Genetic Diversity Analysis of the Main Commercial Varieties of Brassica napus in Guizhou Province

This paper aims to investigate the genetic diversity of the main commercial varieties of Brassica napus in Guizhou Province at the molecular level. Nine main commercial rapeseed cultivars in Guizhou were detected by 40 pairs of SSR primers used in the national regional trial of B. napus, and then clustering analysis was carried out. A total of 191 bands were amplified, and 143 of them showed polymorphism among the nine rapeseed cultivars. By cluster analysis, the nine cultivars were divided into two groups. Group A included seven varieties, and group B consisted of two cultivars from Guizhou Institute of Oil Crops. Sub-group A1 included three cultivars from Guizhou Rapeseed Institute, and sub-group A2 included the other four cultivars from Guizhou Institute of Oil Crops. The cultivars bred by the same institute had similar genetic background. The cultivars from Guizhou Institute of Oil Crops showed wider genetic basis.