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Journal of Heredity Advance Access published online on June 16, 2009
Journal of Heredity, doi:10.1093/jhered/esp036
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© The American Genetic Association. 2009. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Patterns of Nucleotide Diversity at the Methionine Synthase Locus in Fragmented and Continuous Populations of a Wind-Pollinated Tree, Quercus mongolica var. crispula

Nguyen D. Quang, Sosaku Ikeda, and Ko Harada

From the Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, Japan

Address correspondence to N. D. Quang at the address above, or e-mail: adaptation.global.warming{at}gmail.com.

Genetic variation is usually high within populations, and differentiation is usually low among populations of wind-pollinated outcrossing trees. As a result, population contraction causes little change in the degree of genetic diversity and differentiation among populations. The aim of this work was to determine whether or not a recent population decline has influenced the allele frequency spectrum and association among variants of different sites on the nuclear housekeeping locus methionine synthase (1376–1418 bp in length) in the oak species Quercus mongolica var. crispula. A total of 122 sequences from 18 populations were randomly sampled and analyzed in this study. Results showed that nucleotide variation was generally high within populations, and differentiation was very low among populations. Genetic diversity was slightly reduced in samples taken from the area with a recent strong reduction in population size. Nevertheless, the allele frequency spectrum was skewed toward rare variants, and the association among variants of different sites was significantly more nonrandom within these samples compared with those from the area without such a population size reduction. This pattern was robustly supported by coalescent simulations.

Key Words: fragmentation • Quercus mongolica var. crispula • recent bottleneck • sequence polymorphism

Corresponding Editor: Dr. James L Hamrick

Received October 18, 2008
Revised May 7, 2009
Accepted May 13, 2009


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