关键词: 蟹爪兰, DUS测试, 表型, 亲缘关系

Abstract:

Sixteen morphological characteristics，often used for DUS（Distinctness，Uniformity and Stability）testing，of 58 cultivars of Schlumbergera truncata were recorded for statistical analysis in order to reveal the variation of each characteristic and the principal component analysis and cluster analysis were performed by using the DPS software. The results showed that the maximum coefficient of variation of receptacle color was 62.74%，and the minimum coefficient of variation of inner perianth width was 10.35%. According to the cumulative contribution rate of variance 86.8%，10 principal components were extracted，and the characters leafy stem width，leafy stem length，the beginning of flowering，leafy stem type of margin notch，leafy stem depth of margin notch，flower length，inner perianth segments width，inner perianth segments color of marginal zone，flower width，receptacle color and pistil length above tube were screened out by the scores of each trait in principal component. Based on the results of cluster analysis，58 cultivars were divided into three groups according to the differences of 16 characteristics，and were further subdivided into six groups. Nine of the 10 cultivars clustered into class C had type of margin notch with obtuse serrated or dense serrated type，which indicated that the cultivars clustered into class C had genes of Schlumbergera bridgesii，so it is far away from class A and class B. The results showed that there was a wide range of polymorphisms among S. truncata cultivars in the DUS-test. The distance between classes could accurately reflect the relationship between cultivars.

Key words: Schlumbergera truncata, DUS testing, morphological characteristics, genetic relationship