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19 June 2012 Identifying resistance genes to Leptosphaeria maculans in Australian Brassica napus cultivars based on reactions to isolates with known avirulence genotypes
Steve J. Marcroft, Vicki L. Elliott, Anton J. Cozijnsen, Phillip A. Salisbury, Barbara J. Howlett, Angela P. Van de Wouw
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Abstract

Blackleg disease, caused by the fungus Leptosphaeria maculans, is the major disease of canola (Brassica napus) worldwide. A set of 12 Australian L. maculans isolates was developed and used to characterise seedling resistance in 127 Australian cultivars and advanced breeding lines. Plant mortality data used to assess the effectiveness of seedling resistance in canola growing regions of Australia showed that Rlm3 and Rlm4 resistance genes were less effective than other seedling resistance genes. This finding was consistent with regional surveys of the pathogen, which showed the frequency of Rlm4-attacking isolates was >70% in fungal populations over a 10-year period. Differences in adult plant resistance were identified in a subset of Australian cultivars, indicating that some adult gene resistance is isolate-specific.

© CSIRO 2012
Steve J. Marcroft, Vicki L. Elliott, Anton J. Cozijnsen, Phillip A. Salisbury, Barbara J. Howlett, and Angela P. Van de Wouw "Identifying resistance genes to Leptosphaeria maculans in Australian Brassica napus cultivars based on reactions to isolates with known avirulence genotypes," Crop and Pasture Science 63(4), 338-350, (19 June 2012). https://doi.org/10.1071/CP11341
Received: 20 December 2011; Accepted: 1 April 2012; Published: 19 June 2012
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KEYWORDS
adult plant resistance
ascospore shower
avirulence genes
Blackleg
Brassica juncea
canola
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