大蒜种质产量和品质性状主成分聚类分析与综合评价

以40个大蒜品种为供试材料,依据数值分类学的性状选择原则,分别于大蒜生长期和采收后进行农艺性状指标的采集。估算40个大蒜品种16个农艺性状及4个品质指标的主成分,并以前3个主成分和遗传相似性系数为基础,分别作二维散点图和系统聚类分析。40份大蒜品种前7个主成分累计贡献率达85%。根据品种性状主成分表现,评选出性状优良的大蒜品种共10个。在聚类图中,在0.14的遗传相似性水平上可以把40份品种分成4类,即由5份种质组成的类群Ⅰ;由28份种质聚成的类群Ⅱ;由改良蒜等4份种质组成的类群Ⅲ,及苏联蒜等3份种质组成的类群Ⅳ。全部种质的遗传相似性系数在0.07～0.64之间,很好地揭示了品种类群间存在的亲缘关系。

Cluster Analysis and Evaluation of Garlic(Allium sativum L.) Germplasm Based on Principal Components

The agronomy traits indexes of 40 garlic cultivars were Investigated based on the principal of numerical classification, and the PCA of 16 agronomy traits and 5 quality indexes were analyzed, the scatter plot were drawed based on the first 3 PC and the clustering were carried out based on the genetic coefficient. The first 7 PC accounted for 85% variation among the cultivars. The 10 excellent cultivars were selected based on the principal component. The 40 cultivars can be classified into 4 groups when SM coefficient was 0.12 on the UPGMA dendrogram. The clustering based on the 0.07~0.64 SM coefficient explained the genetic relationship of 40 cultivars.