Genetic Analysis of the Main Agronomic Traits of DH Population in Brassica oleracea var.capitata

The segregation analysis method of identifying mixed major genes and polygenes by using a doubled haploid(DH) population derived from F_1 microspore culture of a cross between 624 and 24-5 was conducted to study the inheritance of 8 agronomic traits in cabbage.Except the plant spreading showed a mod- el of polygenes,the other inheritances of the 7 traits showed the models of two major genes plus polygenes. The largest petiole length had the highest heritability of major genes of 90.44%,the heritability of the largest leave width was 67.22%,basic stem length and core length had a lower heritability of major genes of 58.62% and 56.00%,head height had the lowest heritability of major genes of 20.30%,the next are the largest leave length and plant height of 23.32% and 31.74%,respectively.Head height had the highest heri- tability of polygenes of 49.80%.The influence of environment on trait of the plant spreading was the best, the environmental variance was 81.35% of phenotypic variance.The influence of environment on trait of the petiole length was the least,the environmental variance was 9.56% of phenotypic variance.