Rapeseed(Brassica napus L.,genome AACC,2n=38) is today the most widely cultivated crop species in crucifer(Brassicaceae) family.As one of the most important oil crops,rapeseed is annually planted 7.0×10~6 hectares in China which takes the first place in planting area and yield among rapeseed-growing countries. Rapeseed fatty acid composition determines the quality and the use of vegetable oil, the level of erucic acid content playing a key role in rapeseed edible consumption and industrial use.Erucic...