From Gels to Genomics: The Evolving Landscape of Pteridology. A Celebration of Gerald Gastony's Contributions to Fern Evolutionary Biology
Barker, Michael S. .
Pteridophyte Evolutionary Genomics: Unfurling the structure and history of fern and lycophyte nuclear genomes.
Ever since the first chromosome counts of homosporous pteridophytes revealed that they possess astonishingly high numbers of chromosomes, botanists have recognized the unique genomic composition of these plants. Numerous hypotheses have been proposed throughout the years to explain the origin and maintenance of these chromosome numbers but most were overturned through the isozyme work of Gastony, Haufler, and Soltis during the 1980s. The most favored hypothesis that emerged from this research was that these chromosomes are the result of numerous cycles of ancient polyploidy. Using genomic data (ESTs) for members of the Pteridaceae I demonstrate that fern genomes have indeed experienced ancient whole genome duplications, but that the high chromosome numbers appear to be the result of long term retention rather than multiple cycles of polyploidy, a significant difference from other eukaryotic genomes. I also present evolutionary analyses of the whole genome sequence of the lycophyte Selaginella moellendorffii, and an overview of insights into plant evolution provided by these data from this phylogenetically critical lineage. To summarize the current state of the field and its future directions, I provide an overview of our current pteridophyte genomic resources and a first look at next generation sequencing results from fern genomes.
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1 - Indiana University, Department of Biology, Jordan Hall, 1001 East Third Street, Bloomington, Indiana, 47405, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Room 5/Woodward
Date: Tuesday, July 29th, 2008
Time: 11:00 AM