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The genus Brassica organized around three genomes named A,B,and C.Comparative mapping of the diploid species,Brassica rapa (AA),Brassica nigra(BB),Brassica oleracea (CC) indicates that genomes of these species are probably derived from a common ancestor through duplication.The A and C genomes have been reunited in the tetraploid genome of Brassica napus (AACC),thus the closet similarity lies between the A and C genomes.Interspecific alien chromosome addition lines are very useful for the analysis of plant genome,genetic mapping,chromosome homology and have the ability of introducing valuable genetic traits of chromosome donor species into the recipient species.