基于叶部特征的地被菊分类研究

Classification of ground cover Chrysanthemum based on leaf's features

地被菊(Chrysanthemum morifolium Ramat.)花色丰富,适应性强,品种繁多,应用潜力巨大,但鲜见关于其品种分类研究.以32份地被菊为材料,以14个叶形参数为指标,采用聚类分析方法对其进行分类.结果表明:基于Q型聚类分析将32份地被菊分为2大类和10小类;进一步对地被菊叶形参数进行R型聚类分析和主成分分析,结果表明在聚类分析中,包括尖削度、上裂片张开度、下裂片张开度和叶身长宽比4个叶形参数贡献率达74. 49%,可以作为叶分类的重要指标.另外,叶片扫描电镜结果进一步表明叶形参数可作为地被菊品种分类标准.

Though the ground cover Chrysanthemum was rich in color and adaptability,and had great potential for application,it was rare to study the classification of its cultivars.Thirty two types of cultivars of ground cover Chrysanthemum were selected to classify with14parameters of leaf s shape via cluster analysis.The results showed that the32types ground cover Chrysanthemums were divided into2major groups and10small groups based on the Q cluster analysis.R cluster and principal component analysis were used to make further analysis and the results showed that the four parameters contribution rate were74.49%,including the apex angle,the terminal opening,the lower lobes opening,and the leaf aspect ratio.These parameters could be used as important indexes for leaf classification.The results of shape of leaves SEM scanning showed that the classification methods via the shape of leaf could be used as a classification standard for different varieties of ground cover Chrysanthemum.