黄瓜嫩果果皮叶绿素含量的遗传

 选用4个皮色性状不同的黄瓜品种配成正反杂交组合8个，测定结果表明相同亲本正反交组 合叶绿素含量差异不显著，表明黄瓜嫩果果皮叶绿素含量受核基因控制。应用植物数量性状主基因+多基因混合模型，对黄瓜嫩果果皮叶绿素低含量品种‘海阳白皮’与高含量品种‘济宁秋黄瓜’杂交组合的6个家系世代(P₁、F₁、P₂、B₁、B₂和F₂)进行群体叶绿素含量的多世代联合分析，结果显示：该组合叶绿素含量的遗传受2对加性一显性主基因+加性-显性多基因(E-2模型)控制。其B₁、B₂和F₂群体叶绿素含量主基因遗传率(h²_mg%)分别为83.94%、62.12%和86.98％，多基因的遗传率(h²_pg%)为5.86%-18.15%。主基因中加性效应明显，第一对主基因的加性效应值显著高于第二对主基因的效应值，2对主基因对叶绿素含量的贡献率差异较大。两主基因的显性效应差异不大，分别为2．7762(h_a)和2.3392(h_b )。多基因效应主要表现为显性效应h]，效应值为-5.5243。

Inheritance of the Chlorophyll Content in Immature Fruit Color of Cucumber

In this paper inheritance of the chlorophyll content in immature skin of cucumber was investigated by applying the major gene plus poly—genes model of quantitative traits to a joint analysis of multi—generations(P₁、F₁、P₂、B₁、B₂and F₂)．The results showed(1)the immature skin color of cucumber Was mainly controlled by nuclear genes.(2)the chlorophyll content in immature skin of the cross of HYBP×JNQHG Was controlled by two major genes with additive-dominance effects plus polygenes with additive-dominance effects(the E-2 model)．(3)heritability values of the major genes of B₁、B₂ and F₂ population were estimated as 83.94% ，62.12%and 86.98%respectively,while polygenes of those were 7.23%,18.15%and 5.86%.The results demonstrated that the chlorophyll content level in immature skin of the cross was mainly controlled by two major genes mixed with the efect of polygenes．The estimated additive efects of the first major gene(d_a )was much higher than that of the second one db．There were obvious diferences in genetic efects between the two major genes．The efect of db was only about 35.51% that of d_a，indicating that the contributions to the chlorophyl content level of the two major genes were not equal in the cross．The dominant efect of the two major genes，h_a and h_b were 2.7762 and 2.3392 respectively．