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Hydrophobic and Hydrophilic Extractives in Norway Spruce and Kurile Larch and Their Role in Brown-Rot Degradation
University of Copenhagen, Denmark.
University of Copenhagen, Denmark.
Åbo Akademi University, Finland.
Lund University, Sweden.
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2020 (English)In: Frontiers in Plant Science, E-ISSN 1664-462X, Vol. 11, article id 855Article in journal (Refereed) Published
Abstract [en]

Extractives found in the heartwood of a moderately durable conifer (Larix gmelinii var. japonica) were compared with those found in a non-durable one (Picea abies). We identified and quantified heartwood extractives by extraction with solvents of different polarities and gas chromatography with mass spectral detection (GC-MS). Among the extracted compounds, there was a much higher amount of hydrophilic phenolics in larch (flavonoids) than in spruce (lignans). Both species had similar resin acid and fatty acid contents. The hydrophobic resin components are considered fungitoxic and the more hydrophilic components are known for their antioxidant activity. To ascertain the importance of the different classes of extractives, samples were partially extracted prior to subjection to the brown-rot fungus Rhodonia placenta for 2–8 weeks. Results indicated that the most important (but rather inefficient) defense in spruce came from the fungitoxic resin, while large amounts of flavonoids played a key role in larch defense. Possible moisture exclusion effects of larch extractives were quantified via the equilibrium moisture content of partially extracted samples, but were found to be too small to play any significant role in the defense against incipient brow-rot attack.

Place, publisher, year, edition, pages
Frontiers Media S.A. , 2020. Vol. 11, article id 855
Keywords [en]
brown-rot, durability, extractives, GC-MS, heartwood, larch, moisture content, spruce
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-45625DOI: 10.3389/fpls.2020.00855Scopus ID: 2-s2.0-85087867691OAI: oai:DiVA.org:ri-45625DiVA, id: diva2:1458063
Note

Funding details: 17.20.0; Funding details: Villum Fonden, 12404; Funding details: Department of Trade and Industry, DTI; Funding text 1: We would like to thank Stefan Willför from the Åbo Akademi University for kindly providing his facilities for the identification of extractives. Many thanks also go to Morten Alban Knudsen and Sofie Wikkels? Jensen (UCPH, Denmark), Flemming Grauslund (DTI, Denmark), and Anja Vieler (TU Munich, Germany) for their valuable help with experimental practicalities. All the chemical structures were drawn with MarvinSketch? 17.20.0, an application by ChemAxon Ltd. Funding. This project was funded by the VILLUM FONDEN (grant number 12404). The short-term scientific mission to ?bo Akademi University was funded by the Northern European Network for Wood Science and Engineering (WSE).

Available from: 2020-08-13 Created: 2020-08-13 Last updated: 2024-01-17Bibliographically approved

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