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| 1 | 东亚及南亚固有绵羊群体的遗传结构研究显示文摘【目的】分析东亚及南亚固有绵羊群体的遗传结构。【方法】以多座位电泳法检测中国4个绵羊群体结构基因座上的变异,同时引用11个绵羊群体的同类资料作为参考。【结果】15个群体结构基因座平均杂合度和有效等位基因数分别为0.2746和1.559;平均杂合度和有效等位基因数都是蒙古国绵羊群体最大,蒙古国、中国、越南、孟加拉国和尼泊尔绵羊群体的遗传多样性依次减小。绵羊群体间遗传分化系数在0.0126~0.3083之间,平均为0.148,说明遗传变异主要存在于群体内,占总变异的85.2%。群体地理位置的远近与遗传距离间无相关性;大多数群体间基因流通畅,使得群体间地理位置的远近与遗传距离不完全一致。东亚及南亚15个固有绵羊群体大致可分为两大类群:一类包括了中国和蒙古国的部分群体,另一类则包括了中国云南绵羊、尼泊尔以及孟加拉国的部分群体,其余群体逐步汇入这两大类群。【结论】东亚及南亚15个固有绵羊群体间的遗传分化程度相对不高;地理隔离不是影响群体间遗传分化的主要原因;亲缘关系聚类分析可将15个绵羊群体大致分为两大类群。 | 耿荣庆 常洪 王兰萍 杨章平 孙伟 冀德君 角田健司 | 2007 | 中国农业科学2007，40，8： | 4 |
| 2 | 中国蒙系绵羊品种间的基因流动显示文摘利用结构基因座和微卫星标记分析了中国蒙系绵羊4个品种间的基因流动情况。结果显示,由结构基因座得出的遗传分化系数在0.0164~0.0455之间,由微卫星位点得出的遗传分化系数在0.0107~0.0239之间,说明遗传变异绝大部分存在于品种内,蒙系绵羊品种间的遗传分化水平很低。结构基因座(Nm=7.971)和微卫星位点(Nm=15.732)都反映出品种间的基因流通畅。品种间的遗传差异与地理距离之间无直接相关关系。初步推断我国蒙系绵羊品种间的遗传分化主要是自然选择(生境异质性)作用的结果。 | 耿荣庆 常洪 王兰萍 杨章平 孙伟 冀德君 鲁生霞 杜垒 | 2007 | 遗传2007，29，3： | 3 |
| 3 | Genetic Structure of Native Sheep Populations in East and South Asia显示文摘Variations of structural loci among 4 sheep populations in China were examined by the method of multiloci electrophoresis, and similar data from 11 sheep populations were taken as basic references to analyze the genetic structure of the native sheep populations in East and South Asia. The results showed that the average heterozygosity and effective number of alleles among 15 populations were 0.2746 and 1.559, respectively. Mongolian sheep possessed the largest average heterozygosity and effective number of alleles. Genetic diversity of sheep populations in Mongolia, China, Vietnam, Bangladesh and Nepal was reduced in this order. The coefficients of genetic differentiation were between 0.0126 and 0.3083, with the average of 0.148, demonstrating that genetic variations lay mainly in populations with 85.2% of the total variations. There exists no correlation between geographical distances and genetic distances. Gene flow was smooth among most populations, which led to inconsistency between geographical distances and genetic distances. The 15 native sheep populations in East and South Asia could be divided into two groups: One group included part populations of China and Mongolia, and the other included Yunnan populations of China, and part populations of Nepal and Bangladesh. Other populations did not cluster together and divide into the above-mentioned two groups. This study indicated genetic differentiation of the 15 native sheep populations in East and South Asia was relatively low, geographical isolation was not the main reason affecting genetic differentiation, and the fifteen sheep populations could be divided into two groups according to phylogenetic relationships. | GENG Rong-qing CHANG Hong WANG Lan-ping YANG Zhang-ping SUN Wei JI De-jun Tsunodak K | 2007 | Agricultural Sciences in China2007，6，9： | 0 |
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