1997
DOI: 10.1139/g97-041
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Molecular mapping of resistance to Leptosphaeria maculans in Australian cultivars of Brassica napus

Abstract: Doubled haploid (DH) lines together with a cotyledon bioassay were employed for the molecular analysis of resistance to the blackleg fungus Leptosphaeria maculans in the Australian Brassica napus cultivars Shiralee and Maluka. We used bulked segregant analysis to identify 13 RAPD and two RFLP markers linked to the resistance phenotype and mapped these markers in the segregating DH population. Our data suggest the presence of a single major locus controlling resistance in the cultivar Shiralee, confirming our p… Show more

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Cited by 64 publications
(59 citation statements)
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“…As expected, in both populations the resistance phenotype mapped as a single dominant locus to linkage group N7 (Mayerhofer et al 1997;Rimmer et al 1999). Further mapping in each population was targeted to the resistance gene regions by assessing only the phenotype of lines with recombination events between the markers flanking the resistance loci, with the most extensive mapping carried out in the Shiralee population.…”
Section: Resultssupporting
confidence: 72%
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“…As expected, in both populations the resistance phenotype mapped as a single dominant locus to linkage group N7 (Mayerhofer et al 1997;Rimmer et al 1999). Further mapping in each population was targeted to the resistance gene regions by assessing only the phenotype of lines with recombination events between the markers flanking the resistance loci, with the most extensive mapping carried out in the Shiralee population.…”
Section: Resultssupporting
confidence: 72%
“…Genomewide analyses of the organization of NBS-LRR genes in Arabidopsis suggest that tandem duplications distribute and separate this class of resistance genes in the genome and contribute to the diversification of gene families (Arabidopsis Genome Initiative 2000; reviewed in Leister 2004). Linkage group N7 (alternative nomenclature LG6) has already been shown to be a valuable source of blackleg resistance loci, harboring at least five different loci (Ferreira et al 1995;Mayerhofer et al 1997;Rimmer et al 1999). It seems likely that the tandem duplication could harbor a homolog of LmR1, which although nonfunctional in Shiralee, might reveal the identity of one of the additional blackleg loci already assigned to N7.…”
Section: Discussionmentioning
confidence: 99%
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