Properties of reaction zones associated with decay from pruning wounds in plantation‐grown <i>Eucalyptus nitens</i>

Barry, KM; Pearce, R.B.; Mohammed, Caroline

doi:10.1046/j.1439-0329.2000.00206.x

Cited by 26 publications

(26 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Patterns of decay observed in the E. nitens sapwood are explained by processes of compartmentalization, as previously discussed (Barry 2001;Barry et al 2000Barry et al , 2001Barry et al , 2002. In the wounded trees, decay was restricted in the extant sapwood by a barrier zone; beyond the wound, reaction zones restricted tangential and radial spread.…”

Section: Discussionsupporting

confidence: 60%

The effect of time and site on incidence and spread of pruning-related decay in plantation-grown Eucalyptus nitens

Barry¹,

Hall²,

Mohammed³

2005

Can. J. For. Res.

View full text Add to dashboard Cite

Quantitative information on stem decay in eucalypt plantations grown for solid wood products, with consideration of the effect of site, pruning, and spread of decay with time, is required for the prediction of harvest yield and quality. A trial at three Eucalyptus nitens (Dean & Maiden) Maiden plantations in Tasmania revealed that the effect of time on the number and size of decay columns was substantially greater than the effect of site or of whether trees were pruned or not. Length of decay columns was 3.4-fold greater on average for the trees assessed 5.5 years after pruning than at 1 year. All decay columns in pruned trees were restricted to the knotty core, and the amount of decay-free clearwood increased over time. A controlled wounding trial showed that decay in sapwood was not significantly different in length with site but was mainly determined by the fungal species used. Ongoing research to monitor the spread of decay in pruned plantation-grown E. nitens will be important to enable prediction of the future impact of decay on harvest yields of solid wood products. Résumé :Il est nécessaire d'avoir des données quantitatives sur la carie de tronc dans les plantations d'eucalyptus destinées à la production de bois d'oeuvre pour prédire le rendement et la qualité lors de la récolte en tenant compte de l'effet de la station, de l'élagage et de la progression de la carie dans le temps. Une étude réalisée dans trois plantations d'Eucalyptus nitens (Dean & Maiden) Maiden, en Tasmanie, a révélé que l'effet du temps sur le nombre de colonnes de carie et sur leur dimension est substantiellement plus important que celui de la station ou du fait que les arbres aient été élagués ou non. Les colonnes de carie étaient en moyenne 3,4 fois plus longues chez les arbres examinés 5,5 ans plutôt qu'un an après avoir été élagués. Toutes les colonnes de carie dans les arbres élagués étaient limitées au noeud lui-même et la quantité de bois clair, exempt de carie, augmentait avec le temps. Un test avec des blessures standardisées a démontré que la longueur de la carie dans le bois d'aubier n'était pas significativement différente selon la station mais qu'elle était principalement déterminée par l'espèce de champignon utilisée. Les travaux de recherche en cours pour suivre le développement de la carie dans les plantations de E. nitens seront importants pour être en mesure de prédire l'impact futur de la carie sur les rendements en produits de bois massif au moment de la récolte.[Traduit par la Rédaction] Barry et al. 502

show abstract

Section: Discussionsupporting

confidence: 60%

The effect of time and site on incidence and spread of pruning-related decay in plantation-grown Eucalyptus nitens

Barry¹,

Hall²,

Mohammed³

2005

Can. J. For. Res.

View full text Add to dashboard Cite

show abstract

“…When examining relationships between decay incidence or extent with wood chemistry, it is important to distinguish between the chemistry found for normal healthy wood, and that found in diseased wood or in the reaction zone between healthy and diseased wood. It has been reported previously that the extractives and lignin contents are elevated in response to decay in eucalypts [5,18], with the extractives content found to be six times greater in the reaction zone compared to healthy sapwood [6]. Only negative locality level correlations were found in the current study between the extent of decay and both extractives and lignin contents.…”

Section: Correlations Amongst Wood Propertiescontrasting

confidence: 53%

Genetic parameters for lignin, extractives and decay inEucalyptus globulus

et al. 2006

View full text Add to dashboard Cite

-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 ...

show abstract

“…Recent studies of distinct Eucalyptus nitens reaction zones ( formed in response to decay associated with naturallyinfected pruning wounds) found a number of dierences in various properties compared to the reaction zones reported from other angiosperms [3]. For example, potassium levels, pH and water content were lower in the E. nitens reaction zone than healthy sapwood.…”

Section: Introductionmentioning

confidence: 93%

Initial defence responses in sapwood of Eucalyptus nitens(Maiden) following wounding and fungal inoculation

Barry

Pearce

Evans

et al. 2001

Physiological and Molecular Plant Pathology

View full text Add to dashboard Cite

Xylem defence responses occurring in pot-grown Eucalyptus nitens (Maiden) saplings were analysed within the ®rst few weeks following stem wounding and inoculation with the non-aggressive decay fungus Ganoderma adspersum (Schulz). The fungus colonized the dead xylem cells up to 5 mm above and below the wound after 30 days. Evidence of xylem cell death and discolouration was detectable within 12 h and vessel tyloses were present after 3 days. Concentration of tetra-galloylglucose increased by 3 . 5-fold within 24 h, while the trend for total phenols was a slow increase reaching a maximum after 21 days. Suberin was not detected. Early accumulation of water content has been proposed as a defence component of host± pathogen interactions in woody angiosperm xylem, but this was not obvious for E. nitens. Nuclear magnetic resonance imaging (NMR imaging or MRI) was used to measure small-scale distributions in moisture content around the inoculated stem wounds in intact E. nitens saplings. Some moisture accumulation was detectable at lesion margins of wounds analysed after 3 weeks. However, this was not detectable by gravimetric measurements. This increase in moisture content may be a consequence of wound physiology rather than an active defence response.*

show abstract

Properties of reaction zones associated with decay from pruning wounds in plantation‐grown Eucalyptus nitens

Cited by 26 publications

References 39 publications

The effect of time and site on incidence and spread of pruning-related decay in plantation-grown Eucalyptus nitens

The effect of time and site on incidence and spread of pruning-related decay in plantation-grown Eucalyptus nitens

Genetic parameters for lignin, extractives and decay inEucalyptus globulus

Initial defence responses in sapwood of Eucalyptus nitens(Maiden) following wounding and fungal inoculation

Contact Info

Product

Resources

About