大约四十年前,日本主要种植白菜型的油菜,以生产植物油料。现在,却专种甘蓝型油菜。甘蓝型的各个品种大多数是通过甘蓝型和白菜型的种间杂交育成的。倘使用通常的杂交方法,则白菜型油菜和甘蓝两个物种是非常不亲和的,而且很难使得种间杂交所产生的新种的经济性状趋于稳定。作者为了追究这些问题,曾不断地研 About forty years ago, Japan mainly planted cabbage-type rape to produce vegetable oil. Now, but specialty of Brassica napus. Most of the varieties of cabbage are cultivated through interspecific cross between cabbage and cabbage. If the usual hybridization methods are used, the two species of Brassica campestris and cabbage are very unaffordable and it is very difficult to stabilize the economic traits of new species produced by interspecific hybridization. In order to investigate these problems, the author has studied continuously