在西欧各国,选育单果型甜菜品种,一般都采用先育成单果型甜菜雄性不育系。用单果型雄性不育系与四倍体品系进行杂交制种,再从单果型母本种株上采收单果三倍体种子用于大田播种这样的一种育种途径。他们选育单果型甜菜雄性不育系所使用的单果型原始材料,都是利用美国的单果材料。从美 In Western European countries, selection of single fruit type sugar beet varieties, generally adopt the male sterile line of bred monoculture beet. The monocotyledonous male sterile line and the tetraploid line are used for hybrid seed production, and then the fruit triploid seed is harvested from the fruit-type female parent plant for breeding such as field planting. The single fruit-type raw materials they use to breed single-fruit CMS lines are made from single fruit material from the United States. From the United States