Abstract
Clubroot disease is devastating to Brassica crop production when susceptible cultivars are planted in infected fields. European turnips are the most resistant sources and their resistance genes have been introduced into other crops such oilseed rape (Brassica napus L.), Chinese cabbage and other Brassica vegetables. The European clubroot differential (ECD) set contains four turnip accessions (ECD1–4). These ECD turnips exhibited high levels of resistance to clubroot when they were tested under controlled environmental conditions with Canadian field isolates. Gene mapping of the clubroot resistance genes in ECD1–4 were performed and three independent dominant resistance loci were identified. Two resistance loci were mapped on chromosome A03 and the third on chromosome A08. Each ECD turnip accession contained two of these three resistance loci. Some resistance loci were homozygous in ECD accessions while others showed heterozygosity based on the segregation of clubroot resistance in 20 BC1 families derived from ECD1 to 4. Molecular markers were developed linked to each clubroot resistance loci for the resistance gene introgression in different germplasm.
Highlights
Clubroot caused by an obligate biotrophic parasite, Plasmodiophora brassicae (Woronin), is recently one of the most economically important diseases of canola/rapeseed and other Brassica vegetable crops in the world
Four turnips, ECD1–4 were resistant while one Chinese cabbage ECD5 was susceptible (Table 1)
The European clubroot differential (ECD) set is commonly used to investigate the change of clubroot pathogen isolates in the research community of Brassica species
Summary
Clubroot caused by an obligate biotrophic parasite, Plasmodiophora brassicae (Woronin), is recently one of the most economically important diseases of canola/rapeseed and other Brassica vegetable crops in the world. This disease was recorded in Japan in 1890s (Ikegami et al, 1981), and it is known to occur in Brassica crops in more than 60 countries. 60–90% yield losses were reported when susceptible canola/rapeseed cultivars were planted in 1998–2000 (Dixon, 2009) This suggests that cultivation of clubroot resistant canola/rapeseed cultivars is the most effective and sustainable management method for clubroot disease
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