Hydrophobic and Hydrophilic Extractives in Norway Spruce and Kurile Larch and Their Role in Brown-Rot Degradation
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Hydrophobic and Hydrophilic Extractives in Norway Spruce and Kurile Larch and Their Role in Brown-Rot Degradation. / Fuchtner, Sophie; Brock-Nannestad, Theis; Smeds, Annika; Fredriksson, Maria; Pilgard, Annica; Thygesen, Lisbeth Garbrecht.
I: Frontiers in Plant Science, Bind 11, 855, 2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › fagfællebedømt
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TY - JOUR
T1 - Hydrophobic and Hydrophilic Extractives in Norway Spruce and Kurile Larch and Their Role in Brown-Rot Degradation
AU - Fuchtner, Sophie
AU - Brock-Nannestad, Theis
AU - Smeds, Annika
AU - Fredriksson, Maria
AU - Pilgard, Annica
AU - Thygesen, Lisbeth Garbrecht
PY - 2020
Y1 - 2020
N2 - 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 fungusRhodonia placentafor 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.
AB - 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 fungusRhodonia placentafor 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.
KW - extractives
KW - brown-rot
KW - spruce
KW - larch
KW - durability
KW - moisture content
KW - heartwood
KW - GC-MS
KW - SCOTS PINE KNOTS
KW - WOOD CELL-WALLS
KW - DECAY RESISTANCE
KW - HEARTWOOD EXTRACTIVES
KW - LIPOPHILIC EXTRACTIVES
KW - ANTIOXIDANT ACTIVITY
KW - RELATIVE-HUMIDITY
KW - ENVIRONMENTALLY-BENIGN
KW - MOISTURE SORPTION
KW - EUROPEAN LARCH
U2 - 10.3389/fpls.2020.00855
DO - 10.3389/fpls.2020.00855
M3 - Journal article
C2 - 32695126
VL - 11
JO - Frontiers in Plant Science
JF - Frontiers in Plant Science
SN - 1664-462X
M1 - 855
ER -
ID: 246725975