Difference in gene content of R blocks in the A and B genomes of B. juncea, as compared with the gene content reported in B. rapa (A) and A. thaliana.

MF2 - Most fractionated subgenome; MF1 - Medium fractionated subgenome; LF - Least fractionated subgenome.A - A genome; B - B genome; R - R block; LG - linkage group.CDS - coding sequence.*- The rows marked with an asterix indicate that the recorded CDS are unique to that LG.▴-Difference in gene numbers between B. rapa and A genome of B. juncea is observed because these genes are present in scaffold sequences of Brassica database (BRAD) but have not been recorded.