Molecular Biology and Evolution, Vol 14, 1023-1034, Copyright © 1997 by Society for Molecular Biology and Evolution
P Awadalla and K Ritland
Mutational variability at microsatellite loci is shaped by both population
history and the mating system. In turn, alternate mating systems in
flowering plants can resolve aspects of microsatellite loci evolution. Five
species of yellow monkeyflowers (Mimulus sect. Simiolis) differing for
historical rates of inbreeding were surveyed for variation at six
microsatellite loci. High levels of diversity at these loci were found in
both outcrossing and selfing taxa. In line with allozyme studies,
inbreeders showed more partitioning of diversity among populations, and
diversity in selfing taxa was lower than expected from reductions in
effective population size due to selfing alone, suggesting the presence of
either population bottlenecks or background selection in selfers.
Evaluation of the stepwise mutation model (a model of DNA replication
slippage) suggests that these loci evolve in a stepwise fashion. Inferred
coalescent times of microsatellite alleles indicate that past bottlenecks
of population size or colonization events were important in reducing
diversity in the inbreeding taxon.
ORIGINAL ARTICLE
Microsatellite variation and evolution in the Mimulus guttatus species complex with contrasting mating systems
Department of Botany, University of Toronto, Ontario, Canada. awadalla@botany.utoronto.ca
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