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Journal of Heredity Advance Access published online on April 13, 2006
Journal of Heredity, doi:10.1093/jhered/esj030
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© The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.
Received April 27, 2005
Revised October 24, 2005

Article

Source Populations of Quercus glauca in the Last Glacial Age in Taiwan Revealed by Nuclear Microsatellite Markers

Yuan-Jr Lee 1, Shih-Ying Hwang 2, Kuo-Chieh Ho 3, and Tsan-Piao Lin 1 *

1 From the Institute of Plant Biology, National Taiwan University, 1 Roosevelt Road, Section 4, Taipei 106, Taiwan
2 From the Graduate Institute of Biotechnology, Chinese Culture University, Yangmingshan, Taipei 116, Taiwan
3 From the Department of Life Sciences, National Taiwan University, 1a Roosevelt Road, Section 4, Taipei 106, Taiwan

* To whom correspondence should be addressed.
Tsan-Piao Lin, E-mail: tpl{at}ntu.edu.tw


  Abstract

In this work, we attempted to study genetic differentiation between populations of Quercus glauca in Taiwan using nuclear microsatellite markers to infer the potential refugium in the last glaciation stage. Four microsatellite loci for 20 individuals each in 10 populations of Taiwan were analyzed. We found that Q. glauca has relatively high within-population diversity (HE = 0.741) and low population differentiation (FST = 0.042) but shows isolation by distance. The most divergent populations, according to the average FST for individual populations in comparison with every other population, were found in populations Cy, Sa, and Hy in southern Taiwan and Pa in north-central Taiwan. Moreover, populations Cy, Sa, and Pa were recognized as being the source populations for gene recolonization after the last glaciation stage. In addition, the three sites of Wu, Ym, and Cy exhibited the highest gene diversities that coincided with populations with the highest chloroplast DNA variations. This may have resulted from an admixture of colonization routes. In conclusion, observations of the most divergent populations and source populations suggest that southern and probably north-central Taiwan may have potentially been refugia for Q. glauca in the last glaciation. This agrees with the possible refugium in southern Taiwan revealed by a previous study using chloroplast DNA markers.


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