高山杜鹃'红珍珠'×马缨杜鹃杂交F1代表型性状遗传分析OA

Taking 60 F1 generation plants of Rhododendron'Wilgen's Ruby'(♀)×R.delavayi Franch(♂)as the experimental materials,the 12 phenotypic traits of branches,leaves and flowers of the hybrid population were measured by using statistical methods such as correlation analysis,principal component analysis and cluster analysis.The genetic diversity of the hybrid population was studied to explore the genetic variation law of phenotypic traits in the F1 generation of Rhododendron hybrids,in order to provide a reference for the selection of parents and the screening of excellent germplasm in the hybrid breeding of Rhododendron.The results showed that the variation coefficients of 12 phenotypic traits ranged from 13.74％—30.94％.The inheritance of plant height,branch length,the number of leaves,petiole length,inflorescence width,and the number of flowers tended to be medium to low,and the inflorescence height tended to be medium to high.And the traits including leaf area,leaf length,average leaf width,and maximum leaf width were greatly contributed by the maternal parent.Among the 66 pairs of correlation analysis,14 pairs reached very significantly positively correlated(P＜0.01),1 pair was very significantly negatively correlated(P＜0.01),and 2 pairs were positively correlated(P＜0.05).The results of principal component analysis showed that leaf area,leaf length,average leaf width,maximum leaf width,petiole length,inflorescence width,plant height and leaf number were the main indicators to distinguish the parent and hybrid F1 generation.Cluster analysis divided the 60 single plants of the hybird F1 generation into three taxa,and the clustering results fully reflected the characteristics of each group.