Molecular Biology and Evolution 19:2030-2034 (2002)
© 2002 Society for Molecular Biology and Evolution
Parallel Patterns of Sequence Variation Within and Between Populations at Three Loci of Arabidopsis thaliana
*Departament de Genètica, Universitat de Barcelona, Spain;
Department of Biology, University of Oulu, Finland
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Evolutionary factors influencing naturally occurring diversity in the model species Arabidopsis thaliana are not fully understood. Nucleotide variation at several nuclear loci has been studied in samples consisting of worldwide accessions, usually one individual per population. Some loci seem to be highly dimorphic (e.g., Innan et al. 1996
; Aguadé 2001
), whereas for other loci there is no evidence of diverged haplotype groups (Kuittinen and Aguadé 2000
). On the contrary, variants at AFLP polymorphic sites do not occur commonly at intermediate frequencies (Miyashita, Kawabe, and Innan 1999
). It is not clear yet if the detected dimorphism could be due to past population structure, some form of balancing selection, other selective forces, or random drift in a selfing species. In inbreeders, background selection (Charlesworth, Morgan, and Charlesworth 1993
), adaptive sweeps (Hedrick 1980
) and local adaptation (Allard, Jain, and Workman 1968
), as well as drift and
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