Abstract
Genetic analysis of resistance to leaf rust in rye (Puccinia recondita f. sp. secalis) led to the identification of two dominant resistance genes, Pr1 and Pr2. Both genes proved to be effective against a local leaf-rust population as well as a subset of single-pustule isolates (SPIs) the latter of which comprised SPIs with very high virulence complexity. Resistance conferred by Pr1 and Pr2 was expressed in detached-leaf tests of seedlings as well as in field tests of adult plants. Molecular marker analysis allowed us to map Pr1 in the proximal part of rye chromosome 6RL, whereas Pr2 was assigned to the distal part of chromosome 7RL. These results are discussed in view of homoeology relationships among Triticeae. A proposal is submitted for the designation of resistance genes to rye leaf rust which would avoid interference with existing gene-symboling in respect to wheat leaf-rust resistances introgressed from rye into wheat or triticale.
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Acknowledgements
We thank K.J. Leonard and M.E. Hughes (Cereal Disease Laboratory, USDA-ARS), as well as P.F. Bertrand (University of Georgia), Chair of the Committee for the Standardization of Common Names for Plant Diseases of the American Phytopathological Society, for helpful advice. This study was supported in part by the Deutsche Forschungsgemeinschaft (DFG) under project no. WE 2079/3-2.
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Wehling, P., Linz, A., Hackauf, B. et al. Leaf-rust resistance in rye (Secale cereale L.). 1. Genetic analysis and mapping of resistance genes Pr1 and Pr2 . Theor Appl Genet 107, 432–438 (2003). https://doi.org/10.1007/s00122-003-1263-7
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DOI: https://doi.org/10.1007/s00122-003-1263-7