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<p><i>Trichoderma harzianum</i> is a filamentous ascomycete frequently applied as biocontrol agent in agriculture. While mycoparasitism and antagonism of <i>Trichoderma</i> spp. against fungal pathogens are well known, early fungal responses to the presence of a plant await broader investigation. Analyzing early stages of plant-fungus communication we show that <i>T. harzianum</i> B97 chemotropically responds to a plant extract and that both plant and fungus alter secondary metabolite secretion upon recognition. We developed a strategy for omics-analysis simulating conditions of early plant recognition eliciting a chemotropic response in the fungus and found 102 genes to be differentially regulated, including nitrate and nitrite reductases. Additionally, the previously uncharacterized <Emphasis Type="ItalicUnderline">P</Emphasis>lant <Emphasis Type="ItalicUnderline">C</Emphasis>ommunication <Emphasis Type="ItalicUnderline">A</Emphasis>ssociated (PCA) gene cluster was strongly induced upon recognition of the plant, comprises a palindromic DNA motif and was essential for plant colonization. The PCA-cluster is only present in the Harzianum clade of <i>Trichoderma</i> and closely related to a homologous cluster in <i>Metarhizium</i> spp. Horizontal gene transfer (HGT) was detected for PCA-cluster genes by plants, while the cluster in <i>T. harzianum</i> is likely under balancing or positive selection. Hence, the PCA-cluster mediates early fungus-plant chemical communication and may be responsible for the high potential of <i>T. harzianum</i> and closely related species for biocontrol applications.</p>

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Plant recognition by Trichoderma Harzianum elicits upregulation of a novel secondary metabolite cluster required for colonization

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月20日

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  • Miriam Schalamun,
  • Guofen Li,
  • Wolfgang Hinterdobler,
  • Dominik K. Großkinsky,
  • Stéphane Compant,
  • Assia Dreux-Zigha,
  • Jennifer Gerke,
  • Russell Cox,
  • Monika Schmoll

摘要

Trichoderma harzianum is a filamentous ascomycete frequently applied as biocontrol agent in agriculture. While mycoparasitism and antagonism of Trichoderma spp. against fungal pathogens are well known, early fungal responses to the presence of a plant await broader investigation. Analyzing early stages of plant-fungus communication we show that T. harzianum B97 chemotropically responds to a plant extract and that both plant and fungus alter secondary metabolite secretion upon recognition. We developed a strategy for omics-analysis simulating conditions of early plant recognition eliciting a chemotropic response in the fungus and found 102 genes to be differentially regulated, including nitrate and nitrite reductases. Additionally, the previously uncharacterized Plant Communication Associated (PCA) gene cluster was strongly induced upon recognition of the plant, comprises a palindromic DNA motif and was essential for plant colonization. The PCA-cluster is only present in the Harzianum clade of Trichoderma and closely related to a homologous cluster in Metarhizium spp. Horizontal gene transfer (HGT) was detected for PCA-cluster genes by plants, while the cluster in T. harzianum is likely under balancing or positive selection. Hence, the PCA-cluster mediates early fungus-plant chemical communication and may be responsible for the high potential of T. harzianum and closely related species for biocontrol applications.