무우의 抽臺, 開花 및 其他 몇가지 形質의 遺傳에 關한 硏究

Studies on Inheritance of Bolting, Flowering Time and Other Traits in Radish (Raphanus sativus L.)

This study was carried out to learn some informations for selection by investigating the inheritance of some characters and their heritabilities in the crosses between Korean and Japanese type of radishes. Red color showed dominance to colorless in hypocotyl and inflorescence junction, and it seemed to be controlled by one gene difference. The color of root-top was supposed to be governed by two duplicate genes. Continuous distributions were shown such morphological characters as number of parted leaflets, root length, root diameter and root shape index in F₂ population. It was assumed that polygenes might be related with the number of parted leaflets, root lenth and root diameter and a few major and minor genes with root shape. Polygenic control might be observed in root weight which was influenced, to a large extent, by the environmental conditions. Earliness was proved to be almost complete dominance in days to bolting and flowering. Means of F₂ populations were inclined to earliness and the distribution showed like a discontinuous curve, thus a few major genes governing bolting and flowering, and the minor genes deranging the activities of major genes. The narrow sense of heritabilities for seven characters mentioned above ranged from 0.473 to 0.990. In particular, those for days to bolting and flowering were high. Root diameter and root weight demonstrated the high heterotic effects and the latter severe inbreeding depression.