Abstract: Selection of two capsicum hybridization combinations to build each six-generation populations, namely, F₁, F₂, backcrosses B₁ and B₂ and their parents P₁and P₂, whose seed number per fruit of Simudou were counted to study its genetic law.The results showed that seed number per fruit of isolated populations of two crosses displayed quantitatively genetic characteristics with multimodal or unimodal skewed distribution.Multigenerational joint segregation analysis indicated the heritance of seed number per fruit fitted the pattern of two additive-dominance-epitasis major genes(B-1 model).Genetic analysis of the 1st-order parameters showed that in two crosses there were almost the opposite performance in effects of additive, dominant, and additive×additive, exception of some similarity of epistatic interaction between the two loci in effects of additive×dominant, dominant×dominant.In addition, potential ratio comparison showed that the 1st and 2nd main genes were each expressed as negative, positive overdominant effect in the performance in crossⅠ, and positive and negative overdominance in crossⅡ, and integrated dominant effects partially offset between two loci.Genetic analysis of the 2nd-order parameters showed that in crossⅠtwo major gene QTLs determining seed number per fruit of capsicum were concentrated in parent 1110B, but in crossⅡwere distributed in both parents, furthermore, the major gene heritability of F₂ populations was 61.84% in crossⅠand 37.30% in cross Ⅱ, which indicated the seed number per fruit was dissimilar in different pepper germplasms, and suggested artificial selection of seed number per fruit should be performed at higher separated generations.

Key words: Chili pepper, Seed number per fruit, Joint analysis of multiple generations, Inheritance

CLC Number: 

• S641.03