The concentration of phenolics in brown-rot decay resistant and susceptible Scots pine heartwood

2004 ◽  
Vol 38 (2) ◽  
pp. 109-118 ◽  
Author(s):  
Martti Ven�l�inen ◽  
Pirkko Velling ◽  
Anni M. Harju ◽  
Pekka Saranp�� ◽  
Pirjo Kainulainen ◽  
...  
Keyword(s):  
Scots Pine ◽  
Brown Rot ◽  
Brown Rot Decay

scholarly journals Cellular level chemical changes in Scots pine heartwood during incipient brown rot decay

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Tiina Belt ◽  
Michael Altgen ◽  
Mikko Mäkelä ◽  
Tuomas Hänninen ◽  
Lauri Rautkari
Keyword(s):  
Scots Pine ◽  
Brown Rot ◽  
Cellular Level ◽  
Chemical Changes ◽  
Brown Rot Decay

Stilbene impregnation retards brown-rot decay of Scots pine sapwood

Holzforschung ◽  
2016 ◽  
Vol 70 (3) ◽  
pp. 261-266 ◽  
Author(s):  
Jinrong Lu ◽  
Martti Venäläinen ◽  
Riitta Julkunen-Tiitto ◽  
Anni M. Harju
Keyword(s):  
Scots Pine ◽  
Fungal Growth ◽  
Brown Rot ◽  
Monomethyl Ether ◽  
Wood Preservation ◽  
High Concentration ◽  
Brown Rot Fungi ◽  
Decay Test ◽  
Antifungal Efficiency ◽  
Brown Rot Decay

Abstract Stilbenes are abundant in the heartwood of Scots pine (Pinus sylvestris L.) and are known to have strong antifungal efficiency. In this study, Scots pine sapwood blocks were impregnated with crude heartwood extract containing the stilbenes pinosylvin (PS) and the pinosylvin monomethyl ether (PSM). Impregnated blocks were submitted to brown-rot fungi, Coniophora puteana, Gloeophyllum trabeum, and Rhodonia (Poria) placenta, and fungal growth test and decay test were performed. Both tests showed that the impregnation with a high concentration of stilbenes (60 mg g-1 dry wood) significantly suppressed the growth of fungi and slowed down the decay process of wood blocks, especially in case of G. trabeum. However, chemical analysis showed that PS and PSM were degraded by all the three types of fungi, obviously via modification to resveratrol and methylresveratrol. Rhodonia placenta displayed the fastest rate of degradation. Thus, impregnation with biodegradable stilbenes could be a viable alternative for wood preservation only in service situations with low or transient risk of decay.

Chemical factors affecting the brown-rot decay resistance of Scots pine heartwood

Trees ◽  
2003 ◽  
Vol 17 (3) ◽  
pp. 263-268 ◽  
Author(s):  
Anni M. Harju ◽  
Martti Venäläinen ◽  
Seija Anttonen ◽  
Hannu Viitanen ◽  
Pirjo Kainulainen ◽  
...  
Keyword(s):  
Scots Pine ◽  
Brown Rot ◽  
Decay Resistance ◽  
Factors Affecting ◽  
Chemical Factors ◽  
Brown Rot Decay

Effects of white rot and brown rot decay on the drilling resistance measurements in wood

Holzforschung ◽  
2018 ◽  
Vol 72 (10) ◽  
pp. 905-913 ◽  
Author(s):  
Evgenii Sharapov ◽  
Christian Brischke ◽  
Holger Militz ◽  
Elena Smirnova
Keyword(s):  
Scots Pine ◽  
Free Water ◽  
Brown Rot ◽  
European Beech ◽  
White Rot ◽  
Drilling Tool ◽  
Significant Difference ◽  
Brown Rot Decay ◽  
Drilling Resistance ◽  
The Impact

AbstractAn IML-RESI PD 400 drilling tool and a standard spade drill bit (IML System GmbH, Wiesloch, Germany) were used to study the impact of white and brown rot decay on drilling resistance (DR) measurements in wood. In total, 720 drillings were made in specimens of Scots pine (Pinus sylvestrisL.) heartwood and sapwood, European beech (Fagus sylvaticaL.) and English oak (Quercus roburL.), which were decayed byConiophora puteanaandTrametes versicolor. Drillings were made with specimens conditioned in normal climate (20°C/65% RH) and with specimens vacuum-impregnated in water. DR and feeding force (FF) were negatively correlated with mass loss (ML) due to fungal decay. The intensity of reduction was higher for DR than for FF with increasing ML for all decay types and moisture contents (MCs). A significant difference (at 95% confidence level) in DR was found between decay types using water-saturated (WS) Scots pine specimens (3–35% ML). In most cases, DR revealed a higher predictive power of the models for ML prediction than FF. Free water in decayed specimens significantly reduced the DR and FF. Hence, the effect of ML on DR and FF of decayed and WS wood was less prominent.

scholarly journals The effect of brown-rot decay on water adsorption and chemical composition of Scots pine heartwood

2008 ◽  
Vol 65 (6) ◽  
pp. 610-610 ◽  
Author(s):  
Outi Karppanen ◽  
Martti Venäläinen ◽  
Anni M. Harju ◽  
Tapio Laakso
Keyword(s):  
Chemical Composition ◽  
Scots Pine ◽  
Water Adsorption ◽  
Brown Rot ◽  
Brown Rot Decay

Colour of larch heartwood and relationships to extractives and brown-rot decay resistance

Trees ◽  
2004 ◽  
Vol 18 (1) ◽  
pp. 102-108 ◽  
Author(s):  
Notburga Gierlinger ◽  
Dominique Jacques ◽  
Michael Grabner ◽  
Rupert Wimmer ◽  
Manfred Schwanninger ◽  
...  
Keyword(s):  
Brown Rot ◽  
Decay Resistance ◽  
Brown Rot Decay

Myofibrillar cell wall extensions in the hyphal sheath of Postia placenta

1992 ◽  
Vol 38 (9) ◽  
pp. 905-911 ◽  
Author(s):  
Michael J. Larsen ◽  
Frederick Green III
Keyword(s):  
Cell Wall ◽  
Brown Rot ◽  
Decay Process ◽  
Structural Components ◽  
Hyphal Cell ◽  
Postia Placenta ◽  
Glass Cover ◽  
Hyphal Sheath ◽  
Brown Rot Decay ◽  
Extracellular Structures

Evidence is provided for the existence of linear extracellular fibrillar elements in the brown-rot fungus Postia placenta. These elements appear as structural components of the hyphal sheath and more closely resemble mycofibrils than fungal fimbriae. Mycofibrils are associated with and appear to originate from the hyphal surface when hyphae are grown on wood or inert substrates, such as glass cover slips and polycarbonate filters. These extracellular structures have a nominal diameter of 10–50 nm and are up to 25 μm in length. We conclude that mycofibrils are linear structural extensions of the hyphal cell wall. The precise function of mycofibrils in the brown-rot decay process of wood remains to be elucidated. Key words: Postia placenta, mycofibrils, fungal fimbriae, hyphal sheath, electron microscopy.

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