Genetic model analysis of plant height in Cucumis sativus L.

The method of quantitative traits heredity model was used in the analysis of the genetic effects of cucumber plant height.Six generations of P1,P2,F1,BC1,BC2 and F2 derived from the cross of dwarf line D8 and long vine line JIN5 of cucumber were obtained.The genetic effects of plant height based on the major gene and polygene mixed genetic model were analyzed.The results showed that the heredity of plant height could be explained by D-1 genetic model,which was an additive-dominance major and additive-dominance polygene model.The additive effect value of the major gene was 31.06.The dominance effect value of the major genes was forward 5.76 and the dominant degree was 0.19.The heritability of major gene had a wide rang,in the three generations of BC1,BC2 and F2,the estimated values were 36.88%,61.89% and 70.03%,respectively.The heritability of major gene in F2 was the highest and the heritability of major gene in BC1 was the lowest.The heritability of polygene were 9.85%,12.37% and 30.61%,respectively,while F2 was the lowest and BC1 was the highest.The plant height in cucumber was determined by the combined of major gene and polygene,mainly by the major gene.The selection in early generations may be effective in cucumber breeding.