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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| Authors: | Susan J Sprague Marie-Hélène Balesdent Hortense Brun Helen L Hayden Stephen J Marcroft Xavier Pinochet Thierry Rouxel Barbara J Howlett |
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| Institution: | (1) School of Botany, The University of Melbourne, VIC 3010, Australia;(2) CSIRO Plant Industry, GPO Box 1600, Canberra , ACT 2601, Australia;(3) INRA–PMDV, Route de St Cyr, 78026 Versailles Cedex, France;(4) INRA Agrocampus Rennes, UMR BiO3P, Domaine de la Motte, F-35653 Le Rheu, 35327 Cedex, BP, France;(5) Marcroft Grains Pathology, 3400 Horsham, Victoria, Australia;(6) CETIOM (Centre Technique Interprofessionnel des Oléagineux Métropolitains), Scientific Direction, BP4, 78850 Thiverval-Grignon, France |
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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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| Keywords: | blackleg Brassica rapa ssp sylvestris Phoma lingam resistance |
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