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Hydrophobic and Hydrophilic Extractives in Norway Spruce and Kurile Larch and Their Role in Brown-Rot Degradation.
- Source :
-
Frontiers in plant science [Front Plant Sci] 2020 Jun 30; Vol. 11, pp. 855. Date of Electronic Publication: 2020 Jun 30 (Print Publication: 2020). - Publication Year :
- 2020
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Abstract
- 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.<br /> (Copyright © 2020 Füchtner, Brock-Nannestad, Smeds, Fredriksson, Pilgård and Thygesen.)
Details
- Language :
- English
- ISSN :
- 1664-462X
- Volume :
- 11
- Database :
- MEDLINE
- Journal :
- Frontiers in plant science
- Publication Type :
- Academic Journal
- Accession number :
- 32695126
- Full Text :
- https://doi.org/10.3389/fpls.2020.00855