花椰菜自交系主要形态性状的主成分分析和聚类分析

通过对54个花椰菜自交系材料进行主成分分析和聚类分析研究,以期为花椰菜育种中亲本选配提供帮助。结果表明:在主成分分析中,选取方差累积贡献率为70.024%的前6个主成分来评价花椰菜自交系资源;现球期、采收期、叶长、叶宽、株高、花球纵径、花球横径、球重、球形、球紧实度、叶色、蜡粉、内叶数、始花期和株幅是花椰菜亲本选择的主要形态指标。进一步通过系统聚类,将54个花椰菜自交系分为3类:第Ⅰ类表现为早熟、株幅小、叶片狭窄、蜡粉较少、球重和紧实度中等;第Ⅱ类表现为中熟、株幅中等、叶片灰绿、蜡粉较厚和花球半圆紧实且重;第Ⅲ类表现为晚熟、株幅大、株形高、叶片宽阔、蜡粉中等和花球扁圆。3个类群自交系性状之间的差异较为明显,有利于杂交育种亲本材料的选择。

Principal Component Analysis and Cluster Analysis for Main Morphological Characteristics of Cauliflower Inbred Lines

Classification of cauliflower resource was useful for heterosis and hybridization selection.54 cauliflower inbred lines were analyzed with statistical methods of cluster analysis and the principal component analysis(PCA).The PCA results showed that,the six eigenvalues of cumulative variance proportion 70.024% were selected for evaluation of inbred line of cauliflower;Days to curd appearing,days to curd harvesting,leaf length,leaf width,plant height,lengthways diameter of curd,transverse diameter of curd,curd weight,curd shape,tight degree,leaf color,wax powder,leaf number inside,days to flowering and plant extent were morphological characteristics for parents screening.By cluster analysis under the results of PCA,54 cauliflower inbreed lines were classified into 3 clusters.Characters of clusterⅠwere early maturity,little plant extent,narrow leaf with less wax,moderate weight and tight degree of curd;Cluster Ⅱ had the characters of middle maturity,moderate plant extent,sage green leaves with thick wax,and weighty curd with tight semicircular;Cluster Ⅲ was type of late maturity,high stalk,large plant extent,more length and width leaves with moderate wax,and oblate curd.Three clusters had obvious feature,so that it would be helpful for parent materials selection in breeding.