Abstract: Inheritance of the fruit number per plant and individual fruit mass of summer squash in P₁,P₂,F₁,BC₁,BC₂ and F₂ from two crosses q-1×23-4G(cross 1) and q-1×A-7(cross 2) was investigated by the mixed major gene and polygene inheritance model of quantitative traits.The results showed that the fruit number per plant was controlled by D-2 model and the individual fruit mass was controlled by B-1 model.Additive effect mainly played role on cross 1 of fruit number per plant,while additive effect and dominant effect both played role on cross 2;But genetic effect of the individual fruit mass of two crosses were mainly dominant effect of major gene and dominant×dominant epastasis.Heritability value of the genes of F₂ was relatively high and environmental effect was relatively low;These results indicated that fruit number per plant breeding of summer squash should be selected in early generation selection.To the individual fruit mass of summer squash,heritability values of the genes of F₂ was relatively low and environmental effect was relatively high;So high separated generations was effective on the individual fruit mass.

Key words: Summer squash, Fruit number per plant, Individual fruit mass, Major gene and polygene

CLC Number: 

• S642.6