Journal article

Changes in allele frequencies of avirulence genes in the blackleg fungus, Leptosphaeria maculans, over two decades in Australia

Angela P Van de Wouw, Barbara J Howlett, Alexander Idnurm



Cultivation of canola (oilseed rape, rapeseed; Brassica napus) in many parts of the world relies on the use of cultivars carrying resistance genes that recognise avirulence products of the major canola pathogen, Leptosphaeria maculans. However, widespread cultivation of plants with such resistance provides the potential for evolution of the pathogen population to overcome resistance by altering the proportion of avirulence v. virulence alleles. In this study, the frequencies of avirulence genes were measured for 2091 Australian isolates dating from the late 1980s to present. Frequencies of avirulence genes changed over time. Analysis of isolates from the Eyre Peninsula, where canola is inten..

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Funding Acknowledgements

We thank the Australian Grains Research and Development Corporation for supporting this research. We thank Andrew Ware (South Australian Research and Development Institute) and Tim Richardson (Carrs' Seeds, Cummins, SA) for information regarding seed sales on the Eyre Peninsula.