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Numerical classification of 25 color-leafed Osmanthus fragrans clones (cultivars)
FENG Yuanyuan, LI Qingying, HUANG Junhua, HU Shaoqing
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (1) : 107-115.
PDF(3898 KB)
PDF(3898 KB)
Numerical classification of 25 color-leafed Osmanthus fragrans clones (cultivars)
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【Objective】 Numerical classification was carried out by observing the leaf and branch characteristics of Osmanthus fragrans cultivars. The results will provide a reference for their breeding and classification. 【Methods】 The morphological characteristics of 25 O. fragrans cultivars were observed in spring. Thirty-five leaf and branch characteristics were used for R-type clusters and a principal component analysis (PCA). After removing characteristics with a high correlation and low cumulative contribution, 35 characteristics were selected to conduct the classification of color-leafed O. fragrans colour cultivars with the Q-type cluster analysis. 【Results】 The R-type clusters showed that several variables (whether the leaf surface was wrinkled or not, whether the lateral veins were uplifted or not, petiole color, whether the new branches were dichromatic or not, the convex-concave degrees of the transverse section and the main vein of the leaves, and whether there were spotted blades on the mature leaves or not), were all significantly correlated with the color and color type at each stage of the leaves. All the other factors were relatively independent. The PCA showed that 11 principal components were extracted, their cumulative contribution was 87.618%. The cumulative contribution of the top nine principal components was 81.157%, mainly reflecting leaf colour representation in all stages, leaf size, serrated leaf margin, and leaf shape. The results of the Q-type cluster showed that the 25 O. fragrans cultivars were divided into the following: two categories based on the color of mature leaves; three categories based on average leaf width; and 10 categories according to the leaf width, the young leaf color type, leaf cross section, leaf shape, and leaf texture. 【Conclusion】 In general, the color of mature leaves, the cross section of the blade and the leaf width may be the most important criteria and the basis for the classification of color-leafed O. fragrans cultivars. However, this needs to be explored and verified.
color-leafed Osmanthus fragrans / cultivar / numerical classification / clustering analysis / principal component analysis
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