University of Hertfordshire

  • Coretta Kloeppel
  • Birger Koopmann
  • Mark Winter
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Original languageEnglish
Publication statusPublished - 25 Sep 2013
EventAHDB Crop Research Conference- Knowing your enemy - the future of crop protection - Queen Elizabeth II Conference Centre, London, United Kingdom
Duration: 25 Sep 201325 Sep 2013

Conference

ConferenceAHDB Crop Research Conference- Knowing your enemy - the future of crop protection
CountryUnited Kingdom
CityLondon
Period25/09/1325/09/13

Abstract

Stem canker caused by Leptosphaeria maculans is an important disease in oilseed rape (Brassica napus L.) and causes significant yield losses. The cultivation of resistant cultivars is a reliable tool for protecting the crop against pathogen damage. In controlled environment experiments, the efficacy
of major resistance genes against L. maculans was tested under varying temperatures for cotyledons and stems. Therefore, the resistant cultivars Caiman with Rlm7 resistance and Uluru with LepR3 resistance, as well as Lirabon as susceptible control, were used. For each resistant cultivar an avirulent and a virulent L. maculans isolate were selected. Cotyledon resistance was tested with a
spore suspension, whereas adult resistance was tested at the stem base by inoculation with a mycelium plug. The plant‐pathogen interactions were examined at different temperature regimes.
Incompatible interactions found on cotyledons of Uluru turned to be compatible, whereas only an increase of L. maculans DNA was found for cotyledons of Caiman at higher temperatures (≥27°C).
Major gene resistance could actively reduce disease severity in stem tissue. Especially, Caiman was strongly dependent on its Rlm7 resistance gene, whereas resistance of Uluru relied more on quantitative resistance. High temperature treatment did not change incompatibility into compatibility at stem bases.

ID: 2571697