Monitoring corn stover processing by the fungus Ustilago maydis

Area of Science:

• Biotechnology
• Microbiology
• Sustainable Bioeconomy

Background:

• Sustainable bioeconomy relies on recycling agricultural waste into valuable products.
• Corn stover, a maize byproduct, is an abundant substrate for microbial bioconversion.
• Ustilago maydis is a fungal biocatalyst used for producing compounds from plant biomass.

Purpose of the Study:

• To investigate Ustilago maydis' ability to utilize untreated corn stover as a sole carbon source.
• To develop a monitoring platform for fungal processing of corn stover.
• To explore methods for enhancing lignocellulosic utilization by U. maydis.

Main Methods:

• Cultivation of U. maydis on untreated corn stover in a small-scale bioreactor.
• Online monitoring of fungal growth and metabolic activity.
• Biochemical analysis of corn stover before and after fermentation.
• Co-fermentation with enzyme cocktails and use of engineered fungal strains.

Main Results:

• U. maydis successfully grew on untreated corn stover.
• The fungus primarily consumed soluble sugars, with limited lignocellulose breakdown.
• Performance improvements up to 120% were achieved by enhancing biomass digestibility, using enzyme cocktails, and employing engineered strains.

Conclusions:

• U. maydis can utilize corn stover, but its lignocellulosic capacity needs enhancement for efficient bioproduction.
• Optimized conditions and engineered strains significantly improve the bioconversion of corn stover.
• This study provides a foundation for scaling up sustainable compound production from agricultural waste using U. maydis.