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Isolation and identification of eight races of powdery mildew of roses (Podosphaera pannosa) (Wallr.: Fr.) de Bary and the genetic analysis of the resistance gene Rpp1

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Abstract.

Powdery mildew, caused by Podosphaera pannosa, is one of the most-severe diseases of roses grown under glass. The differentiation into physiological races and the genetic analysis of resistance in a segregating host population was investigated using single conidial isolates of the pathogen. Using ten rose genotypes, all eight isolates of the pathogen could be ascribed to different races. Five races were isolated from one location, which indicates that populations of P. pannosa exhibit a high racial diversity. Infection experiments in a backcross-population of 114 rose plants resulted in a 1:1 segregation, suggesting control by a single dominant gene. Rpp1 is the first resistance gene against rose powdery mildew to be described.

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Acknowledgements

This project was supported by a grant of the Ministry of Economics, Technology and Transport of the Land Schleswig-Holstein, and by the companies W. Kordes Söhne (Germany) and Rosen Tantau (Germany). We thank K. Sabin for valuable technical assistance and Prof. A. Roberts (UEL, London) for critically reading the manuscript.

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  1. Federal Centre for Breeding Research on Cultivated Plants, Institute for Ornamental Plant Breeding, Bornkampsweg 31, D-22926 Ahrensburg, Germany

    M. Linde & Th. Debener

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  1. M. Linde
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  2. Th. Debener
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Correspondence to M. Linde.

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Communicated by F. Salamini

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Linde, M., Debener, T. Isolation and identification of eight races of powdery mildew of roses (Podosphaera pannosa) (Wallr.: Fr.) de Bary and the genetic analysis of the resistance gene Rpp1. Theor Appl Genet 107, 256–262 (2003). https://doi.org/10.1007/s00122-003-1240-1

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  • DOI: https://doi.org/10.1007/s00122-003-1240-1

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