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以品种主成分欧氏距离为基础,对江浙沪地区的100个大麦品种进行了系统聚类和动态聚类。根据参与聚类的性状为单个、2个……直至所有考察的10个性状,分别将这些品种分成若干个组。结果表明:1.各种单个、2个或3个性状组合聚类时,每组品种都有其明确的特征,从而有利于大麦育种的选择利用。随着参与聚类性状的增多,有些性状的组间差异变得不明显,结果趋于按自然类型(二棱或多棱,裸或皮)分组。另一方面,参与聚类的性状愈多,分组就愈为稳定。平均符合率(即不同年份分在同一组的品种数占总品种数的比率)在
Based on the Euclidean distance of the main components of cultivars, 100 barley cultivars in Jiangsu, Zhejiang and Shanghai were systematically clustered and clustered dynamically. According to the traits involved in clustering as a single, two ... until all the investigated 10 traits, these varieties were divided into several groups. The results showed as follows: 1. When all kinds of single, 2 or 3 trait combinations were clustered, each group of cultivars had their definite characteristics, which was conducive to the selection and utilization of barley breeding. As the number of clustering traits increased, the differences between groups of some traits became insignificant and the results tended to be grouped by natural type (two-sided or multi-sided, bare or skinned). On the other hand, the more traits involved in clustering, the more stable the grouping. The average coincidence rate (ie, the percentage of breeds in the same group in different years in the total breed)