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Major gene and polygenic resistance to Leptosphaeria maculans in oilseed rape (Brassica napus)

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Sustainable strategies for managing Brassica napus (oilseed rape) resistance to Leptosphaeria maculans (phoma stem canker)

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.

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Authors and Affiliations

  1. INRA-Agrocampus Rennes, UMR APBV, BP 35327, 35653, Le Rheu Cedex, France

    R. Delourme, A. M. Chèvre & M. Renard

  2. INRA-Agrocampus Rennes, UMR BiO3P, BP 35327, 35653, Le Rheu Cedex, France

    H. Brun

  3. INRA, PMDV, Route de St-Cyr, 78026, Versailles Cedex, France

    T. Rouxel & M. H. Balesdent

  4. Instituto Superior de Agronomia, Technical University of Lisbon, 1349-017, Tapada da Ajuda, Lisbon, Portugal

    J. S. Dias

  5. Institute of Land and Food Resources, University of Melbourne, 3010, Victoria, Australia

    P. Salisbury

  6. Agriculture and Agri-Food Canada, Saskatoon Research Centre, 107 Science Place, S7N 0X2, Saskatoon, Saskatchewan, Canada

    S. R. Rimmer

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  1. R. Delourme
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Delourme, R. et al. (2006). Major gene and polygenic resistance to Leptosphaeria maculans in oilseed rape (Brassica napus). In: Fitt, B.D.L., Evans, N., Howlett, B.J., Cooke, B.M. (eds) Sustainable strategies for managing Brassica napus (oilseed rape) resistance to Leptosphaeria maculans (phoma stem canker). Springer, Dordrecht. https://doi.org/10.1007/1-4020-4525-5_4

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