大麦品种数量性状的聚类分析研究

A CLUSTERING ANALYSIS OF QUANTITATIVE TRAITS IN BARLEY

定义品种标准化主成分间的欧氏平方距离为遗传距离，采用类平均法对６３个地理来源不同的品种进行系统聚类，将其分为８类。表明品种的地理分布对遗传差异有一定的影响，但两者间并无必然的联系。认为大麦杂交亲本应在类间距离大于平均类间距离的类间选配，同时参考主成分分析对品种综合性状的认识，并结合其它因素，选择综合性状好的品种作亲本。

The Euglidean square distances of standardized principal components between varieties have been defined in this paper as genetic distances.By using group average method the hierachical clustering was conducted for 63 barley varieties,which were divided into 8 clusters.It was showed that the geographical distribution of varieties is responsible to some extent for their genetic diversities,but no clear relation was found between them.It was supposed that corossing parents should be chosen between the clusters whose genetic distance was larger than the average distance of all clusters,and meanwhile,the knowledge of variety's comprehensive characters evaluated by principal component analysis should be considered.