Trichoderma reesei Isolated From Austrian Soil With High Potential for Biotechnological Application

Area of Science:

• Mycology and Biotechnology
• Industrial Microbiology

Background:

• The fungus Trichoderma reesei is crucial for biotechnology, biocontrol, and protein production.
• Sexual reproduction of T. reesei has been limited to tropical isolates, hindering research and strain development.
• Previous knowledge indicated T. reesei was exclusively found in tropical regions.

Purpose of the Study:

• To investigate the occurrence and characteristics of Trichoderma strains in Austrian soils.
• To assess the biotechnological potential of newly discovered European T. reesei isolates.
• To explore genetic variations and reproductive capabilities of these novel strains.

Main Methods:

• Isolation and identification of Trichoderma strains from Austrian soils.
• Molecular identification using tef1 and rpb2 sequencing, phylogenetic analysis, and UP-PCR.
• Mating tests with reference strains and analysis of secreted enzyme levels (cellulase, xylanase).

Main Results:

• Twelve T. reesei strains were isolated from Austrian soils, marking the first known occurrence in Europe.
• These European strains are genetically distinct from tropical isolates and readily mate with reference strains.
• Isolates exhibited up to six-fold higher cellulase and xylanase production compared to the QM6a wildtype.

Conclusions:

• The discovery of sexually fertile European T. reesei strains opens avenues for non-GMO strain improvement.
• These isolates possess significant potential for enhanced enzyme production for industrial applications, including bioethanol production.
• Further research is needed to understand the regulators controlling sporulation response to injury, as it appears independent of Nox1 and NoxR.