在我省生态条件下,以我所育成的具陕2A血缘的甘蓝型油菜胞质雄性不育系1356A组配的三系杂交种秋播制种行比缩小,其杂种纯度显著提高;同时,在适宜播期范围内,不育系推迟播种,则杂种纯度有所提高;杂种纯度的高低与父母本的长势均密切相关,父本长势比母本愈强,开花量愈大,杂种纯度就愈高,而母本自身的长势愈强,营养体愈大,则杂种纯度就愈低。 Under the ecological conditions in our province, the hybrids of three lines which were bred in the CMS line 1356A of Brassica napus with the 2A bloodline of Shaanxi were narrowed in autumn and the hybrid purity was significantly increased. At the same time, Within the range of suitable sowing date, the purity of hybrids increased after the delayed sowing of sterile lines. The purity of hybrids was closely related to the growth of parents. The male parent grew stronger than that of female parent, The higher the mother’s own growing stronger, the larger the nutrient body, the lower the purity of hybrids.