Resistance to Pyrenopeziza brassicae (light leaf spot) in Brassica napus

Emily F. Boys, Susan Roques, Jon S. West, C. Peter Werner, Graham J. King, Paul S. Dyer, David Hughes, Bruce D.L. Fitt

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Light leaf spot (caused by the hemibiotrophic Pyrenopeziza brassicae) is one of the most important diseases of winter oilseed rape (Brassica napus) in northern Europe, including the UK. In controlled environment and field experiments to study sources of genetic resistance against P. brassicae, R gene-mediated resistance introduced into B. napus slowed growth of P. brassicae, prevented asexual sporulation on living tissue, but did not prevent sexual
sporulation on senescent tissue. The resistance did not operate in the manner typical of R gene-mediated resistance against hemibiotrophs. P. brassicae infected the resistant lines but did not elicit an immediate hypersensitive response preventing further fungal growth.
Instead, it grew sparsely as sub-cuticular hyphae within green leaves, until a “dark flecking” phenotype associated with collapse of epidermal cells was observed approximately 10 days post inoculation. This resistance may be more durable than that of a typical R gene because it reduces secondary infection by splash-dispersed conidia but does not apply selection by preventing the pathogen from completing its life cycle
Original languageEnglish
Title of host publicationProcs of the 13th International Rapeseed Congress
Number of pages4
ISBN (Electronic)978-87065-33-4 (CD)
Publication statusPublished - 2011
Event13th Int Rapeseed Congress - Prague, Czech Republic
Duration: 5 Jun 20118 Jun 2011


Conference13th Int Rapeseed Congress
Country/TerritoryCzech Republic


  • Brassica napus (oilseed rape)
  • doubled haploid mapping population
  • durable resistance
  • hemibiotroph
  • Pyrenopeziza brassicae (light leaf spot)


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