在冬油菜育种中,为了缩短育种周期,加快世代,目前国内普遍采取异地夏繁的办法。我们曾将夏收的材料送到四川茂汶和浙江上溪等地种植,结果只有22.1％的材料通过春化阶段,开花结实,且收获的种子细瘪。由于能通过春化阶段的植株冬性较弱,其后代的春性较强,在上海郊区易出现早苔、早花现象。另有大量的材料因不能通过春化被淘汰, In the winter rapeseed breeding, in order to shorten the breeding cycle and speed up the generation, at present, the common practice in different places in summer and summer is frequent. We have brought the summer harvest materials to Maowen, Sichuan Province and Shangxi, Zhejiang Province for planting. As a result, only 22.1% of the material passed through the vernalization stage, flowering strong, and the harvested seeds were deflated. Because of the vernalization stage of the winter is weak, its offspring spring strong, easy to appear in the suburbs of Shanghai morningglow, early flowering phenomenon. Another large number of materials can not be eliminated because of vernalization,