dePamphilis, Claude W. , Wall, P. Kerr , Duarte, Jill Ricker , Zahn, Laura , Cui, Liying , Müller, Kai , Leebens-Mack, Jim , Carlson, John , Frohlich, Mike , Ma, Hong .
The evolutionary diversification of land plant transcription factors: Crawling through new genomes.
THE major innovations during land plant evolution included the development of roots, leaves, and vasculature, and reproductive systems suited to life in a limited water environment. The origin of flowers is among the most striking of these major innovations, and floral development is one of the best-understood complex processes in plants. Here, we investigate the history of more than 100 genes from Arabidopsis with known function in flower development through an exploratory analysis of the Selaginella, Physcomitrella, and Chlamydomonas genomes, other sequenced plant genomes, and existing subgenomic data from gymnosperms and basal angiosperms. In order to make these comparisons, we have devised a new tool – GenomeCrawler – that identifies homologs of genes of interest from tracefile or preliminary genomic data, assembles the sequences, and extracts regions for phylogenetic and other comparative analyses. From these studies, three patterns of gene family evolution have emerged: 1) long term gene or gene family stability (by far, the least common), 2) highly dynamic histories that are the product of frequent gene (or genome) duplications followed by subsequent gene loss, 3) independent expansion of gene lineages in specific organismal groups. Examples will be shown for each of these scenarios and we will consider what general conclusions can be drawn about the origin and evolutionary history of floral regulators.
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1 - Pennsylvania State University, Department of Biology, Institute of Molecular Evolutionary Genetics, and The Huck Institutes of the Life Sciences, University Park, Pennsylvania, 16802, USA
2 - Pennsylvania State University, School of Forest Resources, and the Huck Institutes of the Life Sciences, University Park, Pennsylvania, 16802, USA
3 - Natural History Museum, Department of Botany, Cromwell Road, London, SW7 5BD, England
Presentation Type: Symposium or Colloquium Presentation
Date: Monday, July 31st, 2006
Time: 2:15 PM