Variation analysis of important ornamental traits in F_2 hybrids of Iris dichotoma and I.domestica

We observed and measured14traits such as scape length,flower diameter,number,color and the colored sectors in each individual of 61F2 hybrid population of I.dichotoma×I.domestica,scape length,flower cliameter,number of flowers, flower color and colored sectors et al.The aims were to explore the variation traits and direct the breeding work in Iris.Four aspects of phenotypic difference between F2 hybrids and two parents,morphological traits variability,the correlation between the traits and color variability were analyzed.The results showed that 8traits from 12in F2 generation were among the parents.Ten traits had better normal distribution but not the flower diameter and flower number.It might imply that the ten were quantitative traits controlled by polygenic.There was a correlation among the 12traits.The correlation coefficients of outer tepal length and inner tepal length,outer tepal width and inner tepal were highest,0.821 and 0.734respectively,which suggested a linkage inheritance.Two color traits were controlled by multiple genes.In F2 hybrids,the variation were rich in flower diameter,flower number,scapes length and flower color,which might be conducive to the chosen of excellent varieties with larger diameter,more flowers,dwarf scape and novel flower colors.