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頁籤選單縮合
題 名 | High Levels of Genetic Variation in Korean Populations of Sasamorpha Borealis (Poaceae)=韓國Sasamorpha borealis (Poaceae)族群的高度遺傳變異 |
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作 者 | Lee,Nam Won; Chung,Myong Gi; | 書刊名 | Botanical Bulletin of Academia Sinica |
卷 期 | 40:4 1999.10[民88.10] |
頁 次 | 頁311-317 |
分類號 | 377.2124 |
關鍵詞 | 異源酵素; 營養系歧異性; 遺傳歧異性; 果實內結成種子; 篩選; Allozymes; Clonal diversity; Genetic diversity; Mast seeding; Sasamorpha borealis; Selection; |
語 文 | 英文(English) |
中文摘要 | 利用異源酵素 (allozyme) 作為遺傳標誌來研究探討韓國 Sasamorpha borealis(Hack.) 族群之遺傳及基因型歧異性 (genotypic diversity), 在韓國丘S. borealis 通常生長於山腹位於松樹一橡樹下層。很多種竹子都有產生種子的時期, 當經過廣泛的地下莖生長散佈一段時期後, 同一區域內幾乎所有的成株都會產生風授粉過的花,並結大量的種子,然後死亡。本研究主要探討種的遺傳歧異性與生殖生物學間的關係。 S. borealis 族群維持相當高的遺傳歧異性:約 51% 檢試的基因座是多型性的且其平均遺傳歧異性為 Hep=0.219, 每一族群之多基因座基因型的平均數目為 18.4, 平均基因型歧異性指數(D[])為 0.720。然而族群問 (G[]=0.310) 約有31% 的遺傳變異,不同族群間(P<0.OO1) 所有檢試的基因座其對偶基因頻率有極顯著的差異,其所有比對後的平均遺傳同一性 (average genetic identity) 約為 0.833(SD =0.046), 間接估算每代間移動者的數目約為 0.56( 從 G〔〕上計算) 及 0.20( 從每十個對偶基因的平均頻率上計算 ) 。 S. borealis 之幾個生物學及生態學上的性狀 ( 廣泛的地質上分佈、長期存留的棲息地、具高度基因型歧異性的營養系繁殖、風授粉的育種系統、成株死亡時產生大量的種子、可能的低的族群間遺傳流動(genetic flow) 、某些取樣族群中異源基因型的篩選、再移殖的型式、遺傳漂變 (genetic drift) 的效應、及局部的篩選力量 ) 或許對於種之族群遺傳結構之形成扮演重要角色。 |
英文摘要 | Genetic and genotypic diversity of Korean populations in Sasamorpha borealis (Hack.) Nakai were investigated using allozymes as genetic markers. In Korea, S. borealis usually grows on hillsides under pine-oak understory. Many species of bamboos have the intermast period of "mast seeding." After spreading by extensive rhizomes for a specific period, nearly all adults in one area produce wind-pollinated flowers, set large quantities of seeds, and die. This study was undertaken to infer relationships between levels of genetic diversity and the reproductive biology of the species. Populations of S. borealis maintain high levels of genetic diversity: 51% of the loci examined were polymorphic and of mean genetic diversity (H, = 0.219). The mean number of multilocus genotypes per population was 18.4, and the mean genotypic diversity index (D0) was 0.720. However, 31% of the total genetic variation was found among populations (GST = 0.310). Allele frequencies for all loci examined differed significantly among populations (p < 0.001). Average genetic identity for all pairs of populations was 0.833 (SD = 0.046). Indirect estimates of the number of migrants per generation (Nm) were 0.56 (calculated from GST) and 0.20 (calculated from the mean frequency of ten private alleles). Several biological and ecological traits found in S. borealis (widespread geographical distribution, long-lived habit, clonal reproduction with relatively high genotypic diversity, wind-pollinated breeding system, death of adults bearing large quantities of seeds, probable low gene flow among populations, selection for heterozyous genotypes in some of the sampled populations, the patterns of recolonization, effects of genetic drift, and local selective forces) may have played roles in shaping the population genetic structure of the species. |
本系統中英文摘要資訊取自各篇刊載內容。