木瓜属(Chaenomeles)栽培品种与近缘种的数量分类

选取木瓜属(Chaenomeles)18个栽培品种和4个近缘种的24个形态学性状，利用SPSS10.0软件进行聚类分析，以探讨品种间的亲缘关系。Q型聚类分析显示供试样本可分为2类：木瓜和‘豆青’自成一类，与其他种类和品种关系疏远；其余种类和品种聚合成一类。而第2类分为4个亚类，贴梗海棠、木瓜海棠、倭海棠以及5个杂交品种分别聚合。根据聚类结果，‘猩红与金黄’和‘碧雪’等品种的分类地位值得进一步探讨。数量分类结果能够反映品种之间的亲缘关系。R型聚类结果表明，各分类性状之间没有明显的逻辑关系，24个形态学性状对品种的演化具有较独立的意义。主成分分析表明，前6个主成分的累计贡献率达85.9%，根据其与性状间的相关性可知，影响力较大的性状有花径、花梗颜色、花瓣形状、花瓣宽、瓣爪长、幼叶颜色、花托和果实形状、重瓣性和花瓣数目等。

Numerical taxonomy of cultivars and their related wild species in the genus Chaenomeles

Based on twenty-four morphological characteristics,eighteen cultivars and four related wild species of flowering quince(Chaenomeles) were investigated systematically and analyzed by cluster analysis with SPSS10.0 program in order to determine their relationships.The Q-cluster analysis showed that the twenty-two specimen were classified into two groups.The first group contained C.sinensis and 'Douqing',and the others were categorized into another group,reflecting the alienation between C.sinensis and the oth...