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Author |
Almeras, T.; Gril, J. |
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Title |
Mechanical analysis of the strains generated by water tension in plant stems. Part 1: stress transmission from the water to the cell walls |
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Journal Article |
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Year |
2007 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
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27 |
Issue |
11 |
Pages |
1505-1516 |
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Keywords |
biomechanics; cell mechanics; diurnal strains; mechanical model; multilayer cylinder; stress transtnissionjactor |
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Abstract |
Plant tissues shrink and swell in response to changes in water pressure. These strains can be easily measured, e.g., at the surface of tree stems, to obtain indirect information about plant water status and other physiological parameters. We developed a mechanical model to clarify how water pressure is transmitted to cell walls and causes shrinkage of plant tissues, particularly in the case of thick-walled cells such as wood fibers. Our analysis shows that the stress inside the fiber cell walls is lower than the water tension. The difference is accounted for by a stress transmission factor that depends on two main effects. The first effect is the dilution of the stress through the cell wall, because water acts at the lumen border and is transmitted to the cuter border of the cell, which has a larger circumference. The second effect is the partial conversion of radial stress into tangential stress. Both effects are quantified as functions of parameters of the cell wall structure and its mechanical properties. |
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INRA, UMR Ecofog, F-97379 Kourou, French Guiana, France, Email: t_almeras@hotmail.com |
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HERON PUBLISHING |
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0829-318X |
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ISI:000250847000001 |
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EcoFoG @ eric.marcon @ |
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152 |
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Author |
Coste, S.; Roggy, J.C.; Imbert, P.; Born, C.; Bonal, D.; Dreyer, E. |
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Title |
Leaf photosynthetic traits of 14 tropical rain forest species in relation to leaf nitrogen concentration and shade tolerance |
Type |
Journal Article |
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Year |
2005 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
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Volume |
25 |
Issue |
9 |
Pages |
1127-1137 |
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Keywords |
functional diversity; leaf carbon; leaf nitrogen; nitrogen-use efficiency; photosynthetic capacity; tropical rain forest |
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Abstract |
Variability of leaf traits related to photosynthesis was assessed in seedlings from 14 tree species growing in the tropical rain forest of French Guiana. Leaf photosynthetic capacity (maximum rate of carboxylation and maximum rate of electron transport) was estimated by fitting a biochemical model of photosynthesis to response curves of net CO2 assimilation rate versus intercellular CO2 mole fraction. Leaf morphology described by leaf mass per unit leaf area (LMA), density and thickness, as well as area- and mass-based nitrogen (N) and carbon (C) concentrations, were recorded on the same leaves. Large interspecific variability was detected in photosynthetic capacity as well as in leaf structure and leaf N and C concentrations. No correlation was found between leaf thickness and density. The correlations between area- and mass-based leaf N concentration and photosynthetic capacity were poor. Conversely, the species differed greatly in relative N allocation to carboxylation and bioenergetics. Principal component analysis (PCA) revealed that, of the recorded traits, only the computed fraction of total leaf N invested in photosynthesis was tightly correlated to photosynthetic capacity. We also used PCA to test to what extent species with similar shade tolerances displayed converging leaf traits related to photosynthesis. No clear-cut ranking could be detected among the shade-tolerant groups, as confirmed by a one-way ANOVA. We conclude that the large interspecific diversity in photosynthetic capacity was mostly explained by differences in the relative allocation of N to photosynthesis and not by leaf N concentration, and that leaf traits related to photosynthetic capacity did not discriminate shade-tolerance ranking of these tropical tree species. |
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CNRS Ecol Forets Guyane, INRA, ENGREF,CIRAD, Unite Mixte Rech, Kourou 97387, French Guiana, Email: roggy.j@cirad.fr |
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HERON PUBLISHING |
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0829-318X |
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ISI:000231555200005 |
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EcoFoG @ eric.marcon @ |
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230 |
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Author |
Bosc, A.; De Grandcourt, A.; Loustau, D. |
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Title |
Variability of stem and branch maintenance respiration in a Pinus pinaster tree |
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Journal Article |
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Year |
2003 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
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Volume |
23 |
Issue |
4 |
Pages |
227-236 |
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Keywords |
model; nitrogen; phloem; sapwood; temperature |
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The relationship between maintenance respiration (R.) of woody organs and their structural characteristics was explored in adult Pinus pinaster Ait. trees. We measured R-m on 75 stem and branch segments of different ages (from 3 to 24 years) and diameters (from 1 to 35 cm). The temperature response of R-m was derived from field measurements based on a classical exponential function with Q(10) = 2.13. Relationships between R-m and the dimensions of the woody organs were analyzed under controlled conditions in the laboratory. The surface area of a woody organ was a better predictor of R-m than volume, but surface area failed to account for the observed within-tree variability of R-m among stems, branches and twigs. Two simple models were proposed to predict the variability of R-m at 15 degreesC in an adult tree. Model 1, a linear function model based on the dry mass and nitrogen concentration of sapwood and phloem tissues, explained most of the variability of R-m in branches and stems (R-2 = 0.97). We concluded that the respective contributions of the phloem and sapwood depend on the location and diameter of the woody organ. Model 2, a power-law function model based on the length, diameter and age of the sample, explained the same variance of R-m as Model 1 and is appropriate for scaling R-m to the stand level. Models 1 and 2 appear to explain a larger variability of R-m than models based on stem area or sapwood mass. |
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INRA, F-33612 Cestas, France, Email: alexandre.bosc@pierroton.inra.fr |
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HERON PUBLISHING |
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0829-318X |
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ISI:000181841200002 |
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EcoFoG @ eric.marcon @ |
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246 |
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Cochard, H.; Coste, S.; Chanson, B.; Guehl, J.M.; Nicolini, E. |
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Title |
Hydraulic architecture correlates with bud organogenesis and primary shoot growth in beech (Fagus sylvatica) |
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Journal Article |
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Year |
2005 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
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Volume |
25 |
Issue |
12 |
Pages |
1545-1552 |
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Keywords |
development; hydraulic conductance; leaf primordia; meristem; xylem |
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In beech (Fagus sylvatica L.), the number of leaf primordia preformed in the buds determines the length and the type (long versus short) of annual growth units, and thus, branch growth and architecture. We analyzed the correlation between the number of leaf primordia and the hydraulic conductance of the vascular system connected to the buds. Terminal buds of short growth units and axillary buds of long growth units on lower branches of mature trees were examined. Buds with less than four and more than five leaf primordia formed short and long growth units, respectively. Irrespective of the type of growth unit the bud was formed on, the occurrence of a large number of leaf primordia was associated with high xylem hydraulic conductance. Xylem conductance was correlated to the area of the outermost annual ring. These results suggest that organogenesis and primary growth in buds correlates with secondary growth of the growth units and thus with their hydraulic architecture. Possible causal relationships between the variables are discussed. |
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INRA UBP, UMR PIAF, F-63039 Clermont Ferrand, France, Email: cochard@clermont.inra.fr |
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HERON PUBLISHING |
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0829-318X |
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ISI:000234019900008 |
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EcoFoG @ webmaster @ |
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281 |
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Author |
De Deurwaerder, H.; Hervé-Fernández, P.; Stahl, C.; Burban, B.; Petronelli, P.; Hoffman, B.; Bonal, D.; Boeckx, P.; Verbeeck, H. |
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Title |
Liana and tree below-ground water competition – evidence for water resource partitioning during the dry season |
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Journal Article |
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Year |
2018 |
Publication |
Tree Physiology |
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38 |
Issue |
7 |
Pages |
1071-1083 |
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To date, reasons for the increase in liana abundance and biomass in the Neotropics are still unclear. One proposed hypothesis suggests that lianas, in comparison with trees, are more adaptable to drought conditions. Moreover, previous studies have assumed that lianas have a deeper root system, which provides access to deeper soil layers, thereby making them less susceptible to drought stress. The dual stable water isotope approach (δ18O and δ2H) enables below-ground vegetation competition for water to be studied. Based on the occurrence of a natural gradient in soil water isotopic signatures, with enriched signatures in shallow soil relative to deep soil, the origin of vegetation water sources can be derived. Our study was performed on canopy trees and lianas reaching canopy level in tropical forests of French Guiana. Our results show liana xylem water isotopic signatures to be enriched in heavy isotopes in comparison with those from trees, indicating differences in water source depths and a more superficial root activity for lianas during the dry season. This enables them to efficiently capture dry season precipitation. Our study does not support the liana deep root water extraction hypothesis. Additionally, we provide new insights into water competition between tropical canopy lianas and trees. Results suggest that this competition is mitigated during the dry season due to water resource partitioning. |
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0829-318x |
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10.1093/treephys/tpy002 |
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EcoFoG @ webmaster @ |
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848 |
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Kiaer, L.P.; Felber, F.; Flavell, A.; Guadagnuolo, R.; Guiatti, D.; Hauser, T.P.; Olivieri, A.M.; Scotti, I.; Syed, N.; Vischi, M.; van de Wiel, C.; Jorgensen, R.B. |
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Title |
Spontaneous gene flow and population structure in wild and cultivated chicory, Cichorium intybus L |
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Journal Article |
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2009 |
Publication |
Genetic Resources and Crop Evolution |
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Genet. Resour. Crop Evol. |
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56 |
Issue |
3 |
Pages |
405-419 |
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AFLP; GM co-existence; Gene dispersal; Introgression; Risk assessment; SSAP |
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Spontaneous gene flow between wild and cultivated chicory, Cichorium intybus L., may have implications for the genetic structure and evolution of populations and varieties. One aspect of this crop-wild gene flow is the dispersal of transgenes from genetically modified varieties, e.g. gene flow from GM chicory to natural chicory could have unwanted consequences. With the purpose to identify and quantify crop-wild gene flow in chicory, we analysed introgression in 19 wild chicory populations and 16 accessions of chicory varieties and landraces distributed across Northern, Central and Mediterranean Europe. The analysis used 281 AFLP markers and 75 SSAP markers giving a total of 356 polymorphic markers. Results from model based assignments with the program STRUCTURE indicated many incidents of recent gene flow. Gene flow was observed both between cultivars and wild populations, between landraces and wild populations, between different wild populations as well as between cultivars. Population structure visualized by distance-based clustering showed a North-South geographical structuring of the wild populations, and a general grouping of the cultivars corresponding to known origin. The results indicated, however, that the structuring between the two groups of wild and cultivated types was weak. As crop and wild recipients are genetically close and genes are transferred between the two types rather frequently, focus on mitigating crop-wild gene flow should be increased, before transgenic varieties are cultivated openly. |
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[Kiaer, L. P.; Jorgensen, R. B.] DTU, Riso Natl Lab, Biosyst Dept, DK-4000 Roskilde, Denmark, Email: rikke.bagger.jorgensen@risoe.dk |
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SPRINGER |
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0925-9864 |
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ISI:000264835300011 |
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EcoFoG @ eric.marcon @ |
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204 |
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Ruelle, J.; Clair, B.; Beauchene, J.; Prevost, M.F.; Fournier, M. |
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Title |
Tension wood and opposite wood in 21 tropical rain forest species 2. Comparison of some anatomical and ultrastructural criteria |
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Journal Article |
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Year |
2006 |
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IAWA Journal |
Abbreviated Journal |
IAWA J. |
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Volume |
27 |
Issue |
4 |
Pages |
341-376 |
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Keywords |
tension wood; opposite wood; tropical rain forest; vessels; wood anatomy; wood fibre |
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Abstract |
The anatomy of tension wood and opposite wood was compared in 21 tropical rain forest trees from 21 species belonging to 18 families from French Guyana. Wood specimens were taken from the upper and lower sides of naturally tilted trees. Measurement of the growth stress level ensured that the two samples were taken from wood tissues in a different mechanical state: highly tensile-stressed wood on the upper side, called tension wood and normally tensile-stressed wood on the lower side, called opposite wood. Quantitative parameters relating to fibres and vessels were measured on transverse sections of both tension and opposite wood to check if certain criteria can easily discriminate the two kinds of wood. We observed a decrease in the frequency of vessels in the tension wood in all the trees studied. Other criteria concerning shape and surface area of the vessels, fibre diameter or cell wall thickness did not reveal any general trend. At the ultrastructural level, we observed that the microfibril angle in the tension wood sample was lower than in opposite wood in all the trees except one (Licania membranacea). |
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UAG, ENGREF,UMR Ecol Forets Guyane, INRA,ECOFOG, CIRAD,CNRS, F-97379 Kourou, Guyana, Email: ruelle_j@kourou.cirad.fr |
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INT ASSOC WOOD ANATOMISTS |
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0928-1541 |
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ISI:000242437400001 |
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EcoFoG @ eric.marcon @ |
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171 |
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Clair, B.; Ruelle, J.; Beauchene, J.; Prevost, M.F.; Fournier, M. |
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Tension wood and opposite wood in 21 tropical rain forest species 1. Occurrence and efficiency of the G-layer |
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Journal Article |
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Year |
2006 |
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IAWA Journal |
Abbreviated Journal |
IAWA J. |
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27 |
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3 |
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329-338 |
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Keywords |
gelatinous layer; G-layer; French Guyana; tropical rain forest; tension wood; wood anatomy |
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Wood samples were taken from the upper and lower sides of 21 naturally tilted trees from 18 families of angiosperms in the tropical rain forest in French Guyana. The measurement of growth stresses ensured that the two samples were taken from wood tissues in a different mechanical state: highly tensile stressed wood on the upper side, called tension wood, and lower tensile stressed wood on the lower side, called opposite wood. Eight species had tension wood fibres with a distinct gelatinous layer (G-layer). The distribution of gelatinous fibres varied from species to species. One of the species, Casearia javitensis (Flacourtiaceae), showed a peculiar multilayered secondary wall in its reaction wood. Comparison between the stress level and the occurrence of the G-layer indicates that the G-layer is not a key factor in the production of high tensile stressed wood. |
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UAG, INRA, ENGREF, CIRAD CNRS,ECOFOG,UMR Ecol Forets Guyane, F-97379 Kourou, Guyana, Email: clair@lmgc.univ-montp2.fr |
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INT ASSOC WOOD ANATOMISTS |
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0928-1541 |
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ISI:000240542400008 |
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EcoFoG @ eric.marcon @ |
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176 |
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Clair, B.; Gril, J.; Baba, K.; Thibaut, B.; Sugiyama, J. |
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Title |
Precautions for the structural analysis of the gelatinous layer in tension wood |
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Journal Article |
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Year |
2005 |
Publication |
IAWA Journal |
Abbreviated Journal |
IAWA J. |
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26 |
Issue |
2 |
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189-195 |
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Keywords |
artefact; fibre wall; gelatinous layer (G-layer); tension wood |
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The gelatinous layer (G-layer) of tension wood fibres in hardwood contributes to the mechanical function of the living tree and has significant consequences on properties of solid wood. Its size, shape and structure observed by optical or electron microscopy exhibits characteristic anatomical features. However, we found that sectioning of non-embedded wood samples results in an uncontrolled swelling of the G-layer. In order to assess this artefact, the shape and thickness of the G-layer was monitored by serial sections from an embedded wood sample, from its trimmed transverse face to that located several hundreds of micrometres deep. The results revealed that the initial cutting before embedding produced a border effect responsible for the swollen nature, which is similar to sections from non-embedded material. After a conventional embedding technique was applied, a section of at least 30 micrometres below the trimming surface is required to observe an un-swollen G-layer. |
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Kyoto Univ, Res Inst Sustainable Humanosphere, Lab Biomass Morphogenesis & Informat, Kyoto 6110011, Japan, Email: clair@blmgc.univ.montp2.fr |
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INT ASSOC WOOD ANATOMISTS |
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0928-1541 |
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ISI:000229698100003 |
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EcoFoG @ eric.marcon @ |
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254 |
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Clair, B.; Arinero, R.; Leveque, G.; Ramonda, M.; Thibaut, B. |
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Title |
Imaging the mechanical properties of wood cell wall layers by atomic force modulation microscopy |
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Journal Article |
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Year |
2003 |
Publication |
IAWA Journal |
Abbreviated Journal |
IAWA J. |
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24 |
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3 |
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223-230 |
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Keywords |
wood; cell wall; mechanical properties; elastic modulus; tension wood |
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Atomic Force Microscopy in force modulation mode was used to study the elastic properties of the different fibre wall layers of the tension wood of holm oak and normal wood of boco. The method is based on the measurement of the resonance frequency of the microscope lever in contact with the sample. This frequency is related to the reduced Young modulus E* = E/(1-nu(2)) of the material, supposed to be isotropic. 'Elastic' images of the cell are obtained simultaneously with the topographic images, which allows the observation of the mechanical properties of the cells at a nanometric scale. Layers G, S-1, S-2 and ML can clearly be distinguished. By comparison with known materials an estimation of the absolute modulus is given in the range 5-20 GPa, but should be considered with caution, because the inherent anisotropy of the materials has not been taken into account. |
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Univ Montpellier 2, CNRS, UMR 5508, Lab Mecan & Genie Civil, F-34095 Montpellier, France |
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INT ASSOC WOOD ANATOMISTS |
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0928-1541 |
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ISI:000185049700003 |
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EcoFoG @ eric.marcon @ |
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270 |
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