Polyploidy: genome obesity and its consequences.

Information about several papers discussed at the polyploidy workshop of the Plant and Animal Genome XV Conference, held in January 2007 in San Diego, California is presented. The event covered several topics such as ancient polyploidy events in Glycine, expression evolution of duplicate genes, gene expression changes, hybridization barriers in Arabidopsis and tissue-specific and stress-induced expression patterns of duplicate genes in cotton and hybrid Populus.