Genetic analysis of leaf area in melon(Cucumis melo L.) with major gene plus polygene mixed genetic model by using recombinant inbred lines(RILs) population

The inheritance law of leaf area in melon was studied for providing a theoretical basis for plant type and high photosynthetic efficiency breeding.Recombinant inbred lines(RILs)derived from the cross of WI998×3-2-2 with small leaflet and big leaflet were used to study the inheritance of melon leaf area by RIL mixed major gene plus polygene inheritance models.The results showed that the inheritance of leaf area fitted two pairs of epistatic recessiveness major genes plus no polygene model(B_1_5) in spring.The major gene heritability of RILs were estimated to be 98.93%,and the polygene heritability to be 0.In autumn,the inheritance of leaf area also fitted two pairs of epistatic recessiveness major genes plus no polygene model(B_1_5).The major gene heritability of RILs was estimated to be98.15%,the polygene heritability to be 0.Leaf area in melon was controlled by two pairs epistatic recessiveness major genes plus no polygene,and heritability leaf area was stable in different seasons,and also affected by the environment.