四川甘蓝型油菜地方种和推广品种休眠特性的比较研究

对52份四川甘蓝型油菜地方种和24份四川推广品种作了收获前种子发芽试验,研究了四川 甘蓝型油菜的休眠特性。结果表明四川甘蓝型油莱品种间的休眠期差异达显著水平,抗收获前发芽 资源数量少;地方种与推广品种间发芽指数差异不显著,但发芽率和发芽指数的变幅及分布差异达 0．05显著水平,四川甘蓝型油菜推广品种发芽指数的分布较地方种更集中于低和高的范围内;根据 材料发芽进程和发芽指数进行聚类分析,将推广品种聚为三类:第一类为第1天发芽高峰类型,第二 类为第1、2天发芽高峰类型,第三类为抗收获前发芽类型;地方种聚为四类,比推广品种多一种类 型:第1、2天发芽高峰类型。鉴定筛选的四川甘蓝型油菜抗收获前发芽的宝贵资源及其休眠特性,将 为甘蓝型油菜的抗收获前发芽生理研究和育种提供信息和材料。

The Comparing Study on Dormancy Characterization of Sichuan Rape (Brassica napus L.)

52 Sichuan rape (Brassica napus L.) landraces and 24 varieties (Brassica napus L.) released in Sichuan province were used in the evaluation of the dormancy characterization. Results were shown as follows: the difference of the materials was significant at 0.05 level; There were few materials resistant to preharvest sprouting were recovered. The difference of the range and distributions of sprouting ratio and germination indexes was significant at 0.05 level between landraces and varieties but the difference of germination indexes was not significant. Compared to landraces, current varieties'' germination index tended to change in the low or high range. According to grain sprouting progress and germination index, the varieties were clustered into three groups, the first group was that germination peak value appeared at the first day; the second group was that germination peak value appeared at the first and second days; the third group was resistance to preharvest sprouting. Landraces were clustered into four groups, one group was that germination peak value appeared at the first two days, and another three groups were same to the ones above. This research showed information for future research on resistance to preharvest sprouting.