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Pseudomonas frederiksbergensis FC-17 shows prominent biological control for potato wilt disease caused by Ralstonia solanacearum. It remains unknown whether the biocontrol strain can effectively colonize rhizosphere soil and how it affects the bacterial community. Therefore, we used qPCR to track the abundance changes of FC-17 in the potato rhizosphere within 30 days after pathogen inoculation. The findings showed that applying bio-organic fertilizer, produced by secondary solid fermentation of organic fertilizer and FC-17, effectively improved disease control but did not enhance FC-17 colonization. 16S rRNA gene amplicon sequencing indicated that disease suppression was primarily attributed to the alterations in bacterial community composition, rather than the competitiveness of the inoculated FC-17 strain. Under pathogen pressure, bio-organic fertilizer treatment enriched specific bacterial genera, including Sphingomonas, Sphingobium, Lysobacter, and Isoptericola. Among these, Lysobacter and Sphingomonas were negatively correlated with the disease index, suggesting their potential role in suppressing potato bacterial wilt. This study elucidates a microbiome-mediated biocontrol mechanism, highlighting that optimizing the resident microbial community is a crucial strategy for sustainable disease management. Our results provide a theoretical foundation for combining P. frederiksbergensis with organic fertilizer to control potato bacterial wilt.
Li et al. (Fri,) studied this question.