Bacterial composition in brassica‐cultivated soils with low and high severity of clubroot

Abstract

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.

Comparison of the effects of three fungicides on clubroot disease of tumorous stem mustard and soil bacterial community

“…Therefore, the abundance of Proteobacteria may be stimulated by pathogens in the soil, or that these bacteria are less sensitive to fungicides. That Acidobacteria were positively correlated with soil samples experiencing lower clubroot severity is consistent with the results of Saraiva et al (2020).…”

“…Nitrospira and Bradyrhizobium, as shown by Saraiva et al (2020) to be more abundant in the soils containing plants with lower clubroot severity, were significantly negatively correlated with DI in our study (Additional file 4). Similar to Lebreton et al (2019), the rhizosphere soil bacterial communities were disrupted to a greater degree by the invasion of P. brassicae during the latter part of the incubation (6 W) (Figs.…”

“…The interaction of soil properties, soil microbial diversity, and clubroot development is complex and dynamic, but no cause-and-effect relationship between bacterial composition and clubroot severity has been found (Bhering et al, 2020). Meanwhile, other studies have summarized the characteristics of bacterial composition in soils with severe clubroot disease (Lebreton et al, 2019;Saraiva et al, 2020). In our study, we found that Fig.…”

“…Soil bacteria, as an important part of the soil microbial community, are of great significance in maintaining soil structure and function, and microbial diversity is positively correlated with the suppression of disease (Saraiva et al, 2020). The development of clubroot disease is determined by the soil environment, including its properties and biological Fig.…”

Repeated Application of Rice Straw Stabilizes Soil Bacterial Community Composition and Inhibits Clubroot Disease

“…This special period may be the key period of pathogen infection, causing differences in the microbe between the early and late stages. Soil-borne plant pathogens can be suppressed by microbe or antagonistic competition, and the predominance of some bacteria may reduce the infection process and severity of clubroot [52]. Sustainable agriculture has to balance soil microorganisms with the control soil-borne diseases, and organic amendment has a beneficial influence [53].…”