Zhao Zuo-Cheng, Zhou Ming-De, Wang Zhong-Ren, Hou Xin
Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
Yi Chuan Xue Bao. 2002;29(8):723-34.
Genetic diversity and differentiation among 50 populations of total 8 species and 1 variety of Fagopyrum tataricum and its related species from 27 counties of Sichuan and Yunnan provinces, Southwest China were investigated using allozyme electrophoresis. Seven enzymesat 12 loci were assessed. The result shows that among 8 species and 1 variety, inbreeding coefficient is -0.54(-)-0.80, which means hterozogote excess. Higher genetic diversity was found in the wild related species of F. tataricum than in F. tataricum. F. dibotrys has the highest Fst value, which means that more genetic variations exist among its populations. The lowest Fst value shows that less genetic variations exist among population of F. gracilipes whic is close to panmictic There is almost no genetic differentiation between populations of F. statice. Genetic similarity is 55.3%-65.2% between species of F. tataricum and its related species, which is close to the average level among species in seed plants. According to the cluster analysis of genetic similarity, F. gracillipes is most close to F. tataricum and F. esculentum. Jinsha River region is the distributional and original center of F. tataricum and its related species.
利用等位酶电泳技术，对来自中国西南地区四川和云南27个县的8个种1个变种的50个苦荞麦及其近缘种居群的遗传多样性与分化进行了研究。共检测了7种酶的12个位点。结果表明，在8个种1个变种中，近交系数为-0.54（-）-0.80，表现为杂合子过剩。苦荞麦野生近缘种的遗传多样性高于苦荞麦。金荞麦的Fst值最高，表明其居群间存在较多的遗传变异。纤细野荞麦的Fst值最低，表明其居群间遗传变异较少，接近随机交配群体。抱茎苦荬菜居群间几乎没有遗传分化。苦荞麦及其近缘种间的遗传相似性为55.3%-65.2%，接近种子植物种间的平均水平。根据遗传相似性的聚类分析，纤细野荞麦与苦荞麦和甜荞最为接近。金沙江流域是苦荞麦及其近缘种的分布和起源中心。
