Zamani-Noor Nazanin, Wallenhammar Ann-Charlotte, Kaczmarek Joanna, Patar Usha Rani, Zouhar Miloslav, Manasova Marie, Jędryczka Małgorzata
Julius Kühn-Institute (JKI), Institute for Plant Protection in Field Crops and Grassland, D-38104 Braunschweig, Germany.
Rural Economy and Agricultural Society, HS Konsult AB, Gamla vägen 5G, SE-702 22 Örebro, Sweden.
Pathogens. 2022 Nov 29;11(12):1440. doi: 10.3390/pathogens11121440.
Clubroot, caused by , is a crucial oilseed rape disease worldwide. Information on the virulence of populations is essential to apply disease control with proper clubroot-resistant cultivars. In 2016-2020, 84 isolates of were collected in the Czech Republic (CZ), Germany (DE), Poland (PL), and Sweden (SW). Pathotypes were designated using 17 Brassica hosts, including the European Clubroot Differentials (ECD), Somé set, and clubroot-resistant oilseed rape cv. Mendel. According to the ECD set, virulence analyses differentiated the isolates into 42 pathotypes. The most common pathotypes were 16/31/31 (in DE, PL, and SW) and 16/06/12 (in CZ, DE, and PL). Six pathotypes were found according to the Somé set, including 1-4 pathotypes per country. P1 was most prevalent in DE, PL, and SW, while P3 was abundant in CZ, DE, and PL. The current study provides clear evidence for a shift towards increased virulence in populations compared to previous studies. Several isolates overcame the resistance of cv. Mendel and of genotypes ECD 01 to ECD 04. Considering all investigated samples, significant negative correlations were found between clubroot incidence and the frequency of oilseed rape in crop rotation, as for clubroot incidence and soil pH.
根肿病由[病原体名称缺失]引起，是全球范围内油菜的一种关键病害。了解[病原体名称缺失]种群的毒力信息对于采用合适的抗根肿病品种进行病害防治至关重要。2016年至2020年期间，在捷克共和国（CZ）、德国（DE）、波兰（PL）和瑞典（SW）收集了84株[病原体名称缺失]分离株。使用17种芸苔属寄主来确定致病型，包括欧洲根肿病鉴别品种（ECD）、索梅组以及抗根肿病油菜品种孟德尔。根据ECD品种组，毒力分析将分离株分为42种致病型。最常见的致病型是16/31/31（在德国、波兰和瑞典）和16/06/12（在捷克共和国、德国和波兰）。根据索梅组发现了6种致病型，每个国家有1至4种致病型。P1在德国、波兰和瑞典最为普遍，而P3在捷克共和国、德国和波兰较为常见。与之前的研究相比，当前研究为[病原体名称缺失]种群毒力增加的转变提供了明确证据。一些分离株克服了孟德尔品种以及ECD 01至ECD 04基因型的抗性。考虑到所有调查样本，根肿病发病率与轮作中油菜频率之间以及根肿病发病率与土壤pH值之间均存在显著负相关。
