standard set of host differentials and unified nomenclature for an international collection of Diplocarpon rosae races

Black spot of rose is distributed throughout the world and is the most serious disease of roses (Rosa spp.) in the outdoor landscape. Resistance breeding has been frustrated by the occurrence of races of the causal pathogen Diplocarpon rosae. Races from Germany, North America and the UK have been ch...

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Veröffentlicht in:Plant pathology 2010-08, Vol.59 (4), p.745-752
Hauptverfasser: Whitaker, V.M, Debener, T, Roberts, A.V, Hokanson, S.C
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creator Whitaker, V.M
Debener, T
Roberts, A.V
Hokanson, S.C
description Black spot of rose is distributed throughout the world and is the most serious disease of roses (Rosa spp.) in the outdoor landscape. Resistance breeding has been frustrated by the occurrence of races of the causal pathogen Diplocarpon rosae. Races from Germany, North America and the UK have been characterized and maintained in a pathogenic state. However, these races were characterized using independent sets of host genotypes and are referenced using different nomenclatures. In the present study, a total of 15 D. rosae isolates from these locations, as well as Belgium and Italy, were inoculated to a common set of 15 rose cultivars in replicated, detached leaf trials. Baby LoveTM (cv. Scrivluv) was resistant to all isolates except for one originating from the UK. The rose cultivars Mrs Doreen Pike (Ausdor) and Hansa were resistant to all isolates except for one originating from Minnesota, USA. No rose genotype was universally susceptible. A total of 11 pathogenic races were differentiated based on their unique host ranges and were assigned an international race nomenclature. Nine cultivars are proposed as the first standard set of differential genotypes for characterization of D. rosae races.
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Resistance breeding has been frustrated by the occurrence of races of the causal pathogen Diplocarpon rosae. Races from Germany, North America and the UK have been characterized and maintained in a pathogenic state. However, these races were characterized using independent sets of host genotypes and are referenced using different nomenclatures. In the present study, a total of 15 D. rosae isolates from these locations, as well as Belgium and Italy, were inoculated to a common set of 15 rose cultivars in replicated, detached leaf trials. Baby LoveTM (cv. Scrivluv) was resistant to all isolates except for one originating from the UK. The rose cultivars Mrs Doreen Pike (Ausdor) and Hansa were resistant to all isolates except for one originating from Minnesota, USA. No rose genotype was universally susceptible. A total of 11 pathogenic races were differentiated based on their unique host ranges and were assigned an international race nomenclature. 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subjects Biological and medical sciences
Black spot
black spot of rose
Diplocarpon rosae
disease resistance
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Genotypes
Landscape
Leaves
Marssonina rosae
Nomenclature
pathogenic phenotypes
Pathogens
Phytopathology. Animal pests. Plant and forest protection
Plant breeding
Rosa
Rosa spp
title standard set of host differentials and unified nomenclature for an international collection of Diplocarpon rosae races
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