Co-localisation of the blackleg resistance genes Rlm2 and LepR3 on Brassica napus chromosome A10

The protection of canola (Brassica napus) crops against blackleg disease, caused by the fungal pathogen Leptosphaeria maculans, is largely mediated by race-specific resistance genes (R-genes). While many R-genes effective against blackleg disease have been identified in Brassica species, information...

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Bibliographic Details
Published in:BMC plant biology 2014-12, Vol.14 (1), p.387-387, Article 387
Main Authors: Larkan, Nicholas J, Lydiate, Derek J, Yu, Fengqun, Rimmer, S Roger, Borhan, M Hossein
Format: Article
Language:English
Subjects:
Analysis
Ascomycota - physiology
Binding sites
Brassica napus
Brassica napus - genetics
Brassica napus - metabolism
Brassica napus - microbiology
Brassica rapa
Breeding
Chromosome Mapping
Chromosomes
Chromosomes, Plant - genetics
Crops, Agricultural - genetics
Crops, Agricultural - metabolism
Crops, Agricultural - microbiology
Disease Resistance - genetics
Drug resistance in microorganisms
Enzymes
Genes
Genetic aspects
Genetic Markers
Genomes
Genomics
Glaciers
Infections
Leptosphaeria maculans
Plant Diseases - genetics
Plant Diseases - microbiology
Plant Proteins - genetics
Plant Proteins - metabolism
Plant resistance
Population
Rape plants
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Summary:The protection of canola (Brassica napus) crops against blackleg disease, caused by the fungal pathogen Leptosphaeria maculans, is largely mediated by race-specific resistance genes (R-genes). While many R-genes effective against blackleg disease have been identified in Brassica species, information of the precise genomic locations of the genes is limited. In this study, the Rlm2 gene for resistance to blackleg, located on chromosome A10 of the B. napus cultivar 'Glacier', was targeted for fine mapping. Molecular markers tightly linked to the gene were developed for use in mapping the resistance locus and defining the physical interval in B. napus. Rlm2 was localised to a 5.8 cM interval corresponding to approximately 873 kb of the B. napus chromosome A10. The recently-cloned B. napus R-gene, LepR3, occupies the same region of A10 as Rlm2 and analysis of the putative B. napus and B. rapa genes in the homologous region identified several additional candidate defense-related genes that may control Rlm2 function.
ISSN:1471-2229
1471-2229
DOI:10.1186/s12870-014-0387-z