弱光下黄瓜幼苗叶片叶绿素含量的遗传分析

Genetic Analysis on Chlorophyll Contents of Cucumber Seedling under Low Light

采用两种不同的遗传方法,分析弱光下黄瓜自交系M22、M14及其6个世代幼苗叶片总叶绿素含量的遗传效应,以期能从基因作用方面阐明黄瓜耐弱光遗传机制。6个世代联合遗传分析方法研究结果表明,弱光下总叶绿素含量遗传符合加性-显性-上位性多基因遗传模型,B1、B2、F2多基因遗传率分别为41.60%,43.68%和68.13%。应用世代平均数分析方法进行遗传效应估计,结果表明,叶绿素含量遗传符合加性-显性-上位性遗传模型,其中平均显性度为2.001,为超显性遗传。研究结果表明,控制黄瓜总叶绿素含量性状基因间为加性-显性-上位性作用,以微效多基因为主,受环境影响较大,不宜进行早代选择。

The genetic effects of chlorophyll contents of cucumber inbred lines（M22, M14）and their six generations seedling under low light was analyzed by using tow different genetic methods. The principle of genetics was studied with joint analysis of six generations and the results indicated that the chlorophyll contents of B1 , B2, F2 under low light fit to a major gene plus additive-dominance-epistasis polygene model, and the polygene heritability are 41.60%, 43.68 % and 68.13% respectively. The genetic effect was studied by the generation average method, the result indicated that the chlorophyll contents also fit to additive-dominance-epitasis model, the degree of mean dominance is 2.001, which indicated the exceed inheritance. This study indicated that the genes which control the whole chlorophyll contents are additivedominanee-epitasis and most are rain-effect polygene, so this is affected by environment easily, does not fit to the earlier choice.