Transformation of lignin in surface and buried soils of mountainous landscapes

Ковалева, Н.О.; Kovalev, I. V.

doi:10.1134/s1064229309110106

Cited by 30 publications

(25 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lignin oxidation products such as syringyl and vanillyl aldehydes and ketones are known as effective laccase mediators (Camarero et al, ). These phenols were also found in CuO oxidation products of HAs from soils (Kovaleva & Kovalev, ) and might assist HA degradation by laccase in this work.…”

Section: Discussionsupporting

confidence: 67%

The Role of Ligninolytic Enzymes Laccase and a Versatile Peroxidase of the White‐Rot Fungus Lentinus tigrinus in Biotransformation of Soil Humic Matter: Comparative In Vivo Study

2018

View full text Add to dashboard Cite

Soil organic matter (SOM) turnover by ligninolytic fungi is a large-scale process that controls organic carbon geochemistry in terrestrial ecosystems. However, the role of certain oxidative enzymes (e.g., laccase) in humus degradation remains unclear, as well as the molecular structure and recalcitrance of SOM components. In order to address these questions, the degradation of forest soil humic acid (HA) in the presence of laccase and a versatile peroxidase (VP) has been studied in the liquid culture of Lentinus tigrinus. Contrary to the evolving views on humus structure, we have found that alkali-extractable and acid-insoluble constituents of SOM (HA) contain true macromolecular components, stable in the presence of 0.1% sodium dodecyl sulfate but degradable/resynthesizable by oxidative enzymes acting on covalent linkages. The HA degradation in the presence of laccase (high N medium) occurs at slower initial rate than in the presence of VP (low N medium). However, each of the enzymes caused about 60% color loss and almost complete degradation of HA into smaller molecules (gel-filtration data) within 2 weeks of cultivation. Depolymerization of HA in the culture liquid in the presence of laccase was accompanied by polymerization of degradation products on mycelium. Our results show that (1) humus macromolecules are not stable to oxidative enzymes once desorbed from the mineral phase, (2) laccase of Lentinus tigrinus is comparable by its degradation potential to VP, and (3) interfacial secondary synthesis reactions occur during humus decay in the presence of laccase. Our results highlight the important role of laccases in SOM sequestration in soils.

show abstract

Section: Discussionsupporting

confidence: 67%

The Role of Ligninolytic Enzymes Laccase and a Versatile Peroxidase of the White‐Rot Fungus Lentinus tigrinus in Biotransformation of Soil Humic Matter: Comparative In Vivo Study

2018

View full text Add to dashboard Cite

show abstract

“…As demonstrated by e.g. Kovaleva and Kovalev 37 and Crawford 45 , the ratios of those compounds in lignins are plant species specific. The lignins of flowering plants contain approximately equal amounts of vanillyl and syringyl compounds and little cinnamyl compounds (V:S:C is approximately 49:46:5).…”

mentioning

confidence: 90%

“…The lignins of meadow grasses and herbs can contain 4-to 6-fold more cinnamyl compounds than the lignins of trees. Kovaleva and Kovalev 37 recorded for the aboveground part of subalpine meadows graminaceous plants the V:S:C value of 1:1:6.…”

mentioning

confidence: 96%

“…As seen from the research by Kovaleva and Kovalev 37 and Banach-Szott and Debska 39,40 , phenolic compounds are also present in the fractions of humic and fulvic acids (FAs). In general, humus acids show a similar qualitative composition of lignin oxidation products as compared with soil hydrolysates 37 .…”

mentioning

confidence: 99%

“…Phenolic compounds are a component of lignins and they can be produced as a result microbiological biosynthesis from aliphatic substrates 5,9,[36][37][38] . Changes in the content of lignins and the level of their transformation in decomposing material can be evaluated with the oxidation of plant material and soil samples by using CuO, or applying the method of acid or/and alkaline hydrolysis 36,[39][40][41][42][43][44] .…”

mentioning

confidence: 99%

See 2 more Smart Citations

Transformations of phenolic compounds in meadow soils

Ziolkowska

Dębska

Banach-Szott

2020

Sci Rep

View full text Add to dashboard Cite

The aim of the research has been to determine the role of phenolic compounds in the processes of transformations of organic matter in meadow soils, leading to the formation of humic substances. The research has been performed based on the plant material and soil sampled from Europe’s unique complex of permanent grasslands irrigated continuously for 150 years applying the slope-and-flooding system, the Czerskie Meadows. Phenolic compounds were isolated from the plant material samples (hay, sward and roots) and soils (horizon A, AE and Bsv) and from the fraction of humic and fulvic acids. It was found that the contents of phenolic compounds decrease in the following order: hay > sward > roots > A horizon soil > AE horizon soil > Bsv horizon soil > A horizon fulvic acids > AE horizon fulvic acids > Bsv horizon fulvic acids > A horizon fulvic acids > AE horizon fulvic acids > Bsv horizon fulvic acids. A significantly higher share of cinnamyl than vanillyl and syringyl compounds in the extracts of fulvic acids and slightly higher in the hydrolysates of humic acids confirms the effect of the chemical composition of the plant material undergoing decomposition on the properties of the emerging humic substances.

show abstract