Slotta, Tracey , Horvath, David , Foley, Micheal .
Detecting Diversity in Canada Thistle with Microsatellites.
Canada thistle (Cirsium arvense (L.) Scop.) is one of the top 20 invasive plants in North America, causing economic loss due to habitat destruction, competition with native and agricultural plants, and alleopathic effects. Seven microsatellite loci were used to examine genetic diversity of Canada thistle throughout North America. Sampled populations included habitats from wetlands to prairie in natural areas and agricultural fields with 2 to 96 individuals collected. Partitioning of samples for analysis of molecular variance resolved four groups corresponding to geography and habitat similarities. Multiple introduction events to North America have contributed to the high diversity present. Several genotypes are shared throughout North America, suggesting long distance dispersal through human mediated actions. Variance within populations is greater than regional levels as local dispersal via pollen flow and seeds contribute to novel genotypes in established stands. Clonal reproduction through rhizomes plays a minor role in maintenance of stands. Control measures in Canada thistle should prevent pollen flow and seed dispersal to curtail the spread of this highly invasive plant.
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1 - University of Maryland Biotechnology Institute, 9600 Gudelsky Drive, Rockville, MD, 20850, USA
2 - USDA-ARS-RRVARC- Biosciences Research Lab, Plant Science, 1605 Albrecht Blvd., Fargo, ND, 58105, USA
3 - USDA-ARS Biosciences Research Laboratory, Plant Sceince
Presentation Type: Oral Paper:Papers for Topics
Location: Williford A/Hilton
Date: Tuesday, July 10th, 2007
Time: 9:30 AM