Wood Color, Basic Density, and Decay Resistance in Heartwood of Fast-Grown<i>Eucalyptus grandis</i>Hill ex Maiden

Nelson, Neil D.; Heather, W. A.

doi:10.1515/hfsg.1972.26.2.54

Cited by 14 publications

(11 citation statements)

References 9 publications

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“…However, the extent of decay showed significant phenotypic correlations with basic density (age 11, negative), even with the South King Island locality removed from the analysis. Similar negative correlations have also been found in E. delegatensis and E. grandis [27,43]. It has been proposed that lower density wood has wider cell lumina, and therefore a larger surface area is exposed to the enzymes of decay micro-organisms, and also the water and air content in the wood may be at a level that promotes fungal growth [36].…”

Section: Correlations Amongst Wood Propertiessupporting

confidence: 67%

Genetic parameters for lignin, extractives and decay inEucalyptus globulus

et al. 2006

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-Eucalyptus globulus is grown in temperate regions of the world for pulp production. The chemical and physical properties of its wood make it highly suited to this purpose. This study analysed genetic variation in lignin content, extractives content and decay, for nine localities of E. globulus. Heritability estimates were also obtained, and the relationships between these traits and physical wood traits and growth were examined. Significant genetic variation was found between localities for lignin content (Klason lignin and acid-soluble lignin contents) and decay. The only trait for which significant variation between families within locality was detected was acid-soluble lignin content, which resulted in this trait also having the highest narrow-sense heritability (0.51 ± 0.26). However, family means heritabilities were high for lignin content, extractives content and decay (0.42-0.64). The chemical wood traits were strongly correlated with each other both phenotypically and genetically, with important correlations found with density and microfibril angle. Correlations suggested that during selection for the breeding objective traits, it is likely that favourable states in the chemical wood traits, decay resistance and fibre properties are concurrently being selected, whereas growth may be selected for independently. This initial study provides a stepping stone for future studies where particular localities of the breeding population may be characterised further.correlation / eucalypt / genetic variation / heritability / lignin Résumé -Paramètres génétiques pour la lignine, les extractibles et la pourriture chez Eucalyptus globulus. Eucalyptus globulus est cultivé dans de nombreuses régions tempérées pour la production de pâte à papier. Les propriétés physiques et chimiques de ce bois en font un matériau très apprécié pour cette utilisation. Cette étude analyse les variations génétiques de la teneur en lignine, en composés extractibles et de la sensibilité à la décomposition du bois de neuf provenances de Eucalyptus globulus. L'héritabilité de ces propriétés ainsi que leurs relations avec les caractéristiques physiques du bois et la croissance ont été examinées. Des différences inter-provenances significatives ont été détectées pour les teneurs en lignine (lignines dosées par la méthode de Klason, ou lignines soluble en solution acide) et la vitesse de décomposition. Le seul caractère qui a présenté une variation significative entre familles dans les provenances a été la teneur en lignines solubles en solution acide. De ce fait, une forte héritabilité (au sens strict) a été détectée pour ce caractère (0, 51±0, 26). Cependant, les héritabilités moyennes dans les familles étaient élevées pour la teneur en lignine, les teneurs en composés extractibles et la vitesse de décomposition (0,64). Les caractéristiques chimiques du bois étaient fortement inter-corrélées au niveau phénotypique et génétique, avec des corrélations importantes également avec la densité et l'angle des microfibrilles. Les corrélations ...

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Section: Correlations Amongst Wood Propertiessupporting

confidence: 67%

Genetic parameters for lignin, extractives and decay inEucalyptus globulus

et al. 2006

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“…However, not all compounds convey resistance against pathogen attack (Amusant et al 2004). Nevertheless, many authors have found a direct relationship between wood durability and extractive content (Nelson and Heather 1972;Modesale et al 1996;Haupt et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Decay resistance of Togolese teak (Tectona grandis L.f) heartwood and relationship with colour

Kokutsè

Stokes²,

Baillères

et al. 2006

Trees

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Togolese teak (Tectona grandis L.f) is highly resistant to pathogen attack, but variability in natural durability exists between trees of different ages, plantations and geographical zones. Therefore, further information concerning this parameter of wood quality is necessary; however, traditional testing methods are difficult and timeconsuming to carry out. We tested the possibility of using colorimetry to determine durability in heartwood samples taken from a wide range of trees.Twelve hundred samples from 31 trees were exposed to four fungi: Pycnoporus sanguineus, Antrodia sp., Gloephylum trabeum, and Coriolus versicolor. Wood samples were grouped into three classes (inner, intermediate and outer heartwood). The colour parameters of each sample were then determined using the CIELAB (L * , a * , b * ) system and results correlated with the %mass loss of wood after fungal attack. Tests showed that Antrodia sp. and C. versicolor resulted in <20% mass loss, whereas all samples were rated as durable or highly durable with regard to P. sanguineus and G. trabeum. Inner heartwood was found to be the most resistant to pathogen attack and outer heartwood the least.Measurements of colour showed that heartwood was lightest nearest the pith and darkness and redness increased towards the outer heartwood. Regressions of lightness with %mass loss in the durability tests were always highly significant, whereas a * and b * were not always significantly regressed with %mass loss. Therefore, the use of colorimetry as a tool to estimate short-term natural durability both rapidly and cheaply could be considered in the case of plantation grown teak wood.

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“…However, there may be a correlation between colour and natural durability: biological resistance and wood colour are directly connected with quantitative and qualitative extractives composition [24,29,40]. The effects of extractives on wood colour have been studied by several authors [3,14,28,29]. Extracting extractives using suitable solvents modifies wood colour.…”

Section: Relation Between Colour and Durabilitymentioning

confidence: 99%

“…The relationship between colour and decay resistance has already been studied [10,29]. Colour measurements were therefore performed to determine whether it was possible to correlate wood colour and durability, and use colour as an indicator in classifying the biological resistance of Dicorynia guianensis.…”

Section: Introductionmentioning

confidence: 99%

Decay resistance inDicorynia guianensisAmsh.: analysis of inter-tree and intra-tree variability and relations with wood colour

et al. 2004

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-Dicorynia guianensis Amsh. is very widespread in the forests of French Guiana and moreover is the leading species harvested in this area, but its main defect remains the great variability of wood durability, especially with respect to fungal decay. The aim of this work was to study this inter-and intra-tree variability in order to identify the parameters responsible for this variation (growth area, height and radial position) within the tree. The resistance decrease from the outer heartwood to the pith. Measurement of colour variation using the CIELAB (L*, a*, b*, C*, h*) system was performed at the intra-tree level to highlight the longitudinal and radial gradients of variation. Dicorynia guianensis becomes less red and dark from the outer to the inner heartwood and from the base to the top. Lastly, variations of colour and durability were correlated: the wood is less resistant the redder and darker it is.Dicorynia guianensis / Amazonian wood / wood colour/decay resistance / heartwood / variability Résumé -Variabilité de la durabilité inter-arbre et intra-arbre de Dicorynia guianensis -et relation avec la couleur. Dicorynia Guianensis Amsh. est une essence très répandue dans les forêts de Guyane française. C'est l'une des essences les plus exploitées cependant elle souffre d'un défaut majeur : une grande variabilité de sa durabilité naturelle à l'égard des champignons lignivores (Ascomycètes, Basidiomycètes). À travers l'étude de la variabilité inter-arbre et intra-arbre nous avons discuté de l'influence de paramètres tels : la localité, la taille de l'arbre, la hauteur et la position radiale sur la résistance naturelle. Dans une deuxième partie nous avons étudié l'influence de ces mêmes paramètres sur la mesure de la couleur (système CIELAB) du bois à l'échelle intra-arbre. Nous avons ainsi constaté que le paramètre « position radiale » était de loin le plus important à l'origine de la variabilité : Dicorynia guianensis est plus résistant du duramen interne vers le duramen externe ; moins rouge et moins sombre du duramen externe vers le duramen interne. Enfin, nous avons constaté que les variations de couleur et de durabilité chez Dicorynia guianensis étaient corrélées : le bois est d'autant plus résistant qu'il est moins rouge et plus clair sombre. bois amazonien / couleur du bois / résistance à la pourriture / duramen / variabilité

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Wood Color, Basic Density, and Decay Resistance in Heartwood of Fast-GrownEucalyptus grandisHill ex Maiden

Cited by 14 publications

References 9 publications

Genetic parameters for lignin, extractives and decay inEucalyptus globulus

Genetic parameters for lignin, extractives and decay inEucalyptus globulus

Decay resistance of Togolese teak (Tectona grandis L.f) heartwood and relationship with colour

Decay resistance inDicorynia guianensisAmsh.: analysis of inter-tree and intra-tree variability and relations with wood colour

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