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Vr 2 : a new apple scab resistance gene

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Abstract

Reports from several European countries of the breakdown of the Vf resistance, the most frequently used source of resistance in breeding programs against apple scab, emphasize the urgency of diversifying the basis of apple scab resistance and pyramiding different apple scab resistances with the use of their associated molecular markers. GMAL 2473 is an apple scab resistant selection thought to carry the resistance gene Vr. We report the identification by BSA of three AFLP markers and one RAPD marker associated with the GMAL 2473 resistance gene. SSRs associated with the resistance gene were found by (1) identifying the linkage group carrying the apple scab resistance and (2) testing the SSRs previously mapped in the same region. One such SSR, CH02c02a, mapped on linkage group 2, co-segregates with the resistance gene. GMAL 2473 was tested with molecular markers associated with other apple scab resistance genes, and accessions carrying known apple scab resistance genes were tested with the SSR linked to the resistance gene found in GMAL 2473. The results indicate that GMAL 2473 does not carry Vr, and that a new apple scab resistance gene, named Vr 2, has been identified.

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Acknowledgements

We thank Robert Liebhard for scientific advice, Eve Silfverberg-Dilworth and Lynn Hallstein for critical reading of the manuscript, and the Swiss National Foundation for Scientific Research, SPP-Biotechnology (grant no. 5002-045052) for financial support.

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Authors and Affiliations

  1. Plant Pathology Group, Institute of Plant Sciences, Swiss Federal Institute of Technology, 8092, Zürich, Switzerland

    A. Patocchi, B. Bigler, B. Koller & C. Gessler

  2. Agroscope FAW Wädenswil, 8820, Wädenswil, Switzerland

    M. Kellerhals

Authors
  1. A. Patocchi
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  2. B. Bigler
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  3. B. Koller
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  4. M. Kellerhals
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  5. C. Gessler
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Correspondence to A. Patocchi.

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Communicated by H. Nybom

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Patocchi, A., Bigler, B., Koller, B. et al. Vr 2 : a new apple scab resistance gene. Theor Appl Genet 109, 1087–1092 (2004). https://doi.org/10.1007/s00122-004-1723-8

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  • DOI: https://doi.org/10.1007/s00122-004-1723-8

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