西瓜强雌性状的遗传效应分析

 以强雌性西瓜品系BG1和普通花性型品系ZY10为材料配制杂交组合, 调查单株30节位内的 雌花比率, 利用主基因+多基因混合遗传模型多世代联合分析法, 对该组合的P₁、P₁、F1、F₂、BC₁P₁和BC₁P₂等6个世代群体的雌花率性状进行分析。结果表明: 西瓜强雌性状遗传受两对主基因的加性-显性-上位性模型控制(即B-1模型) , 主基因表现为隐性。第1和第2对主基因的加性效应值分别为33.46和5.17; 而显性效应值分别为- 20.56 和- 11.20。主基因遗传率在BC₁P₁和F₂世代中高达93.75%和94.32% , 在BC₁P₂世代中较低, 为60.91%。在该组合中不存在多基因的效应。

Genetic Analysis of Subgynoecious in Watermelon (Citrullus lanatus)

Subgynoecious watermelon (Citru llus lanatus) line BG1 and normal sexual line ZY10 were crossed in this study. Female flower p roportion within 30 nodes for each plant was counted. Six populations ( P₁ , P₂ , F₁ , F₂ , BC₁ P₁ and BC₁ P₂ ) derived from this crosswere used to investigate the inheritance of subgynoecious by using the mixed major gene and poly-gene inheritance models. The results indicated that subgynoecious in this combination was controlled by two major genes with additive-dominance-epitasis gene effects(B-1 model). While the major genes showed recessive expression, the additive effects of the 1 st and 2nd major genes were 33.46 and 5.17, respectively and their dominance effects were - 20.56 and - 11.20, respectively. Heritabilities of major genes in the BC₁ P₁ , BC₁ P₂ and F₂ populations were estimated as93.75% , 60.91% and 94.32%, respectively.