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Presented By: Ecology and Evolutionary Biology

EEB Thursday Seminar: Plant phylogenomics: comparative analyses of plant genes and genomes

Jim Leebens-Mack, University of Georgia

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Abstract
Phylogenetic frameworks for species relationships and gene families are becoming increasingly essential for organization and analysis of the avalanche of sequence data that has come with development of massively parallel sequencing technologies. Sequence clustering approaches such as OrthoMCL are providing approximations of gene families. Phylogenetic analyses of these gene family clusters are yielding improved understanding of species relationships and new insights into gene and genome evolution. I will illustrate the utility of low copy gene families for estimating species relationships and how resulting species tree inferences serve as a framework for inferring the evolution of multi-copy gene families and whole genomes. For example, a phylogenomic framework has been used to resolve the timing of known and previously unknown paleopolyploidy events in angiosperm history. Moreover, understanding the timing of paleopolyploidy events allows us to test hypothesized links between polyploidy, diversification and the origin of novel traits.

Light refreshments served at 4 p.m.
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