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Seedling and adult plant peaetions of Brassica napus-B. juncea recombinant lines towards A- and B-group isolates of Leptosphaeria maculans

Summary 
 
The Brassica napus-B. juncea recombinant lines MX and MXS carrying a B. juncea major gene (JLml) in the genetic background of a spring- or a winter type B. napus cultivar, respectively, were tested for their resistance level to Leptosphaeria maculans under controlled conditions. Inoculation with three A-and four B-group individual isolates and with different mixtures of isolates realised within or between these groups was performed on cotyledons, leaves and stems. Cotyledons and leaves of the two recombinant lines were more resistant to A-group isolates than those of B. napus cultivars, except for one isolate recovered from the MX line. The recombinant lines were susceptible at cotyledon stage and resistant on leaves to B-group isolates, as were B. napus cultivars. On stems, severe cortical damage was usually produced on B. napus cultivars by some A-group isolates, whereas B-group isolates induced pith blackening on all genotypes. Stems of the MX line and the resistant donor species (B. juncea cv. Picra) were more resistant than those of the susceptible B. napus (cv. Westar) to the individual A-group isolates. Cultivar Picra was the most susceptible genotype to pith infection caused by the B-group isolates. The consequence of the host pathogen differential interactions on the durability of the monogenic resistance to L. maculans introduced from B. juncea into B. napus is discussed.