Identifying resistance genes to Leptosphaeria maculans in Australian Brassica napus cultivars based on reactions to isolates with known avirulence genotypes
Steve J. Marcroft A , Vicki L. Elliott A , Anton J. Cozijnsen B , Phillip A. Salisbury C , Barbara J. Howlett B and Angela P. Van de Wouw B D
+ Author Affiliations
- Author Affiliations
A Marcroft Grains Pathology P/L, Grains Innovation Park, Horsham, Vic. 3400, Australia.
B School of Botany, The University of Melbourne, Vic. 3010, Australia.
C Melbourne School of Land and Environment, The University of Melbourne, Vic. 3010, Australia; Department of Primary Industries, Horsham, Vic. 3401, Australia.
D Corresponding author. Email: apvdw2@unimelb.edu.au
Crop and Pasture Science 63(4) 338-350 https://doi.org/10.1071/CP11341
Submitted: 20 December 2011 Accepted: 13 April 2012 Published: 19 June 2012
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.
Additional keywords: ascospore shower, adult plant resistance, avirulence genes, blackleg, Brassica juncea, canola.
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