Abstract
Wheat straw is the major crop residue in European countries which makes it the most promising material for bioconversion into biofuels. However, cellulose and hemicellulose are protected with lignin, so delignification is an inevitable phase in lignocellulose processing. The organisms predominantly responsible for its degradation are white-rot fungi and among them Trametes species represent promising degraders due to a well-developed ligninolytic enzyme system. Although numerous studies have confirmed that low molecular weight compounds can induce the production and activity of ligninolytic enzymes it is not clear how this reflects on the extent of delignification. The aim of the study was to assess the capacity of p-anisidine and veratryl alcohol to induce the production and activity of Mn-oxidizing peroxidases and laccases, and wheat straw delignification by six Trametes species. Significant inter- and intraspecific variations in activity and features of these enzymes were found, as well as differences in the potential of lignocellulose degradation in the presence or absence of inducers. Differences in the catalytic properties of synthesized enzyme isoforms strongly affected lignin degradation. Apart from enhanced lignin degradation, the addition of p-anisidine could significantly improve the selectivity of wheat straw ligninolysis, which was especially evident for T. hirsuta strains.
Highlights
Wheat straw is the major crop residue in European countries which makes it the most promising material for bioconversion into biofuels
Delignification is an inevitable phase in lignocellulose processing[5]
Our results clearly showed significant inter- and intraspecific variations in the activities and characteristics of Mn-oxidizing peroxidases and laccases, as well as the potential of lignocellulose degradation within the genus Trametes in the presence or absence of inducers. p-anizidine and veratryl alcohol can be considered as efficient inducers of these ligninolytic enzymes in Trametes species
Summary
Wheat straw is the major crop residue in European countries which makes it the most promising material for bioconversion into biofuels. Lignocellulose is a major component of plant biomass, composed of cellulose, hemicellulose and lignin, and represents the most abundant renewable organic source in ecosystems[1,2] Huge amounts of this potentially valuable material are produced in agriculture and forestry but only 3% of annual production is used directly while the rest is considered as waste[3]. The aim of this study was to assess the capacity of p-anisidine and veratryl alcohol to induce the production and activity of Mn-oxidizing peroxidases and laccases, as well as wheat straw delignification by six Trametes species.
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