extremely significantP < .005
juncea introgression lines in the BC 1 S 1 population showed extremely significant differences ( P < .005) from the expected results (A:B:H = 1:5:2), indicating that the progenies tended to retain the B. rapa genome in the process of distant hybridization of B. juncea and B. rapa , and existed in the form of heterozygosity.