大约四十年前,日本主要种植白菜型的油菜。现在,却专种甘蓝型油菜。这些甘蓝型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。但用嫁接法就能取得良好效果,将上述两个物种用“劈接法”相互嫁接,不切去砧木的生长点,在接穗生出3--5片叶,而砧木生出8--10片叶时进行。偶而也从接穗 About forty years ago, Japan mainly planted cabbage-type rape. Now, but specialty of Brassica napus. Most of these cabbage varieties are bred from the 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. But grafting method can achieve good results, the above two species with “split method” grafting each other, do not cut off the growth point of the rootstock, spawn 3 - 5 leaves, and rootstock give birth to 8 - 10 Leaves when. Occasionally from the scion