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Biodiversité interspécifique et intraspécifique des extractibles nodaux

Abstract : Wood is a renewable material used by man for construction, furniture, paper making, energy, etc. Wood contains extractives of great economic value which belong to various chemical families such as terpenes, flavonoids, tannins, etc. The knots (base of the branch embedded in the trunk) of some tree species are extremely rich in extractives.This study aims at analysing the inter-specific, intra-specific and within-tree variabilities of knotwood extractives to target the richest species, stations and tree parts. For that purpose, the knots of twenty-three species and those of fifteen firs grown under different conditions were extracted using several solvents and analysed. The results confirm the richness of knots compared to heartwood and sapwood for all species. Overall softwood knots contain mainly more extractives than hardwoods. The main compounds identified in softwoods are lignans, stilbenes, flavonoids and terpenes Gallic acid and flavonoids are present in hardwoods. The study of the vertical profile shows that concentrations decrease from the base of the crown to the tree tip. In addition, the results highlight the influence of growth conditions since dominant trees and/or those grown according to dynamic silvicultures are particularly rich in knot extractives. These results allow considering the valorization of wood industries by-products as bioactive molecules resource for various applications.
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Submitted on : Friday, September 30, 2016 - 5:12:08 PM
Last modification on : Friday, August 5, 2022 - 2:38:11 PM
Long-term archiving on: : Saturday, December 31, 2016 - 4:25:55 PM


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  • HAL Id : tel-01374613, version 1


Zineb Kebbi-Benkeder. Biodiversité interspécifique et intraspécifique des extractibles nodaux. Sylviculture, foresterie. AgroParisTech, 2015. Français. ⟨NNT : 2015AGPT0072⟩. ⟨tel-01374613⟩



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