Wallenhammar Ann-Charlotte, Edin Eva, Jonsson Anders
Rural Economy and Agricultural Society, HS Konsult AB, Gamla vägen 5G, SE-702 22 Örebro, Sweden.
Rural Economy and Agricultural Society, HS Konsult AB, Brunnby Gård 1, SE-725 97 Västerås, Sweden.
Pathogens. 2024 Aug 29;13(9):739. doi: 10.3390/pathogens13090739.
Oilseed radish (OR; var. ) is grown as a cover crop and develops a unique taproot, absorbing nitrogen left by the previous crop. The aim of this project was to investigate the resistance of OR cultivars (cvs.) to , the causal agent of clubroot disease. Twelve market cvs. were compared with cvs. of clubroot-resistant (CR) winter oilseed rape (OSR; ) and other selected species of the Brassicaceae family. The study was performed as a replicated bioassay in a growth chamber using a specially composed mixture of field soils holding the natural inoculum of . The results show that the OR cultivars were infected, which implies that OR multiplies the pathogen. The susceptibility of the OR cultivars was not significantly different from that of the CR OSR cultivars Alister and Archimedes, but it was significantly different from that of the OSR cv. Mendel. The disease severity index (DSI) for OR cultivars ranged from 2.3 to 9.3, and disease incidence was 3-17%. The best performance was shown by black radish ( var. ) with a DSI of 0.3. For sustainable brassica crop production, we suggest avoiding OR as a cover crop in crop rotations, including OSR or other brassica crops, since there is a risk of increasing inoculum in the soil.
油菜萝卜（OR；变种 ）作为覆盖作物种植，会形成独特的主根，吸收前茬作物残留的氮。本项目的目的是研究OR品种对根肿病病原菌 的抗性。将12个市售品种与抗根肿病（CR）的冬油菜（OSR； ）品种以及十字花科的其他选定物种进行比较。该研究在生长室中作为重复生物测定进行，使用含有 自然接种体的特殊配制的田间土壤混合物。结果表明，OR品种受到了感染，这意味着OR会使病原菌繁殖。OR品种的易感性与CR冬油菜品种阿利斯特和阿基米德的易感性没有显著差异，但与冬油菜品种孟德尔的易感性有显著差异。OR品种的病情严重指数（DSI）范围为2.3至9.3，发病率为3 - 17%。黑萝卜（变种 ）表现最佳，DSI为0.3。为了实现可持续的芸苔属作物生产，我们建议在包括冬油菜或其他芸苔属作物的轮作中避免将OR用作覆盖作物，因为存在土壤中接种体增加的风险。
