Resistance of oilseedBrassicaspp. to blackleg caused byLeptosphaeria maculans

Complexities of Chromosome Landing in a Highly Duplicated Genome: Toward Map-Based Cloning of a Gene Controlling Blackleg Resistance in Brassica napus

“…Brassica crop species comprise primary diploids containing the A, B, or C genome, respectively, and amphidiploids, like B. napus (AACC), carrying a combination of two diploid genomes (U 1935). A complete hypersensitive resistance to L. maculans has been found in Brassica species containing the B genome, which is effective throughout the life of the plant (Roy 1984;Rimmer and Van Den Berg 1992). Such resistance loci have been identified and mapped in B. nigra, B. juncea, and B. carinata and a number of attempts have been made to transfer them into B. napus breeding lines through interspecific hybridization (Roy 1984;Sjö din and Glimelius 1988;Rimmer and Van Den Berg 1992;Struss et al 1992, Chèvre et al 1996Pang and Halloran 1996a).…”

“…A complete hypersensitive resistance to L. maculans has been found in Brassica species containing the B genome, which is effective throughout the life of the plant (Roy 1984;Rimmer and Van Den Berg 1992). Such resistance loci have been identified and mapped in B. nigra, B. juncea, and B. carinata and a number of attempts have been made to transfer them into B. napus breeding lines through interspecific hybridization (Roy 1984;Sjö din and Glimelius 1988;Rimmer and Van Den Berg 1992;Struss et al 1992, Chèvre et al 1996Pang and Halloran 1996a). The results have been promising; however, cotransfer of unwanted traits and low frequencies of recombination between the different species have complicated the development of blackleg-resistant oilseed cultivars by conventional breeding (Chèvre et al 1997).…”

Development of resistance against blackleg disease in Brassica oleracea var. botrytis through in silico methods

“…Brassica nigra (BB), B. oleracea (CC), and B. rapa (AA) are the primary diploid species, while Brassica carinata (BBCC), Brassica juncea (AABB) and B. napus (AACC) are amphidiploids that result from hybridization between corresponding pairs of the diploid species. The most promising source of resistance genes have been identified in Brassica 'B' genome of B. nigra, B. carinata, or B. juncea; that confer complete resistance to blackleg disease (Balesdent et al, 2001), which is effective throughout the life of plant (Roy, 1984;Rimmer and Van Den Berg, 1992). Absence of 'B' genome in vegetable B. oleracea and in oilseed rapes B. rapa and B. napus proposed these species susceptible to blackleg disease.…”

Monoclonal antibodies differentiate the weakly virulent from the highly virulent strain ofLeptosphaeria maculans, the organism causing blackleg of canola

“…Identification of V pathotypes immediately after infection is important for the control of the disease. Moreover, the development of resistant cultivars is perhaps the most significant weapon in blackleg control and resistance breeding can be facilitated by devising fast and reliable systems for pathotype classification (Gugel & Petri 1992, Rimmer & van den Berg 1992.…”