Abstract
A set of 105 European wheat cultivars was assessed for seedling resistance and adult plant resistance (APR) to stripe (yellow) rust in greenhouse and field tests with selected Australian isolates of Puccinia striiformis f. sp. tritici (Pst). Twelve cultivars were susceptible to all pathotypes, and among the remainder, 11 designated seedling genes (Yr1, Yr3, Yr4, Yr6, Yr7, Yr9, Yr17, Yr27, Yr32, YrHVII and YrSP) and a range of unidentified seedling resistances were detected either singly or in combination. The identity of seedling resistance in 43 cultivars could not be determined with the available Pst pathotypes, and it is considered possible that at least some of these may carry uncharacterised seedling resistance genes. The gene Yr9 occurred with the highest frequency, present in 19 cultivars (18%), followed by Yr17, present in 10 cultivars (10%). Twenty four cultivars lacked seedling resistance that was effective against the pathotype used in field nurseries, and all but two of these displayed very high levels of APR. While the genetic identity of this APR is currently unknown, it is potentially a very useful source of resistance to Pst. Genetic studies are now needed to characterise this resistance to expedite its use in efforts to breed for resistance to stripe rust.
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Abbreviations
- APR:
-
Adult plant resistance
- CI:
-
Coefficient of infection
- Low IT:
-
Low infection type
- High IT:
-
High infection type
- Pst :
-
Puccinia striiformis f. sp. tritici
- Pgt :
-
Puccinia graminis f. sp. tritici
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Acknowledgments
The senior author would like to sincerely thank the University of Sydney for the provision of an International Postgraduate Research Scholarship, which enabled these studies to be conducted, and the Plant Breeding Institute for the provision of facilities. The authors would like to thank Mr M. Williams for valuable technical assistance in the course of this study, and acknowledge financial support from the Grains Research and Development Corporation, Australia.
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Colin R. Wellings seconded from NSW Department of Primary Industries.
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Pathan, A.K., Wellings, C.R., Bariana, H.S. et al. Evaluation of seedling and adult plant resistance in European wheat cultivars to Australian isolates of Puccinia striiformis f. sp. tritici . Euphytica 163, 283–301 (2008). https://doi.org/10.1007/s10681-008-9651-3
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DOI: https://doi.org/10.1007/s10681-008-9651-3