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Originally published as Genetics Published Articles Ahead of Print on September 12, 2005.
Genetics, Vol. 172, 477-484, January 2006, Copyright © 2006
doi:10.1534/genetics.105.045682
Selection at Work in Self-Incompatible Arabidopsis lyrata: Mating Patterns in a Natural Population
Mikkel H. Schierup1, Jesper S. Bechsgaard, Lene H. Nielsen and Freddy B. Christiansen
Department of Ecology and Genetics, Institute of Biological Sciences, University of Aarhus, 8000 Aarhus C., Denmark
1 Corresponding author: Department of Ecology and Genetics, Institute of Biological Sciences, University of Aarhus, Ny Munkegade, Bldg. 540, 8000 Aarhus C., Denmark.
E-mail: mheide{at}birc.au.dk
Identification and characterization of the self-incompatibility genes in Brassicaceae species now allow typing of self-incompatibility haplotypes in natural populations. In this study we sampled and mapped all 88 individuals in a small population of Arabidopsis lyrata from Iceland. The self-incompatibility haplotypes at the SRK gene were typed for all the plants and some of their progeny and used to investigate the realized mating patterns in the population. The observed frequencies of haplotypes were found to change considerably from the parent generation to the offspring generation around their deterministic equilibria as determined from the known dominance relations among haplotypes. We provide direct evidence that the incompatibility system discriminates against matings among adjacent individuals. Multiple paternity is very common, causing mate availability among progeny of a single mother to be much larger than expected for single paternity.
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