早熟甘蓝型油菜抗裂角性鉴定及材料筛选

为筛选适宜在早熟油菜产区种植的抗裂角油菜品种,推动早熟油菜产区机械化生产进程,本实验采用随机碰撞法对98份早熟甘蓝型油菜材料进行抗裂角指数(SRI)测定,并结合相关农艺性状对测定结果进行聚类和相关性分析.结果表明,SRI变异系数为41.38％;SRI≥0.4(具有抗裂角能力)的材料占68.4％.98份材料被聚为A、B、...

Identification of Pod Shattering Resistance of Early-maturing Brassica napus L. and Material Screening

To screen pod shattering resistant varieties and to promote the mechanized production process of rapeseed (Brassica napus L.) in areas of early-maturing varieties, pod shattering resistance index (SRI) of 98 early-maturing Brassica napus L. materials was assessed with random impact test method. The testing results were analyzed by cluster analysis and correlation analysis in combining with related agronomic traits. The results showed that the coefficient of variation (CV) of SRI was 41.38%, and the materials with SRI≥0.4 accounted for 68.4%. The cluster analysis demonstrated that the 98 early-maturing Brassica napus L. materials were clustered into three groups: A, B, and C. The average SRI of group A was 0.35, presenting easy shattering. The average SRI of group B was 0.93, presenting high resistance to shattering. The average SRI of group C was 0.65, presenting moderate resistance. The correlation analysis with main agronomic traits showed that SRI had an extremely and significantly positive correlation with pod length and a significantly positive correlation with 1000-seed weight, indicating that pod length and 1000-seed weight significantly affected pod shattering resistance, and both the two indexes could be used in shattering resistance screening of Brassica napus L.. Finally, the test materials with SRI>0.4 were screened in terms of yield and oil content, and 10 materials which had higher SRI and 5% more yield increase compared with that of CK (‘HY8’) were screened out. The study could provide theoretical guidance for phenotypic identification, genetic analysis and molecular marker-assisted selection of pod shattering resistance in early-maturing Brassica napus L..