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<p><i>Fusarium</i> species are major contributors to Fusarium head blight (FHB) and mycotoxin contamination in cereal production. To characterize microbial co-occurrence associated with toxin accumulation in oats, the <i>Fusarium</i>, fungal, and bacterial communities of 51 Finnish oat grain samples were analyzed using a multi-marker metabarcoding approach targeting <i>Fusarium</i> translation elongation factor 1‑alpha (EF1α), fungal ITS2, and bacterial 16&#xa0;S regions. Microbial profiles were compared between grains with high and low deoxynivalenol (DON) concentrations. High‑DON samples were dominated by <i>F. graminearum</i>, whereas <i>F. langsethiae</i> prevailed in low‑DON grains. Bacterial diversity was higher in high‑DON samples, while fungal diversity remained similar across groups. Several bacterial genera, including <i>Pseudomonas</i>, <i>Paenibacillus</i>, <i>Massilia</i>, and <i>Curtobacterium</i>, exhibited negative correlations with <i>Fusarium</i> species, indicating competition in the same niche, whereas <i>Duganella</i> and <i>Xylophilus</i> showed positive association with <i>Fusarium</i> abundance. <i>Microdochium</i> consistently co-occurred with <i>Fusarium</i>. Results show differences in microbial communities associated with mycotoxin levels and <i>Fusarium</i> community composition, identifying taxa that may influence FHB or indicate mycotoxin risk.</p> Graphical Abstract <p></p>

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Fusarium Community Composition and Co-Occurrence with Other Fungi and Bacteria in Finnish Oat Crop

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月3日

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  • Elina Sohlberg,
  • Arja Laitila,
  • Sari Rämö,
  • Tuija Sarlin

摘要

Fusarium species are major contributors to Fusarium head blight (FHB) and mycotoxin contamination in cereal production. To characterize microbial co-occurrence associated with toxin accumulation in oats, the Fusarium, fungal, and bacterial communities of 51 Finnish oat grain samples were analyzed using a multi-marker metabarcoding approach targeting Fusarium translation elongation factor 1‑alpha (EF1α), fungal ITS2, and bacterial 16 S regions. Microbial profiles were compared between grains with high and low deoxynivalenol (DON) concentrations. High‑DON samples were dominated by F. graminearum, whereas F. langsethiae prevailed in low‑DON grains. Bacterial diversity was higher in high‑DON samples, while fungal diversity remained similar across groups. Several bacterial genera, including Pseudomonas, Paenibacillus, Massilia, and Curtobacterium, exhibited negative correlations with Fusarium species, indicating competition in the same niche, whereas Duganella and Xylophilus showed positive association with Fusarium abundance. Microdochium consistently co-occurred with Fusarium. Results show differences in microbial communities associated with mycotoxin levels and Fusarium community composition, identifying taxa that may influence FHB or indicate mycotoxin risk.

Graphical Abstract