Genetic Analysis of Flower Size and Related Characters in Petunia
In order to explore the inheritance law of petunia flower size,four generations of genetic populations(P1,P2,F1,F2)were constructed using the large-flowered and small-flowered inbred lines of petunia as parents.The main gene + polygene mixed genetic model analysis was carried out,and the genetic law was verified by crossing the F1 plant with the medium-flowered petunia line W115.Moreover,the F2 population was used to investigate 23 phenotypic traits including flower diameter,sepal length,leaf length etc.,and the correlation analysis of these traits was carried out.The results showed that the flower diameter of petunia(large flower vs.small flower)was controlled by two pairs of additive major genes(2MG-A),and the heritability of major genes was 95.38%;the offspring of the F1 crossing W115 showed a separation ratio of 1∶1 between the large-flowered individuals and medium-flowered individuals,and the chlorophyll content of leaves and bracts in medium-flowered plants was significantly higher than that in large-flowered plants(P<0.01).The phenotypic traits of F2 population derived from hybridization between large-flower and small-flower parents had abundant variation,and the coefficient of variation varied from 7.67%to 59.93%,with an average of 22.38%.Correlation analysis showed that there were certain correlations among the floral traits,leaf traits and between them,and the flower diameter was significantly positively correlated with the size of other organs,but significantly negatively correlated to some plant traits.
万方数据
维普
