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Boosting lignocellulosic bioethanol production: fermentation of corn stalk using a lignin-reduced brown midrib 2 maize mutant
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Boosting lignocellulosic bioethanol production: fermentation of corn stalk using a lignin-reduced brown midrib 2 maize mutant
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Journal Article
Boosting lignocellulosic bioethanol production: fermentation of corn stalk using a lignin-reduced brown midrib 2 maize mutant
2025
Overview
Background
The recalcitrance of lignin is a major bottleneck in the efficient conversion of lignocellulosic biomass to bioethanol. Genetic reduction of lignin content represents a key strategy to overcome this barrier. This study focuses on characterizing the
brown midrib2
(
bm2
) maize mutant to assess its potential for improving bioethanol production.
Results
Using a near-isogenic line (BC
4
F
5
) harboring the
bm2
mutation, an 8.01% reduction in acid-insoluble lignin content in stalks was observed, with no significant change in cellulose or hemicellulose. This lignin reduction led to a 25.17% increase in glucose release upon sulfuric acid pretreatment. Most importantly, the
bm2
mutant showed significantly higher lignocellulosic bioethanol yields: 3.05 g/L Ethanol 1 from the pretreatment hydrolysate (fermentation via
Pichia stipites
) and 25.88 g/L Ethanol 2 from the cellulose residue (fermentation via
Saccharomyces cerevisiae
), corresponding to 59.07% and 38.58% increases over the wild-type control, respectively.
Conclusions
Our results provide direct evidence that the
bm2
mutation enhances lignocellulosic ethanol production by reducing lignin content and improving saccharification efficiency. This work underscores the value of
bm2
in breeding specialized corn varieties for sustainable biofuel feedstock.
Publisher
BioMed Central,BioMed Central Ltd,Nature Publishing Group,BMC
Subject
/ Biofuels
/ Biomass
/ Chemistry and Materials Science
/ Corn
/ Dextrose
/ Environmental Engineering/Biotechnology
/ Enzymes
/ Ethanol
/ Genes
/ Glucose
/ Lignin
/ Mutants
/ Mutation
/ Plant Breeding/Biotechnology
/ Recent trends in the utilization of biomass technologies for the production of biofuels
