抄録
Vegetative variation of Yamato-Kurokawa (a variety of Dioscorea Batatas DECNE.) into Naga-Imo and Icho-Imo varities is described, 1. Even when the mother tubers were of normal form, about 0.4% in daughter tubers became long shaped as Naga-Imo-Variety and about 2.3% of the daughter tubers were found deformed, being partly shaped like a rod. 2. Naga-Imo tubers when propagated vegetatively produced only Naga-Imo continuously, and the deformed produced only deformed ones. 3. The varieties thus fixed contained more muchin and their tissues were more elaborated than those of the native Naga-Imo. From these facts, it may be considered that for cultivation of that crop in the future Naga-Imo, the newly fixed strains will take the place of the native Naga-Imo variety.
