Abstract
Although bacterial communities play important roles in the suppression of pathogenic diseases and crop production, little is known about the bacterial communities associated with bacterial wilt. Based on 16S rRNA gene sequencing, statistical analyses of microbial communities in disease-suppressive and disease-conducive soils from three districts during the vegetation period of tobacco showed that Proteobacteria was the dominant phylum, followed by Acidobacteria. Only samples from September were significantly correlated to disease factors. Fifteen indicators from taxa found in September (1 class, 2 orders, 3 families and 9 genera) were identified in the screen as being associated with disease suppression, and 10 of those were verified for potential disease suppression in March. Kaistobacter appeared to be the genus with the most potential for disease suppression. Elucidating microbially mediated natural disease suppression is fundamental to understanding microecosystem responses to sustainable farming and provides a possible approach for modeling disease-suppressive indicators. Here, using cluster analysis, MRPP testing, LEfSe and specific filters for a Venn diagram, we provide insight into identifying possible indicators of disease suppression of tobacco bacterial wilt.
Highlights
Bacterial communities play important roles in the suppression of pathogenic diseases and crop production, little is known about the bacterial communities associated with bacterial wilt
As societal concerns regarding agricultural sustainability increase, soil is considered a living system that is notably affected by microbial communities[1]
Among the distribution of the predominant bacterial phyla, Proteobacteria was the dominant one, followed by Acidobacteria (Fig. 1A,B). Both of their relative abundances experienced a reduction from March to September, especially Acidobacteria, which decreased by almost 8%, whereas Bacteroidetes increased by 5.09%, Cyanobacteria by 2.24%, Firmicutes by 1.59%, Others and Unclassified by 1.53% and Actinobacteria by 0.24% (Fig. 1A,B)
Summary
Bacterial communities play important roles in the suppression of pathogenic diseases and crop production, little is known about the bacterial communities associated with bacterial wilt. It is well known that the interactions among soil microorganisms can induce the homeostasis of soil microbial communities and suppress soil-borne pathogens. The causal bacterium, Ralstonia solanacearum, is a β-proteobacterium and is pathogenic to more than 200 plant species belonging to over 50 different botanical families[15]. This vascular pathogen is noted for its lethality, complex www.nature.com/scientificreports/. The manipulation of natural microbial communities is considered one of the most promising strategies in increasing soil health for sustainable and integrated disease management[18]
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