滇楸结实特性及果实性状变异研究

Study on Phenotypic Diversity of Fruits Character in Catalpa fargesii f.Duclouxii

在云南和贵州调查了滇楸9个群体的结实特性和果实的8个表型性状,采用巢式设计的方差分析、变异系数、相关及聚类分析等进行表型性状的遗传多样性分析。结果表明:果实的8个性状在种群间、种群内差异均达到极显著水平(p<0.01),表型性状的平均变异系数为31.03%,变化幅度为24.53%～39.28%;群体间表型分化系数为22.81%(10.91%～36.34%),种群内变异达到77.19%,明显大于种群间的变异22.81%。通过果实表型性状的聚类分析,将9个种群划分为3大类,表型性状没有依据种群的距离进行分类,群体间的表型变异表现为不连续。

The phenotypes variation of 9 populations of Catalpa fargesii f duclouxii, 8 traits were investigated and the phenotype diversities within and inter-popula-tions were analyzed by adopting the methods of nested analysis of variance, coefficient of variation, correlation analysis and cluster analysis. The results showed that fruit traits among populations had reached a very significant level （ p 〈 0.01 ） differences within populations. The CV of phenotypic traits of the average was 31.03% ,with a change in the range of 24.53% to 39.28%. Phenotypie differentiation coefficient between populations （ 10.91% to 36.34% ） was 22.81%. The intra-pop- ulation phenotypic differentiation （77.19%） was significantly higher than the inter-population＇s （22.81% ）. According to the UPGMA cluster analysis of the populations of C. fargesii f duclouxii could be divided into three groups. These cluster results were not due to geographic distancesa and Phenotypic variation between groups showed discontinuous.