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Identification and localization of molecular markers linked to the Lr9 leaf rust resistance gene of wheat

Theoretical and Applied Genetics volume 88, pages 110–115 (1994)Cite this article

Abstract

Near-isogenic lines (NILs) for the leaf rust resistance gene Lr9 were screened for polymorphisms at the molecular level. RAPD (random amplified polymorphic DNA) primers as well as RFLP (restriction fragment length polymorphism) markers were used. Out of 395 RAPD primers tested, three showed polymorphisms between NILs, i.e., an additional band was found in resistant lines. One of these polymorphic bands was cloned and sequenced. Specific primers were synthesized, and after amplification only resistant lines showed an amplified product. Thus, these primers define a sequence-tagged site that is specific for the translocated fragment carrying the Lr9 gene. A cross between a resistant NIL and the spelt (Triticum spelta) variety ‘Oberkulmer’ was made, and F2 plants were analyzed for genetic linkage. All three polymorphisms detected by the PCR (polymerase chain reaction) and one RFLP marker (cMWG684) showed complete linkage to the Lr9 gene in 156 and 133 plants analyzed, respectively. A second RFLP marker (PSR546) was closely linked (8±2.4 cM) to the Lr9 gene and the other four DNA markers. As this marker maps to the distal part of the long arm of chromosome 6B of wheat, Lr9 and the other DNA markers also map to the distal region of 6BL. All three PCR markers detected the Lr9 gene in independently derived breeding lines and varieties, thus proving their general applicability in wheat breeding programs.

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Affiliations

  1. Department of Plant Breeding, Swiss Federal Research Station for Agronomy, Zürich-Reckenholz, Reckenholzstrasse 191, Zürich, Switzerland

    G. Schachermayr, H. Siedler, H. Winzeler, M. Winzeler & B. Keller

  2. Cambridge Laboratory, Colney Lane, NR4 7UJ, Norwich, UK

    M. D. Gale

Authors
  1. G. Schachermayr
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  2. H. Siedler
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  3. M. D. Gale
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  4. H. Winzeler
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  5. M. Winzeler
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  6. B. Keller
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Communicated by G. Wenzel

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Schachermayr, G., Siedler, H., Gale, M.D. et al. Identification and localization of molecular markers linked to the Lr9 leaf rust resistance gene of wheat. Theoret. Appl. Genetics 88, 110–115 (1994). https://doi.org/10.1007/BF00222402

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  • DOI: https://doi.org/10.1007/BF00222402

Key words

  • Leaf rust
  • RAPD
  • RFLP
  • Triticum aestivum
  • Triticum spelta