一、育种技术的发展在甘薯传到日本的初期,选择优良品种主要是利用自然结实、自然突变及无性系分离等方法。在容易开花结实的冲绳可以利用自然结实,而在九州以北则主要利用自然突变和无性系分离来选择优良品种。红赤、胡萝卜素源氏、浦和赤等利用自然突变育成的品种不胜枚举(Fujise,1965)。利用无性系分离育成 First, the development of breeding technology Sweet potato spread to Japan in the early, choose the best varieties is the use of natural and strong, natural mutation and clonal separation methods. In Okinawa, which is easy to flowering and strong, nature can be utilized, while in Kyushu, it is mainly natural mutation and clonal separation to select fine varieties. Varieties such as red, carotene, and Uranium have been developed using natural mutations (Fujise, 1965). Clonal breeding using cloning