Abstract
The concentrations of three individual stilbenes, pinosylvin (PS), pinosylvin monomethyl ether (PSM), and pinosylvin dimethyl ether (PSD), and the total concentration of phenolic compounds were determined in 34-year-old Scots pines which were known to have either decay-resistant or susceptible heartwood. The sample trees were selected from two progeny tests among 783 trees; the decay resistance of which had been screened earlier in vitro against a brown-rot fungus Coniophora puteana. Ten decay-resistant and ten susceptible trees from each of the progeny tests were analysed. In the heartwood of the resistant trees, the average total concentration of the stilbenes was 7.5 and 6.4 mg/g of dry weight, while in the heartwood of the susceptible trees the respective values were 5.0 and 4.7 mg/g. The difference between the decay resistant and susceptible trees was statistically significant in both progeny tests. The difference in concentration of total phenolics, analysed by the Folin-Ciocalteu method, was also significant. A high concentration of phenolics was connected to the low hygroscopicity of wood. The results support the argued hypothesis that the stilbenes make a contribution to the differences in the decay rate of natural wood substrate. On the other hand, the results show that the stilbenes alone do not explain the variation in decay rate.
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Acknowledgements
This study has been supported by the Academy of Finland (Resource Council for the Environment and Natural Resources, projects no. 43140, 43159 and 620012) and belongs to The Finnish Forest Cluster Research Programme WOOD WISDOM. We thank Arto Haatainen, Heikki Kinnunen, Eija Matikainen, and Jussi Tiainen from Punkaharju Research Station for looking after the wood sampling, Terhi Vuorinen for the chemical analyses in Kuopio, Tapio Laakso and Veikko Kitunen for the GLC-MS analyses in Vantaa, and John Derome for revising the language.
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Venäläinen, M., Harju, A.M., Saranpää, P. et al. The concentration of phenolics in brown-rot decay resistant and susceptible Scots pine heartwood. Wood Sci Technol 38, 109–118 (2004). https://doi.org/10.1007/s00226-004-0226-8
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DOI: https://doi.org/10.1007/s00226-004-0226-8