The natural bacterial communities of the soil–plant system are relevant in the process of suppressing diseases caused by soilborne plant pathogens. However, little is known regarding the structure of these communities in soils cultivated with brassica vegetables and their relationship with clubroot severity, a disease caused by Plasmodiophora brassicae. In the present study, the composition of bacterial communities in soils cultivated with cauliflower with distinct levels of disease severity was compared. The bacterial composition in soils with lower and higher clubroot severity differs in phylum and genera levels. Soils associated with plants with lower disease severity showed predominance of Kaistobacter, Flavisolibacter, Sphingobacterium, Koribacter, Nitrospira, Bradyrhizobium and Bacillus. Our study reinforces the importance of management strategies that promote improving the physical–chemical characteristics of soil, which are essential to modulate bacterial populations correlated with plant disease suppression.

中文翻译：

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根茎严重程度较低和较高的芸苔栽培土壤中的细菌组成

土壤-植物系统中的天然细菌群落与抑制土壤中的植物病原体引起的疾病有关。然而，关于芸苔属蔬菜栽培的土壤中这些群落的结构及其与根瘤病严重程度的关系知之甚少，该病是由芸苔疟原虫引起的。在本研究中，比较了用菜花栽培的土壤中病害严重程度不同的细菌群落组成。根茎严重程度较低和较高的土壤中的细菌组成在门和属水平上都不同。与病害严重程度较低的植物相关的土壤占优势的是Kaistobacter，Flavisolibacter，Sphingobacterium，Koribacter，硝化，根瘤菌和芽孢杆菌。我们的研究强调了促进改善土壤理化特性的管理策略的重要性，这对于调节与植物病害抑制相关的细菌种群至关重要。