Study On Morphological Variation And Selection Of Paulownia Hybrid

Take thirty-two single-cross and eighteen multi-parents hybridization of Paulownia in thirteen years as trial material, genetic and variation of many characters were studied. The results are 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 is discovered on angle of anthotaxy tresses. Split degree of calyces and length of bennet are controlled by a few alleles, and shallow is dominant to deep in split degree of calyces and long is dominant to short in length of bennet. In the aspect of flower color, white are homogeneous unit in gene, and purple is 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 have 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 can act as the first principal component, and thickness of fruit may act as the second principal component. Clustering of hybridization characters demonstrate43that the thirty-two hybrids can be divided into four groups. Correlation analysis shows that many of these characters are greatly correlated, so when selection for certain aims the correlation of correlated character should be concerned.Choose diameter of breast height as main object, the growth of fifty hybrids was studied and some good crosses and good single trees were selected, and analysing of selection effect indicate that genetic benefit are 18.14% and 42.29%.