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Major Gene and Polygenic Resistance to Leptosphaeria maculans in Oilseed Rape (Brassica napus) |
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| Authors: | R Delourme A M Chèvre H Brun T Rouxel M H Balesdent J S Dias P Salisbury M Renard S R Rimmer |
| Institution: | (1) INRA-Agrocampus Rennes, UMR APBV, BP 35327, 35653 Le Rheu Cedex, France;(2) INRA-Agrocampus Rennes, UMR BiO3P, BP 35327, 35653 Le Rheu Cedex, France;(3) INRA, PMDV, Route de St-Cyr, 78026 Versailles Cedex, France;(4) Instituto Superior de Agronomia, Technical University of Lisbon, 1349-017 Tapada da Ajuda, Lisbon, Portugal;(5) Institute of Land and Food Resources, University of Melbourne, 3010 Victoria, Australia;(6) Agriculture and Agri-Food Canada, Saskatoon Research Centre, 107 Science Place, S7N 0X2 Saskatoon, Saskatchewan, Canada |
| Abstract: | The most common and effective way to control phoma stem canker (blackleg) caused by Leptosphaeria maculans in oilseed rape (Brassica napus) is through the breeding of resistant cultivars. Race specific major genes that mediate resistance from the seedling stage have been identified in B. napus or have been introgressed from related species. Many race specific major genes have been described and some of them are probably identical in B. napus (allotetraploid AACC) and the parental species B. rapa (diploid AA). More work is needed using a set of well-characterised isolates to determine the number of different major resistance genes available. In some B. napus cultivars, there is resistance which is polygenic (mediated by Quantitative Trait Loci) and postulated to be race non-specific. Many of these major genes and Quantitative Trait Loci for resistance to L. maculans have been located on B. napus genetic maps. Genes involved in race specific and polygenic resistance are generally distinct. |
| Keywords: | blackleg host-pathogen interaction genetics quantitative resistance race specific resistance genes |
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