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陽明山地區台北菫菜族群遺傳結構之研究

Genetic Structure of Viola nagasawai in Yangmingshan, Taiwan

Abstracts


本研究使用同功鋂分析陽明山地區台北菫菜次族群內與次族群間遺傳結構,並探討其與生育系統及地理分布之關係。總共檢查四個次族群,81株個體,八種同功鋂,包含11基因座。族群遺傳變異度理論值為0.142,範圍介於0.007-0.186,實際觀測值為0.160,範圍介於0.097-0.252;多型性基因座比例為36.4,平均每一基因座有17基因(alleles)。F-statistics分析結果,族群內自交係數FIS=-0.276,顯示此種植物偏好異花授粉,族群間變異度FST=0.132,顯示種內具有中度的遺傳分化。次族群間基因流傳率大於一(Nm=1.64),且各次族群之遺傳距離與地理距離無關,顯示次族群間的遺傳分化並非來自基因流傳的阻礙,而可能係受生育環境影響所造成,故天擇作用為造成台北菫菜次族群遺傳分化之主要力量。

Parallel abstracts


Genetic structure within and among four subpopulations of Viola nagasawai was investigated using isozyme gel electrophoresis techniques. Eleven loci were surveyed from eight enzyme systems. The mean expected heterozygosity (HE) was 0.142 and ranged from 0.07 to 0.186. The mean observed heterozygosity (HO) was 0.160 and ranged from 0.097 to 0.252. The mean number of alleles per locus (A) was 1.7. The percentage of polymorphic loci (P) was 36.4. F-statistics revealed that the inbreeding coefficient within populations (FIS) was -0.276. This negative value suggested that the species prefered outcrossing. The level of genetic differentiation among populations (FST) was 0.132, which suggested a medium-grade of infraspecific genetic differentiation. Gene flow rate among subpopulations was greater than one (Nm=1.64), and indicated that genetic differentiation among subpopulations was not likely contributed by restricted gene flow However, natural selection probably played important role and caused genetic differentiation of V. nagasawai subpopulations in the Yang-ming-shan area.

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