細胞質雄性不稔系統을 利用한 油菜 Heterosis育種開發에 關한 硏究 第1報, 細胞質雄性不稔系統을 利用한 有用形質의 Heterosis 發現과 稔性回復力 調査

Studies on Heterosis Breeding in Rapeseed using Cytoplasmic Male Sterility Ⅰ. Heterosis of Agronomic Characters and Fertility Restoration in F1 Hybrids using C.M.S.

Cytoplasmic male-sterility line was found by Shiga in Japan. We have investigated the degree of heterosis of agronomic characters and ability of fertility restoration of F₁ from the cross between cytoplasmic male-sterilie line and 157 varieties as pollen parents of Korea, Japan and Europe. That result has appeared with highly desirable heterosis, particulary in yielding and most yield component characters except on 1,000 seed weight but plant height was tall and maturing was late. Ability of Fertility restoration of F₁ hybrids from Europe pollen parent varieties was 74% but that of Japanese pollen parent varieties was low as 5%. It seems that high yielding of F₁ from fertility non-restoration varieties may be caused by the polly cross.