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Resynthesis of Brassica juncea through interspecific crosses between B. rapa and B. nigra

Srivastava, A., Mukhopadhyay, A., Arumugam, N., Gupta, V., Verma, J.K., Pental, D., Pradhan, A.K.
Plant breeding 2004 v.123 no.2 pp. 204-206
Brassica rapa, Brassica nigra, oilseed crops, lines, interspecific hybridization, Brassica juncea, plant breeding, seed set
The objective of this study was to broaden the genetic base in oleiferous Brassica juncea by resynthesis, using 10 diverse parental lines of oleiferous B. rapa and two lines of B. nigra of both Indian and exotic origin. Out of 14 crosses attempted using B. rapa as the female parent, eight were successful. Embryo rescue was necessary to obtain interspecific plants. A total of 29 fertile interspecific plants were obtained after colchicine treatment. In the S2 generation, the expression of component characters in the majority of the resynthesized plants showed a negative trend. The resynthesized B. juncea lines are being maintained through repeated selfing and selection at each generation for desirable plant types. This process will continue till the progeny lines of the desirable plants achieve uniformity.