芥菜型油菜与埃塞俄比亚芥种间可交配性的遗传分析

Genetic Analysis of the Interspecific Crossability Between Brassica juncea and Brassica Carinata

以10个芥菜型油菜品种为母本,3个埃塞俄比亚芥品种为父本,按不完全双列杂交试验方式,对种间可交配性的有关性状进行了遗传分析。结果表明,亲本、尤其是母本在种间可交配性上存在着较大的遗传变异。在受精能力上,主要取决于母本基因型,且以加性效应为主,其狭义遗传力高达83.79％;在杂交胚发育能力上,母本加性效应和亲本间互作效应均比较重要,且较易受环境影响,狭义遗传力较低。结角率和角果相对长度这两个反映种间可交配性的外观性状,分别与受精率和杂交胚发育率之间存在着显著的表型相关和遗传相关;而受精率与杂交胚发育率之间无显著的相关关系。

Genetic analysis of the interspecific crossability between Brassica juncea and Brassica carinata was proceeded by a method of incomplete diallel. Ten varieties of B.juncea and three varieties of B.carinata respectively acted as female parent and male parent. Results revealed that parent, especially female parent showed great heritable variation in interspecific crossability. Their fertilization ability mainly depented on genotype of female parent and expressed mainly additive effect. It' s narrow-sense heritability was as high as 83.79 percent . The additive effect of female parent and interactive effect of between parents were significant for the developmental capacity of crossed embryo. The developmental capacity of crossed embryo was affected easily by environment and it' s narrow-sense heritabilily was lower. The siliqua setting rate and the lengh of siliqua two of apparent character which reflect interspecific crossability existed penotypic correlation and genotypic correlation with the fertilization rate and the developmental rate of crossed embryo respectively. While syrificant correlation didn't exist between the fertilization rate and developmental rate of crossed embryo.