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<p>Plant microbiota contribute to disease suppression, but biocontrol mechanisms against potato common scab (PCS) and microbial community interactions remain unclear. We isolated <i>Bacillus subtilis</i> XT11 from PCS-infected soil, showing strong antagonism against <i>Streptomyces bottropensis</i> AMCC400023. Field trials showed that XT11 reduced PCS severity and pathogen abundance. Soil microbial networks became more complexly interconnected post-treatment, with XT11 abundance positively linked to beneficial microbes and negatively to the pathogen, implying cooperative biocontrol. Genomic analysis of strain XT11 revealed candidate genes predicted to be associated with biocontrol-related functions, including genes involved in antimicrobial compound biosynthesis (e.g., surfactin), biofilm formation (e.g., the <i>eps</i> operon), and motility-related processes (e.g., the <i>fli</i> operon). These predicted genomic features indicate a broad metabolic potential and may contribute to the ecological adaptability of strain XT11. Our study reveals soil microbiota’s critical role in PCS control, advancing sustainable strategies for potato disease management.</p>

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Inhibition of potato common scab by Bacillus subtilis XT11 and its reshaping of the microbial community in potato geocaulosphere soil

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Ning Liu,
  • Minghao Lv,
  • Yongdong Wang,
  • Huimin Ma,
  • Wei Fan,
  • Junjie Ma,
  • Jiguang Wang,
  • Yanping Gao,
  • Jinbiao Ma,
  • Bo Zhou,
  • Wenchong Shi,
  • Zheng Gao

摘要

Plant microbiota contribute to disease suppression, but biocontrol mechanisms against potato common scab (PCS) and microbial community interactions remain unclear. We isolated Bacillus subtilis XT11 from PCS-infected soil, showing strong antagonism against Streptomyces bottropensis AMCC400023. Field trials showed that XT11 reduced PCS severity and pathogen abundance. Soil microbial networks became more complexly interconnected post-treatment, with XT11 abundance positively linked to beneficial microbes and negatively to the pathogen, implying cooperative biocontrol. Genomic analysis of strain XT11 revealed candidate genes predicted to be associated with biocontrol-related functions, including genes involved in antimicrobial compound biosynthesis (e.g., surfactin), biofilm formation (e.g., the eps operon), and motility-related processes (e.g., the fli operon). These predicted genomic features indicate a broad metabolic potential and may contribute to the ecological adaptability of strain XT11. Our study reveals soil microbiota’s critical role in PCS control, advancing sustainable strategies for potato disease management.