Successive construction of cellulase hyperproducers of Trichoderma using hyperpolyploids

Area of Science:

• Biotechnology
• Microbial Genetics
• Enzyme Engineering

Background:

• Trichoderma reesei is a key fungus for industrial enzyme production.
• Enhancing cellulase production is crucial for biofuel and other biotechnological applications.
• Existing methods for strain improvement can be time-consuming and less efficient.

Purpose of the Study:

• To develop a systematic method for generating cellulase hyperproducers in Trichoderma reesei.
• To utilize polyploidization and haploidization for targeted strain improvement.
• To explore novel approaches for creating superior enzyme-producing microbial strains.

Main Methods:

• Treatment of Trichoderma reesei QM 6a conidia with colchicine to induce autopolyploidy.
• Application of benomyl to haploidize resulting autopolyploids, selecting for fan-shaped sectors.
• Iterative application of colchicine and benomyl treatments on selected hyperproducers.
• Mutagenesis of autopolyploid conidia with ethyl methanesulfonate to obtain additional polyploid hyperproducers.

Main Results:

• Successful induction of autopolyploid nuclei in swollen conidia using colchicine.
• Selection of cellulase hyperproducers through benomyl-induced haploidization and sectoring.
• Systematic enhancement of cellulase production through repeated colchicine and benomyl treatments.
• Generation of novel polyploid cellulase hyperproducers via ethyl methanesulfonate treatment.

Conclusions:

• The combined use of colchicine and benomyl provides an effective strategy for systematically improving cellulase hyperproduction in Trichoderma reesei.
• This method offers a robust pathway for developing advanced microbial strains with enhanced enzymatic capabilities.
• The study demonstrates the potential of induced polyploidy and subsequent haploidization for targeted strain engineering.