Characterisation of powdery mildew resistance in a segregating diploid rose population

H Hosseini Moghaddam, L Leus, H Muylle, J De Riek, J Van Huylenbroeck, E Van Bockstaele

Research output: Contribution to journalA4: Article in journal not included in A1, A2 or A3


Powdery mildew (Podosphaera pannoso) is one of the most serious fungal diseases on both greenhouse and field grown roses. Improvement of disease resistance is a major selection aim for garden rose breeders. For rose cultivars, being mostly tetraptoid, it is complicated to develop molecular markers for resistance. Hence, a segregating diploid population was established from a cross between 'Yesterday', a commercial available rose variety susceptible to powdery mildew, and R. wichurana, a rose species with resistance to certain isolates of powdery mildew. A progeny of 94 seedlings was planted in the field. The segregation of powdery mildew resistance was studied in this population by means of a bioassay with two different monoconidial isolates of powdery mildew. Based on the response to these inoculations different groups were selected: a first group of genotypes was susceptible to both isolates, other groups were susceptible to one of both isolates and a last group was resistant to both tested isolates. The disease resistance inherits for both isolates in a quantitative way. A genetic map based on AFLP and SSR markers was established and will be used for QTL analysis of powdery mildew resistance.
Original languageEnglish
JournalCommunications in Agricultural and Applied Biological Sciences
Issue number2
Pages (from-to)295-301
Number of pages7
Publication statusPublished - 2007


  • Ascomycota
  • Chromosome Mapping
  • Diploidy
  • Genetic Linkage
  • Genetic Markers
  • Genotype
  • Immunity, Innate
  • Plant Diseases
  • Polymorphism, Genetic
  • Quantitative Trait Loci
  • Rosa


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