多変量解析によるボタン品種の形態的分類

Abstract

To obtain basic data necessary for various breeding targets of tree peony, principal component analysis and cluster analysis were applied using morphological characters of floral organs and foliage.1. In the results of principal component analysis, the first component (Z1) had a high correlation with items showing foliage size. The second component (Z2) had a high correlation with the number of leaves and the number of axillary buds. The third component (Z3) had a high correlation with items showing size of floral organs. The tested cultivars were separated on the plane showing component scores. ‘Kinkaku’ and ‘Kinshi’, which are hybrid cultivars between Paeonia lutea and Paeonia suffruticosa, were clearly marked off from the other cultivars (P. suffruticosa). The main morphological characters, which distinguished hybrid cultivars from the others, were flower stem length, flower neck length, leaf size and petal numbers.2. The tested cultivars were roughly divided into 6 groups by the cluster analysis. ‘Gunpohden’, which is hybrid cultivar between ‘Hanadaijin’ and ‘Kamatafuji’, belonged to the same group as the parents. ‘Yatsukajishi’, which is a seedling cultivar of ‘Hanakisoi’ belonged to another group. ‘Meijinohomare’ (Chinese cultivar) was separated clearly from the other Japanese cultivars. ‘Kinkaku’ and ‘Kinshi’ (hybrid cultivars) belonged to a completely different group.3. Thus, this analysis will facilitate to select breeding materials with various targets such as pot or cut flowers, otherwise it is difficult in the previous classification based on only flower morphology.