Systematics Section / ASPT
Hoot, Sara B. , Taylor, W. Carl , Napier, Nancy S. .
The key players in IsoŽtes hybridization events in North America.
HYBRIDIZATION and allopolyploidy occur commonly in IsoŽtes, resulting in a proliferation of new species. Using sequence data from the second intron of a LFY homologue that is informative at the population and species levels, we have traced the hybrid origins of many American species. In doing this, we have discovered that some diploid species are especially promiscuous; their genomes occur in numerous hybrids and allopolyploids. For example, I. engelmannii contributed its genome to such diverse species of hybrid origin as I. boomii, I. tennesseensis, I. lacustris (from North America, Germany, and Great Britain), I. tuckermanii, I. acadiensis, I. azorica, and I. piedmontana. Sequences similar to the diploid, I. prototypus, have been detected in such diverse polyploids and hybrids as I. lacustris, I. occidentalis, I. X truncata, and I. X hickeyi. Some of the putative parental sequences cannot be traced to any known diploid species, either because they have not yet been discovered or they are extinct. For example, one unidentified parental sequence has been found in I. X truncata, I. tennesseensis,I. occidentalis, I. lacustris, and I. X hickeyi. We discuss possible reasons for why some species are implicated in hybrid origins more than others and the biogeographical implications of some hybridization events.
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1 - University of Wisconsin-Milwaukee, Department of Biological Sciences, P.O. Box 413, Milwaukee, Wisconsin, 53201, USA
2 - National Science Foundation, Division of Environmental Biology, 4201 Wilson Boulevard, Arlington, Virginia, 22230, USA
LFY intron 2
Presentation Type: Oral Paper:Papers for Sections
Location: 144/Performing Arts Center
Date: Monday, July 31st, 2006
Time: 3:30 PM