Linkage-map based study of natural selection acting on the hybrid zonesbetween Pinus pumila and P. parviflora

利用连锁图谱上的34个标记位点，对鹤田山、枣山和谷川山3个杂交带的遗传结构进行了分析，探讨了自然选择对杂交带的影响。在所有杂交区均检测到4个标记位点等位基因频率的显著差异。这4个基因座可能受到自然选择的影响。此外，杂交群体的连锁不平衡程度最低，表明两个亲本物种的遗传融合在枣山高度发达。

Genetic structures of three hybrid zones (Mt. Hakkoda, Mt. Zao and Mt. Tanigawa) were analyzed by using 34 marker loci mapped on a linkage-map in order to detect natural selection acting on the hybrid zones. Statistically significant deviations of allele frequencies were detected at4 marker loci consistently across all hybrid zones. It is suggested that natural selection would act on the 4 loci. Additionally, we found that the hybrid population in Mt. Zao showed the least level of linkage disequilibrium, suggesting that genetic fusion between the two parental species is highly developed in Mt. Zao.