一、前言在大面积生产上,油菜良种繁殖工作一向薄弱,长时期是以生产田兼种子田,或以商品菜籽做种用。因而,使油菜品种“多、乱、杂”和退化的现象比较普遍,有的地方十分严重。据在推广的油菜“老品种”田间调查,仅从株型、果型两个性状上表现出来的变异株率即达32%以上。针对在油菜生产上存在的问题,和油菜容易发 First, the preface In a large area of ​​production, the rapeseed breeding has always been weak, long period of production field and seed fields, or to use as a commodity rapeseed species. Therefore, the rape varieties “more, chaos, miscellaneous ” and the degradation of the phenomenon is more common, in some places is very serious. According to the promotion of rapeseed “old varieties ” field survey, only from the plant type, fruit type two traits showed mutant strains that is up to 32%. For rape problems in production, and rape easy to fat