【摘要】 为建立甘蓝型油菜发芽期低温耐性的鉴定及评价方法,筛选强耐低温材料,分别在22℃和9℃对66份材料进行发芽势、发芽率、发芽指数以及平均发芽时间的考察,利用隶属函数法进行综合评价,并通过聚类分析划分材料的低温耐性等级。结果表明:9℃低温会降低发芽势、发芽率和发芽指数,延长发芽时间。不同类型的品种间耐低温程度差异明显:中部品种的耐低温能力高于北部品种,半冬性性品种的耐低温能力高于春性品种与冬性品种,常规种的耐低温能力高于杂交种。单一指标与综合隶属函数值对品种的耐低温评价结果基本一致。筛选出极端耐低温品种H5(秦油8号×e6013)和敏感品种S10(汇丰一号)。更多还原

【Abstract】 To establish evaluation method for low temperature tolerance of rapeseed(Brassica napus L.) at germination stage, 66 rapeseed lines were investigated under the conditions of 22°C and 9°C. The parameters including germination potential, germination rate, germination index and mean germination time were investigated. After evaluation, materials were categorized by cluster analysis into different low temperature tolerance grades. The results showed that 9°C(low temperature) decreased germination potential, germination rate and germination index, it also prolonged germination time. The materials’ temperature tolerances were obvious among types: materials from midland were more tolerant than those from north, semi-winter-type lines were more tolerant than spring-and wintertype materials, conventional varieties were more tolerant than hybrids. The evaluation results from single indicators were consistent with those from comprehensive membership values. Among the 66 materials, H5(hybrid of Qinyou8 × e6013) was the extremely low-temperature-resistant variety, and S10(Huifeng 1) was the sensitive one.更多还原