油菜의 實用形質에 대한 遺傳硏究 2. 油菜의 穗長, 一次分枝數 및 二次分枝數에 대한 遺傳分析

Genetic studies in some agronomic characters in rapeseed(brassica napus L.) 2. Genetic Analysis for Ear Length, First Branch and Second Branch

To obtain basic information on the breeding of long ear length and multiple branch rapeseed varieties, the seven varieties, Isuzu, Miyuki, Norin 25, Rang, Yongdang, Cresus and Tower were used in diallel croses in 1979. Ear length, first branch and second branch per plant for the parents, F₁’s and F₂’s of the 7×7 partial diallel crosses were measured in 1981 for analysis of their genetic behavior and the results obtained indicated that the ear length of F₁’s showed complete dominance for long ear length, and both additive and dominance genetic variances were significant. Number of effective factors in F₁’s was three but in F₂’s was two. The degree of dominance in F₁’s and F₂’s was complete. The degree of dominance in F₁’s and F₂’s was partial in the first branch number. The direction of dominance showed high and three effective factors was estimated. First branch was controlled by recessive genes. The second branch was controlled by dominance and was directed toward high branch number one effective factors was estimated and broad and narrow sense heritability were high.