Extracellular enzyme activities during humic acid degradation by the white rot fungi Phanerochaete chrysosporium and Trametes versicolor

Degradation of Humic Acids by the Litter-Decomposing Basidiomycete Collybia dryophila

“…Despite this fact, little is known yet about the microorganisms which decompose and recycle humic matter. Since lignin, the complex aromatic polymer providing strength and rigidity to the cell walls and tissues of vascular plants, is a major parent material in the formation of humic substances (33), several authors studied the decomposition of natural and synthetic HA by white-rot fungi (2,4,6,19,23,38,41), which are the most effective lignin degraders in nature (16). Some of these basidiomycetous fungi which colonize wood (e.g., Phanerochaete chrysosporium, Trametes versicolor, and Nematoloma frowardii) were shown to disintegrate high-molecular-mass HA by forming lower-molecular-mass FA and carbon dioxide (CO 2 ).…”

Organic matter transformation and detoxification in dry olive mill residue by the saprophytic fungus Paecilomyces farinosus

“…Although the dephenolization extents were largely lower than those achieved on DOR by other fungi [22,37] or by microbial communities in compost [33], the fungus under study significantly affected the relative abundances of WSP fractions with molecular weight higher and lower than 30 kDa by largely increasing the former one. These results suggest the occurrence of polymerisation phenomena possibly promoted by phenol-oxidizing enzymes [42]. Among these oxidases, laccase activity was detected in P. farinosus cultures on DOR (present study).…”

“…In fact, the relative amounts of C HA and C FA in solid-state cultures of fungi have been shown to be variably affected by the balance between lignin depolymerisation/ polymerisation reactions [41]. In addition, humic acids have been shown to be efficiently depolymerised by fungi with subsequent effects on C HA /C FA ratios [42] and the taxonomically related species P. inflatus was found to degrade and mineralise natural humic acids in a compost environment [10]. In the present study, HR was found to be increased by about 65% with respect to the corresponding abiotic control.…”

Kraft Lignin Degradation by Autochtonous Streptomyces Strains Isolated From a Tropical Lagoon Ecosystem

“…Currently, much attention is drawn to the biological methods because it appears to be a promising alternative due to their environmental friendliness. Despite its apparent resistance to degradation, microorganisms including fungi, bacteria and However, lignin degradation by microorganisms is well studied in the domain of aerobic fungi (Dehorter and Blondeau, 1992;Achi, 1994). Among them, the white rot fungi have received extensive attention due to the presence of efficient extracellular ligninolytic enzyme activities (Churphal et al, 2005).…”