Morphological characterization of the interaction between Diplocarpon rosae and various rose species |
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Authors: | O. Blechert, T. Debener &dagger |
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Affiliation: | Federal Centre for Breeding Research on Cultivated Plants, Institute for Ornamental Plant Breeding, Bornkampsweg 31, 22926 Ahrensburg;and;University of Hannover, Faculty of Horticultural Sciences, Department of Applied Genetics, Herrenhäuser Str. 2, D-30419 Hannover, Germany |
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Abstract: | Blackspot, caused by Diplocarpon rosae , is the most severe and ubiquitous disease of garden roses, but information is lacking about genotype-specific forms of resistance and susceptibility of the host. Macro- and microscopic analyses of 34 rose genotypes with a defined monoconidial culture black spot inoculum identified susceptible and resistant rose genotypes and further genotype-specific subdivisions, indicating the presence of partial forms of resistance and different resistance mechanisms. In total, eight interaction types were characterized, five representing compatible (types 1–5) and three representing incompatible interactions (types 6–8). The incompatible interactions were characterized by the lack of any visible fungal structures beneath the cuticle (type 8), single-cell necroses (type 7) or necroses of larger cell clusters (type 6), the latter two types with penetration hyphae and haustoria in epidermal cells. |
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Keywords: | black spot hypersensitive response infection resistance rose breeding |
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