泡桐杂种花的形态变异分析

对泡桐不同种间杂交后代花的性状进行了研究,多数性状在不同杂种间差异显著,花序长、花序宽及花序分枝角度等诸多性状受遗传控制较强。花序形状、花冠内斑点的疏密度及斑点大小等性状受多个基因控制,杂交后分化程度较高。萼裂的浅对深、总梗的长对短在遗传上表现为显性。多数性状之间存在着显著的相关性,主成分分析表明花序和果实特征在整体表现上占主导作用,可以作为泡桐杂种分析的主要因素,在进行杂种定向选择与培养时应兼顾相关性状的表达。

Analysis on Flowers of Morphology Variation of Paulownia Hybrid

Taking thirty-two single-cross and eighteen multi-parents hybridization of paulownia in twelve years as trial material,genetic and variation of many characters were studied.The results were as follows:all these characters demonstrate embulent variations among different crosses, and many of their difference reached a high level, heredity ability of main quantitative characters all reached a high level such as length of anthotaxy, width of anthotaxy, angle of anthotaxy tresses, length of flower stalk, length of flower, width of flower, length of fruit, width of fruit, and parents-excessed heredity was discovered on angle of anthotaxy tresses.Split degree of calyces and length of bennet were controlled by a few alleles,and shallow was dominant to deep in split degree of calyces and long was dominant to short in length of bennet. In the aspect of flower color,white were homogeneous unit in gene,and purple was incomplete dominant to white. The shape of anthotaxy,density and size of spot in crown,and shape of fruit are all qualitative characters and controlled by several genes,they had a great change in exhibition along with gene's re-organization and chang during the process of cross. Principal component analysis indicated that angle of anthotaxy tresses,length of anthotaxy,width of anthotaxy could act as the first principal component,and thickness of fruit may act as the second principal component.Correlation analysis showed that many of these characters were greatly correlated,so when selection for certain aims the correlation of correlated character should be concerned.