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European Journal of Plant Pathology

, Volume 152, Issue 2, pp 493–502 | Cite as

Resistance evaluation of differentials and commercial wheat cultivars to stripe rust (Puccinia striiformis) infection in hot spot regions of Canada

  • Gurcharn Singh Brar
  • Raman Dhariwal
  • Harpinder Singh Randhawa
Article

Abstract

Stripe rust of wheat, caused by Puccinia striiformis f. sp. tritici (Pst), is one of the most important diseases of wheat in Canada. This study presents the results from resistance evaluation of Yr genes and western Canadian wheat cultivars from different milling classes, to natural infection in southern Alberta and British Columbia which are considered hot spots of stripe rust occurrence in Canada, due to proximity to Pacific Northwest of the United States where stripe rust epidemics are frequent. Genes Yr1, Yr5, Yr15, and YrSP were effective in all environments; Yr17 and Yr28, which were earlier reported ineffective to existing stripe rust races at the seedling stage in Canada, were effective at adult plant stages in most of the environments because of warmer climates in southerly locations, a favourable condition for expression of the genes. Yr17 is common in winter wheat cultivars and only reported spring wheat cultivar carrying it is CDC Stanley, which can serve as donor parent in breeding programs. Gene Yr24/26 was not very effective in western prairies although reported as effective in eastern prairies. Residual resistance from combination of defeated genes (Yr3, Yr7, Yr9, Yr27) in some supplementary differentials was observed. Most cultivars carry slow-rusting, pleiotropic adult-plant resistance gene Yr18 and some Yr29, which were effective in some locations. These genes failed to provide complete protection under high disease pressure. Seedling and adult plant resistance genes Yr5, Yr15, Yr17 and Yr18, Yr36, respectively could be good targets for resistance breeding. Stacking adult plant resistance genes with seedling resistance genes can provide durable resistance to stripe rust.

Keywords

Wheat Stripe rust Yellow rust Races Puccinia pathway Yr genes 

Notes

Acknowledgements

The authors greatly acknowledge the technical assistance from Mark Virginillo and Kelly Ryan.

Funding

The financial support from Alberta Wheat Commission, Alberta Crop Industry Development Fund (ACIDF) is acknowledged.

Compliance with ethical standards

Conflict of interest

The authors declare that there is no conflict of interest.

Human and animal rights

The research does not include any human or animal trials/subjects.

Ethical approval

The authors bear all ethical responsibilities for this research and manuscript.

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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 2018

Authors and Affiliations

  • Gurcharn Singh Brar
    • 1
  • Raman Dhariwal
    • 2
  • Harpinder Singh Randhawa
    • 2
  1. 1.Crop Development Centre/Department of Plant ScienceUniversity of SaskatchewanSaskatoonCanada
  2. 2.Lethbridge Research and Development Centre, Agriculture and Agri-Food CanadaLethbridgeCanada

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