Mitton J B, Kreiser B R, Latta R G
Department of Environmental, Population and Organismic Biology, University of Colorado, Boulder, CO 80309, USA.
Mol Ecol. 2000 Jan;9(1):91-7. doi: 10.1046/j.1365-294x.2000.00840.x.
To make inferences about the glacial refugia that harboured the limber pine, Pinus flexilis James, we examined the range-wide population structure of mitochondrial DNA (mtDNA) with eight size variants in the second intron of nad1. The data consisted of haplotypes from 704 trees collected from 40 localities. The value of FST for these populations was 0.80, which is a much larger value than has been reported for allozymes and chloroplast DNA (cpDNA) in limber pine, and it suggests that the number of seeds moving among localities per generation is approximately 0.12. Gene flow of this magnitude would allow mutation and subsequent genetic drift to have a substantial impact on the population structure of mtDNA. The majority of the mtDNA haplotypes are restricted to minor portions of the geographical range. The data are consistent with mtDNA differentiation in seven glacial refugia, followed by dispersal out of those refugia.
为了推断曾庇护柔枝松（Pinus flexilis James）的冰期避难所，我们检测了线粒体DNA（mtDNA）的全范围种群结构，该结构在nad1基因第二内含子中有八个大小变异体。数据由来自40个地点的704棵树的单倍型组成。这些种群的FST值为0.80，这一数值远大于之前报道的柔枝松等位酶和叶绿体DNA（cpDNA）的FST值，这表明每代在不同地点间移动的种子数量约为0.12。这种程度的基因流会使突变及随后的遗传漂变对mtDNA的种群结构产生重大影响。大多数mtDNA单倍型都局限于地理分布范围的较小区域。这些数据与mtDNA在七个冰期避难所发生分化，随后从这些避难所扩散出来的情况一致。
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