Systematics Section / ASPT
Sherwood, Anna , Riaz, Ahmad , Jasieniuk, Marie .
Taxonomic Uncertainty in glyphosate-resistant Lolium (Poaceae) of California.
LOLIUM is a small genus with eight described species. Three of these species are obligate outcrossers, while five are selfing. Many of the Lolium species, due to introduction, currently have a world wide distribution. However, determining which species has been introduced to a region can be difficult. The three outcrossing Lolium species, L multiflorum, L. perenne, and L. rigidum, have similar morphology and freely hybridize. On four continents, including North America, populations of outcrossing Lolium have evolved resistance to glyphosate. Glyphosate resistance hampers efforts to control this invasive species. In California, these populations have been referred to as L. rigidium. However, no molecular data support this classification. To confirm the identity of the glyphosate resistant populations, we screened Simple Sequence Repeat (SSR) loci for markers specific to L. multiflorum, L. perenne, and L. rigidum. No SSR markers that distinguished the three outcrossing species were detected. Using nrDNA and clpDNA sequence data, we reconstructed the phylogeny of the genus Lolium. For each outcrossing species, samples of multiple individuals from at least four continents were included. We both tested if, the three outcrossing species are biologically separate entities and which geographic area(s) was the source of the glyphosate resistance populations of Lolium within California.
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1 - University of California Davis, Plant Sciences, One Shields Ave, Plant Sciences Mail Stop 4, Davis, California, 95616, USA
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM