臺灣東北部的矢竹（Arundinaria usawai Hayata）亞族群間的遺傳變異度分析

Analysis of Genetic Variability among Subpopulations in Northern Taiwan of Arundinaria usawai Hayata

陳雅慈(Ya-Tzu Chen) ； 陳進霖(Chin-Lin Chen) ； 林怡孜(Yi-Tsu Lin) ； 王國雄(Kuo-Hsiung Wang) ； 黃生(Shong Huang)

《師大生物學報》 33卷1期 (1998/06) Pp. 57-69

https://doi.org/10.29812/BBNTNU.199806.0006

摘要

本文報導了分佈在陽明山和金瓜石兩地的臺灣矢竹（Arundinaria usawai Hayata）族群內和族群間的遺傳變異度與分化情形。使用同功酵素的方法，分析了十三種酵素、共判讀了24個基因座，其中半數以上屬多型性（P=0.505），各個基因座的平均對偶基因數為1.67個，遺傳變異度為0.221，族群分化指數（Fst）高達0.175。這些數值顯示臺灣矢竹的遺傳變異很豐富，卻在亞族群間存有高度的遺傳分化。若依據上述實驗教據及臺灣矢竹的生殖方式推論，則臺灣矢竹豐富的遺傳變異應來自於族群內無阻礙的基因流傳，而其族群內發生高度的遺傳分化，也符合一般靠分蘗擴張族群物種的遺傳結構。此外，小族群中的遺傳漂變也影響了族群的遺傳歧異度。

關鍵字

臺灣矢竹 ； 族群內遺傳變異度 ； 同功酵素 ； 基因流傳 ； 遺傳漂變

並列摘要

Arundinaria usawai, Taiwan arrow bamboo, is dominated in open area of Yang-Ming Shan National Park in northern Taiwan. Samples collected from 9 subpopulations were estimated for their genetic variability by isozyme analysis. Thirteen enzymes with 18 polymorphic loci were surveyed. The results indicated high genetic diversity among subpopulations of A. usawai. There was nearly half of polymorphic loci in surveyed enzymes (P = 50.5%), the numbers of allele per locus (A = 0.167) and the expected heterozygosity (HE = 0.221) were also high. The data implied that highly genetic variability within single population was caused not only by accmulation of variation in clonedeme, but also by the sexual reproduction and asexual propagation. Highly structured population in Yang-Mimg Shan may due to the Wahlund effect and rhizomatous propagation. The lose of locus PER and SKD-I in Chin-Kua Shih-II may refer to the genetic drift in this isolated subpopulation.

並列關鍵字

Arundinaria usawai ； genetic variability ； isozyme ； geneflow ； genetic drift