栄養繁殖による菜種品種の形質保存 : 第1報 ハンバーグの繁殖経過

抄録

For the purpose of maintaining the hereditary characters, the experiments regarding the vegetative propagation were carried out from 1952 to 1954, using the rape-plant variety "Hamburg, " Generally, propagation methods can be divided as follows; (A) Allowing the vegetative development to continue from the end of December to April in green house, at temperatures 20°∼25°C, (B) Inducing the vegetative development again after the reproductive phase by (1) pinching axillary buds in spring (2) repeating pinching operation in flowers everyday or (3) topping the stem. Among those method (B)-(2) was found most usefull. By this method, leaf buds appeared from the axile of top parts in the middle of August. Such new leaf buds were used successfully for propagation by cutting. The buds on the middle to lower parts of the stem should be used. The temperature for cutting propagation. was found necessary to be kept at 20°C or higher, and the plant hormone "Ruton" should be used for good rooting.