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Major gene resistance in Brassica napus (oilseed rape) is overcome by changes in virulence of populations of Leptosphaeria maculans in France and Australia

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Abstract

Resistance of Brassica napus (oilseed rape, canola) conferred by three different major resistance genes has been overcome by changes in virulence of Leptosphaeria maculans populations in France and Australia. In South Australia where B. napus cultivars with major gene resistance derived from Brassica rapa ssp. sylvestris were grown extensively, resistance was rendered ineffective within 3 years of commercial release of the cultivar. Disease severity was higher on cultivars with sylvestris-derived resistance than cultivars with polygenic resistance. This Australian situation is compared to that in France, where resistance conferred by the Rlm1 gene was overcome nation-wide in 5 years under commercial cropping practices, and also where a source of resistance introgressed into B. napus from B. juncea was rendered inefficient in 3 years in experimental field plots near Rennes.

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Authors and Affiliations

  1. School of Botany, The University of Melbourne, VIC 3010, Australia

    Susan J. Sprague, Helen L. Hayden & Barbara J. Howlett

  2. CSIRO Plant Industry, GPO Box 1600, Canberra , ACT 2601, Australia

    Susan J. Sprague

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

    Marie-Hélène Balesdent & Thierry Rouxel

  4. INRA Agrocampus Rennes, UMR BiO3P, Domaine de la Motte, F-35653 Le Rheu, 35327, Cedex, BP, France

    Hortense Brun

  5. Marcroft Grains Pathology, 3400, Horsham, Victoria, Australia

    Stephen J. Marcroft

  6. CETIOM (Centre Technique Interprofessionnel des Oléagineux Métropolitains), Scientific Direction, BP4, 78850, Thiverval-Grignon, France

    Xavier Pinochet

Authors
  1. Susan J. Sprague
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  2. Marie-Hélène Balesdent
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  3. Hortense Brun
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  4. Helen L. Hayden
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  5. Stephen J. Marcroft
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  6. Xavier Pinochet
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  7. Thierry Rouxel
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  8. Barbara J. Howlett
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Corresponding author

Correspondence to Barbara J. Howlett.

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Sprague, S.J., Balesdent, MH., Brun, H. et al. Major gene resistance in Brassica napus (oilseed rape) is overcome by changes in virulence of populations of Leptosphaeria maculans in France and Australia. Eur J Plant Pathol 114, 33–40 (2006). https://doi.org/10.1007/s10658-005-3683-5

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  • DOI: https://doi.org/10.1007/s10658-005-3683-5

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