Genetic diversity and population structure of the endangered and medically important Rheum tanguticum (Polygonaceae) revealed by SSR Markers
Genetic diversity and population structure of the endangered and medically important Rheum tanguticum (Polygonaceae) revealed by SSR Markers
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DOI：
10.1016/j.bse.2009.08.004
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发表时间：
2009-11-01
影响因子：
1.6
通讯作者：
Liu, Jianquan
中科院分区：
文献类型：
--
作者：
Chen, Fangjian;Wang, Ailan;Liu, Jianquan
唐古特大黄（Rheumtanguticum）是我国特有的濒危植物。共采集到114株R.利用7对SSR标记对唐古特10个地理分离居群的野生唐古特种质资源进行了分析。共检测到102个等位基因，平均每个位点14.6个等位基因（13 ~ 17个），期望杂合度（H-e）为0.384 ~ 0.515，平均为0.459。居群间的遗传分化程度较高（F-St=0.249），但基因流（N-m= 0.754）有限，约21.18%的遗传变异发生在居群间。我们的研究结果揭示了种群内和种群间的高水平遗传变异。该物种的濒危状态可能是由于野生种群的收获，而不是缺乏遗传多样性。人类学的影响以及其他因素可能共同塑造了这个物种的遗传结构。(C)2009爱思唯尔有限公司保留所有权利。
Rheum tanguticum (Polygonaceae), an endangered plant, is endemic to the Qinghai-Tibetan Plateau. A total of 114 individual of R. tanguticum from 10 geographically separate populations were analyzed using seven pairs simple sequence repeats (SSR) markers. 102 alleles were recorded, with an average of 14.6 alleles per locus (ranging from 13 to 17) and the expected heterozygosity (H-e) ranged from 0.384 to 0.515 (average 0.459). The genetic differentiation between populations was relatively high (F-St=0.249): the gene flow (N-m=0,754), however, was limited, which suggested that around 21.18% of the total genetic variations occurred between populations. Our results revealed high levels of genetic variations within and between populations. The endangered status of this species is probably due to harvesting of the wild populations, rather than a lack of the genetic diversity. Anthropologic effects as well as other factors may, together, have shaped the genetic structure of this species. (C) 2009 Elsevier Ltd. All rights reserved.