Stabilization of Resistance to Leptosphaeria maculans in Brassica napus-B. juncea recombinant lines and its introgression into spring-type Brassica napus - Chèvre, A. M; Brun, H.; Eber, F.; Letanneur, J. C; Vallee, P.; Ermel, M.; Glais, I.; Hua Li.; Sivasithamparam, K.; Barbetti, M. J.