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Discovery, characterisation and map** of wheat leaf rust resistance gene Lr71

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Abstract

A temporarily designated gene LrARK12c (identified from spelt wheat cv. Altgold Rotkorn) with an intermediate low infection type was found effective against prevalent Australian Puccinia triticina (Pt) pathotypes. The gene was mapped to chromosome 1B between markers Xgwm18 and Xbarc187, with linkage distances of 1.0 and 1.3 cM, respectively. While it was not possible to assign a definitive chromosomal arm location to LrARK12c, it maps close to the centromere based on physical map** of SSR marker loci using deletion lines. Other genes conferring resistance to Pt in chromosome 1B include Lr33, Lr44 and Lr46. Genetic analysis showed that LrARK12c and Lr44 are genetically independent. Comparisons of markers linked to LrARK12c and Lr46 indicate that Lr46 should be well distal to the centromere. Lr33 is not effective in the seedling stage with Australian Pt pathotypes, therefore question of possible allelism of LrARK12c and Lr33 cannot be resolved using Australian Pt pathotypes. Genetic studies, chromosome map** and allelism tests indicated that LrARK12c is a new and genetically independent leaf rust resistance locus, and hence it was designated Lr71 in accordance with the rules of wheat gene nomenclature.

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Acknowledgments

This work was financially supported by the Grains Research and Development Corporation of Australia. Prof. Friedrich J. Zeller and Dr. Sai L. Hsam (Technical University of Munich), Prof. Bob McIntosh (University of Sydney) provided certain materials for this study.

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Authors and Affiliations

  1. Plant Breeding Institute, The University of Sydney, Private Bag 4011, Narellan, NSW, 2567, Australia

    D. Singh & R. F. Park

  2. Institute for Crop Science and Plant Breeding, Bavarian State Research Centre for Agriculture, Am Gereuth 6, 85354, Freising, Germany

    V. Mohler

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  1. D. Singh
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  2. V. Mohler
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  3. R. F. Park
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Correspondence to D. Singh.

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Singh, D., Mohler, V. & Park, R.F. Discovery, characterisation and map** of wheat leaf rust resistance gene Lr71 . Euphytica 190, 131–136 (2013). https://doi.org/10.1007/s10681-012-0786-x

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  • DOI: https://doi.org/10.1007/s10681-012-0786-x

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