Prevalence of ToxA-sensitive alleles of the wheat gene Tsn1 in Australian and Chinese wheat cultivars
Richard P. Oliver A B , Kasia Rybak A , Peter S. Solomon A and Margo Ferguson-Hunt AA Australian Centre for Necrotrophic Fungal Pathogens, Faculty of Health Sciences, Murdoch University, Murdoch, WA 6150, Australia.
B Corresponding author. Email: roliver@murdoch.edu.au
Crop and Pasture Science 60(4) 348-352 https://doi.org/10.1071/CP08259
Submitted: 8 August 2008 Accepted: 3 February 2009 Published: 21 April 2009
Abstract
A recent survey of worldwide isolates of Stagonospora nodorum showed that all Australian isolates expressed the host-specific toxin ToxA (Stukenbrock and McDonald 2007). In contrast, very few Chinese isolates did. All the Australian Pyrenophora tritici-repentis isolates that were tested expressed ToxA. We therefore postulated that the wheat gene that confers sensitivity to ToxA, Tsn1, would vary in prevalence in wheat cultivars in use in the two countries. Contrary to expectation, 10 out of 21 Chinese cultivars responded to ToxA as did 26 out of 46 Australian cultivars. The result suggests that ToxA has not had a determining effect on the survival of wheat cultivars in either country. They also suggest that despite the widespread use of Tsn1 markers in Australia, sensitive alleles are still commonplace. The removal of sensitive alleles from breeders’ lines could be readily achieved and could significantly affect the resistance of wheat to both diseases.
Acknowledgments
This work was funded by the Australian Grains Research and Development Corporation (UMU00027 and UMU00022). We thank the AWCC for the wheat cultivars, and Bruce McDonald and Eva Stukenbrock (ETH Zurich), and Tim Friesen and Justin Faris (USDA, North Dakota), for helpful comments and collaboration.
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