Impact of white-rot fungi on numbers and community composition of bacteria colonizing beech wood from forest soil

The aim of this study was to determine the destructive capabilities of the two white rot fungi Pleurotus cornucopiae (Pc) and P. eryngii (Pe) compared with the standard fungus Trametes versicolor (Tv) on beech wood samples after 60 days of incubation. Understanding of the white rot decay is important as it is necessary for the development of effective solutions for wood protection. Measurements of mass loss, chemical, mechanical properties and light microscopical investigations were conducted prior to and after incubation. Mass loss of samples was found to be 9-22 % depending on fungi species. Impact bending strength is not as sensitive as presumed in classical literature. Light microscopy analysis revealed that decay patterns were similar for both fungi. Wood cell wall thinning, fungal colonization hyphae were also the same for both fungi. Results indicated considerable wood attack by both Pleurotus species, Pc being more destructive than Pe.

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Comparison between degradation capabilities of the white rot fungi Pleurotus ostreatus and Trametes versicolor in beech wood

International Biodeterioration & Biodegradation ◽

10.1016/j.ibiod.2015.03.033 ◽

2015 ◽

Vol 104 ◽

pp. 231-237 ◽

Cited By ~ 31

Author(s):

Ehsan Bari ◽

Nouredin Nazarnezhad ◽

Seyed Mahmoud Kazemi ◽

Mohammad Ali Tajick Ghanbary ◽

Behbood Mohebby ◽

...

Keyword(s):

Pleurotus Ostreatus ◽

Trametes Versicolor ◽

Beech Wood ◽

White Rot Fungi ◽

White Rot

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Mechanical properties and chemical composition of beech wood exposed for 30 and 120 days to white-rot fungi

Holzforschung ◽

10.1515/hf-2014-0057 ◽

2015 ◽

Vol 69 (5) ◽

pp. 587-593 ◽

Cited By ~ 11

Author(s):

Ehsan Bari ◽

Hamid Reza Taghiyari ◽

Behbood Mohebby ◽

Carol A. Clausen ◽

Olaf Schmidt ◽

...

Keyword(s):

Mechanical Properties ◽

Chemical Composition ◽

Beech Wood ◽

White Rot Fungi ◽

White Rot ◽

Chemical Components ◽

Fungal Decay ◽

Oriental Beech ◽

Impact Bending ◽

Decay Tests

Abstract The effects of exposing specimens of Oriental beech [Fagus sylvatica subsp. orientalis (Lipsky) Greuter and Burdet] to the white-rot fungi Pleurotus ostreatus (Jacq.: Fr.) Kummer and Trametes versicolor (L.: Fr.) Pilát strain 325 have been studied concerning the mechanical properties and chemical composition in terms of carbohydrates, cellulose, and lignin. Biological decay tests were carried out in accordance with the EN 113 standard specifications for 30 and 120 days. P. ostreatus had nearly the same deteriorating effects on the mechanical properties and chemical composition as that caused by T. versicolor. High and significant correlations were found between some mechanical properties with chemical components; for instance, the correlation coefficient (R2) between impact bending and carbohydrate content was about 0.96. The changes of components influence the various mechanical properties to a different degree. Incipient fungal decay caused severe changes for impact bending and carbohydrate loss. Several other properties declined at 120-day exposure time, such as the hardness, compression strength parallel to grain, and cellulose and lignin losses.

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Monitoring the cell wall characteristics of degraded beech wood by white-rot fungi: Anatomical, chemical, and photochemical study

Maderas Ciencia y tecnología ◽

10.4067/s0718-221x2018005001401 ◽

2018 ◽

pp. 0-0 ◽

Cited By ~ 2

Author(s):

Ehsan Bari ◽

Behbood Mohebby ◽

Hamid Reza Naji ◽

Reza Oladi ◽

Nural Yilgor ◽

...

Keyword(s):

Cell Wall ◽

Beech Wood ◽

White Rot Fungi ◽

White Rot

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Characterizing Fungal Decay of Beech Wood: Potential for Biotechnological Applications

Microorganisms ◽

10.3390/microorganisms9020247 ◽

2021 ◽

Vol 9 (2) ◽

pp. 247

Author(s):

Ehsan Bari ◽

Katie Ohno ◽

Nural Yilgor ◽

Adya P. Singh ◽

Jeffrey J. Morrell ◽

...

Keyword(s):

Lignin Degradation ◽

Beech Wood ◽

White Rot Fungi ◽

White Rot ◽

Aromatic Rings ◽

Northern Iran ◽

Decay Fungi ◽

Pleurotus Species ◽

Decay Test ◽

Cell Wall Chemistry

The biotechnological potential of nine decay fungi collected from stored beech logs at a pulp and paper factory yard in Northern Iran was investigated. Beech blocks exposed to the fungi in a laboratory decay test were used to study changes in cell wall chemistry using both wet chemistry and spectroscopic methods. Pleurotus ostreatus, P. pulmonarius, and Lentinus sajor-caju caused greater lignin breakdown compared to other white-rot fungi, which led to a 28% reduction in refining energy. Trametesversicolor caused the greatest glucan loss, while P. ostreatus and L. sajor-caju were associated with the lowest losses of this sugar. Fourier transform infrared spectroscopy (FTIR) analyses indicated that white-rot fungi caused greater lignin degradation in the cell walls via the oxidation aromatic rings, confirming the chemical analysis. The rate of cellulose and lignin degradation by the T.versicolor and Pleurotus species was high compared to the other decay fungi analyzed in this study. Based on the above information, we propose that, among the fungi tested, P. ostreatus (27.42% lignin loss and 1.58% cellulose loss) and L. sajor-caju (29.92% lignin loss and 5.95% cellulose loss) have the greatest potential for biopulping.

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Decay resistance of wood treated with amino-silicone compounds

Holzforschung ◽

10.1515/hf.2008.016 ◽

2008 ◽

Vol 62 (1) ◽

pp. 112-118 ◽

Cited By ~ 20

Author(s):

Oliver Weigenand ◽

Miha Humar ◽

Geoffrey Daniel ◽

Holger Militz ◽

Carsten Mai

Keyword(s):

Beech Wood ◽

White Rot Fungi ◽

Brown Rot ◽

Decay Resistance ◽

Solute Concentration ◽

White Rot ◽

White Rot Fungus ◽

European Standard ◽

Brown Rot Fungi ◽

Amino Silicone

AbstractAn amino-silicone (AS; amino-polydimethylsiloxane) micro-emulsion was tested for its suitability to preserve wood against basidiomycetes in a mini-block experiment and in a test according to the European standard (1996) EN 113. Decay resistance was assessed against the white rot fungiTrametes versicolor,Ceriporiopsis subvermispora, andHypoxylon fragiforme, as well as the brown rot fungiConiophora puteana,Antrodia vaillantii,Gloeophyllum trabeumandSerpula lacrymans. Pine sapwood and beech wood were treated with AS emulsions at solute concentration levels of 2%, 5% and 15%. The mini-blocks treated with 15% concentrations of AS resisted decay byT. versicolorandC. puteanaover a long time (12 weeks), while samples treated with low and moderate concentrations underwent considerable mass losses. Accordingly, microscopic studies revealed a high degree of colonisation by the white rot fungus and loss of cell wall integrity (brown rot) in samples treated with 2% AS. At high AS content (15%), no or only initial stages of decay could be observed. In the European standard (1996) test EN 113, the mass loss in all fungal cultures except for the white rot ascomyceteH. fragiformewas below 5%, when the samples were treated with 15% AS. The effect of low and moderate AS concentration on the decay resistance was dependent on the fungal strain. The mode of action of AS treatment against basidiomycete decay is discussed.

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