Toups, Megan , Preuss, Daphne , Swanson, Robert .
Mapping loci involved in nonrandom mating in Arabidopsis thaliana.
Because of their lack of mobility, flowering plants are sometimes thought to be passive and undiscriminating mates, accepting with equal anonymity whatever sperm should come their way. Empirical studies demonstrate this not to be the case. In many flowering plants in diverse taxa, when pollen of mixed genetic lineages compete for fertilization, the progeny from the competition differ in proportion from the initial pollen deposition. This phenomenon is called nonrandom mating. This phenomenon is of potentially great evolutionary importance. The winners of the competition are able to pass their genes on to the next generation.
We have developed a system to investigate nonrandom mating in the well-characterized and genetically tractable flowering plant Arabidopsis thaliana. We show that Arabidopsis mates nonrandomly in competitions between genetically distinct accessions, such as the Columbia accession and the mutagenized Landsberg erecta accession. We are currently working to demonstrate this phenomenon in geographically isolated accessions collected from Central-Asia (Shahdara) and Europe (Bay-0). Using Columbia and Landsberg recombinant inbred lines, we demonstrate that nonrandom mating shows transgressive segregation. We have also constructed a preliminary genetic map identifying five loci on two chromosomes that are involved in nonrandom mating.
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1 - The University of Chicago, Molecular Genetics and Cell Biology
2 - Valparaiso University, Biology Department, Neils Science Center, Valparaiso, Indiana, 46383, USA
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM