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Signaling via the Trichoderma atroviride mitogen-activated protein kinase Tmk 1 differentially affects mycoparasitism

Barbara Reithner1, Rainer Schuhmacher, Norbert Stoppacher

  • 1Vienna University of Technology, Institute for Chemical Engineering, Research Area of Gene Technology and Applied Biochemistry, Working Group Molecular Biochemistry of Fungi, A-1060 Wien, Austria.

Fungal Genetics and Biology : FG & B
|May 19, 2007
PubMed

Insights

The tmk1 gene in Trichoderma atroviride is crucial for fungal growth and mycoparasitic interactions. Deleting this gene enhances antifungal activity and biocontrol efficacy against plant pathogens.

Area of Science:

  • Mycology
  • Plant Pathology
  • Biotechnology

Background:

  • Trichoderma atroviride is a mycoparasitic fungus that combats plant pathogens through enzymes and antibiotics.
  • Mitogen-activated protein kinases (MAPKs) play vital roles in fungal development and interactions.

Purpose of the Study:

  • To investigate the function of the tmk1 gene, encoding a MAPK, in Trichoderma atroviride.
  • To understand its role in fungal growth, mycoparasitic interactions, and biocontrol capabilities.

Main Methods:

  • Gene deletion to create Deltatmk1 mutants.
  • Confrontation assays with plant pathogenic fungi (Rhizoctonia solani, Botrytis cinerea).
  • Analysis of gene transcription (nag1, ech42) and enzyme activity.
  • Assessment of antibiotic production and biocontrol efficacy in bean plants.

Main Results:

  • Deltatmk1 mutants showed altered growth, conidiation, and infection structure formation.
  • Mycoparasitic activity was reduced, but hyphal attachment was unaffected.
  • Elevated chitinase activity and nag1/ech42 transcript levels under specific conditions.
  • Increased production of antifungal compounds (6-pentyl-alpha-pyrone, peptaibols).
  • Enhanced protection of bean plants against R. solani.

Conclusions:

  • The tmk1 gene is essential for regulating Trichoderma atroviride's mycoparasitic interactions and infection structures.
  • Loss of tmk1 function leads to increased antifungal compound production and improved biocontrol performance.

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