Brassica napus (AnAnCnCn) is an important oil crop not only in China even in worldwide, and is a typical allotetraploid species undergone interspecific hybridization in Brassica species. In breeding process of B. napus, interspecific hybridization and introgression of exogenous genome is a frequent approach to broaden the genetic background of B. napus and create new genetic resource. Our laboratory has created new B. napus through the large-scale interspecific hybridization, which An genome or AnCn genome ...