茎瘤芥茎/叶性状的遗传体系分析

以茎/叶性状不同的３个茎瘤芥自交系为亲本配制了２个杂交组合，对其P₁、P₂、F₁、F₂ 群体茎/叶性状的遗传体系应用主基因+多基因混合遗传模型分离分析方法进行了研究。结果表明：２个杂交组合的茎/叶性状遗传体系均由１对加性-显性主基因+加性-显性-上位性多基因（D-0）构成；F₂ 世代的主基因遗传率为60.17%～68.74%，多基因遗传率为6.83%～10.23%；主基因以加性效应为主，且均有不同程度的负向显性效应。

Genetic System Analysis of Stem/Leaf Characteristics in Tumorous Stem Mustard

Three inbred lines with different ratio of stem and leaf were used as parents and developed 2 hybrids. Their genetic systems in stem/leaf ratio of P₁，P₂，F₁ and F₂ were analyzed by method of joint segregation analysis of major gene plus polygenes mixed inheritance model．The results showed that the genetic systems in stem/leaf ratio of these 2 hybridized combinations were constructed by one pair of additive-dominant major genes plus additive-dominant-epistatic polygenes（ D-O）．Heritability of the major genes and polygenes in F₂ generations were 60.17%-68.74% and 6.83%-10.23%，respectively．The additive effects of the major genes were more important than their dominant effects，and dominant effects showed negative in various degrees in 2 hybrid ized combinations.