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<p>Fusarium head blight (FHB), caused by <i>Fusarium</i> spp., threatens global wheat production and food security through yield losses and mycotoxin contamination. In this study, <i>Paenibacillus polymyxa</i> A818, isolated from <i>Polygonatum sibiricum</i> rhizosphere soil, exhibited strong antifungal activity against <i>Fusarium graminearum</i> (55% mycelial inhibition). A818 treatment significantly reduced disease symptoms in wheat coleoptiles and spikes and decreased deoxynivalenol (DON) accumulation in grains. Molecular analysis showed that A818 downregulated key trichothecene biosynthesis genes (<i>TRI1</i>, <i>TRI4</i>, <i>TRI5</i>, <i>TRI8</i>), and transcriptomics suggested its mode of action involves impairing eukaryotic ribosome biogenesis and amino acid biosynthesis pathways. These findings highlight the potential of <i>P. polymyxa</i> A818 as a biocontrol agent against FHB.</p>

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Biocontrol characteristics and management potential of Paenibacillus polymyxa A818 against Fusarium head blight in wheat

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Huijuan Peng,
  • Yihua Liao,
  • Tian Yang,
  • Chao Liu,
  • Xin Liu,
  • Dongfang Ma,
  • Chengcheng Li,
  • Yujun Xing

摘要

Fusarium head blight (FHB), caused by Fusarium spp., threatens global wheat production and food security through yield losses and mycotoxin contamination. In this study, Paenibacillus polymyxa A818, isolated from Polygonatum sibiricum rhizosphere soil, exhibited strong antifungal activity against Fusarium graminearum (55% mycelial inhibition). A818 treatment significantly reduced disease symptoms in wheat coleoptiles and spikes and decreased deoxynivalenol (DON) accumulation in grains. Molecular analysis showed that A818 downregulated key trichothecene biosynthesis genes (TRI1, TRI4, TRI5, TRI8), and transcriptomics suggested its mode of action involves impairing eukaryotic ribosome biogenesis and amino acid biosynthesis pathways. These findings highlight the potential of P. polymyxa A818 as a biocontrol agent against FHB.