Abstract
Germplasm from Australia, China and India was screened for resistance to blackleg (phoma stem canker), caused by Leptosphaeria maculans, under Australian field conditions. More than half of the world’s races of L. maculans occur in Australia, and sites were chosen to encompass areas of high race diversity. Plots were sown into the previous season’s L. maculans-infested residues. Significant differences in response were observed among genotypes of both Brassica napus and B. juncea when tested in Victoria, South Australia and Western Australia. Significant differences in response were observed among B. juncea, but not B. napus genotypes, when tested in New South Wales. Differences in the relative degree of expression of host resistance were observed between some test sites in relation to Australian cultivars that either contained major gene-based resistance (e.g. Surpass 400) or those that effectively had only polygenic resistance (e.g. AV-Sapphire, Lantern, Monty, Rainbow and Trigold). Australian genotypes, especially of B. napus, are generally more resistant than the Chinese and Indian genotypes. The majority of the B. juncea genotypes from both China (e.g. Xinyou 5) and India (e.g. Rohini) showed a high level of resistance, while some B. napus genotypes (e.g. 04-P34, P617 and P624 from China) showed at least a low level of resistance. Promising Australian B. napus germplasm in particular may provide high levels of polygenic resistance to both India and China should the disease become established in one or both those countries.
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Li, C.X., Wratten, N., Salisbury, P.A. et al. Response of Brassica napus and B. juncea germplasm from Australia, China and India to Australian populations of Leptosphaeria maculans . Australasian Plant Pathology 37, 162–170 (2008). https://doi.org/10.1071/AP08005
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DOI: https://doi.org/10.1071/AP08005