 |
|
| HAL: hal-00387861, version 1 |
| DOI: 10.1093/jxp/erp133 |
| Detailed view |  Export this paper |
 |
| Journal of Experimental Botany 60 (2009) 3023-3030 |
|
|
|
|
| Mesoporosity as a new parameter for understanding tension stress generation in trees |
|
|
| Shanshan Chang 1, 2Bruno Clair 1 |
|
|
| (2009-05-12) |
|
|
|
| The mechanism for tree orientation in angiosperms is based on the production of high tensile stress on the upper side of the inclined axis. In many species, the stress level is strongly related to the presence of a peculiar layer, called G-layer, in the fibre wall. The structure of G-layer has been recently described as a hydrogel thanks to N2 adsorption-desorption isotherms of supercritically dried samples showing a high mesoporosity (pores size from 2 to 50 nm). This led us to revisit the concept of G-layer that was until now only described from anatomical observation. Adsorption isotherms of both normal wood and tension wood have been measured on six tropical species. Measurements show that mesoporosity is high in tension wood with typical thick G-layer while it is much less with thinner G-layer, sometimes no more than normal wood. The mesoporosity of tension wood species without G-layer is as low as in normal wood. Not depending on the amount of pores, the pore sizes distribution are always centred around 6-12 nm. These results suggest that, among species producing fibres with G-layer, large structural differences of G-layer exist between species |
|
|
|
|
|
|
|
|
|
|
|
| 1: | Laboratoire de mécanique et génie civil (LMGC) |
|
|
|
CNRS : UMR5508 – Université Montpellier II - Sciences et techniques |
|
|
| 2: | College of Materials Science and Technology |
|
|
|
Beijing Forestry University |
|
|
| 3: | School of Bioagricultural Sciences |
|
|
|
Nagoya University |
|
|
| 4: | Ecologie des forêts de Guyane (ECOFOG) |
|
|
|
Centre de coopération internationale en recherche agronomique pour le développement [CIRAD] : UMR93 – CNRS : UMR2728 – Institut national de la recherche agronomique (INRA) : UMR0745 – Université des Antilles et de la Guyane – AgroParisTech |
|
|
| 5: | Institut Charles Gerhardt - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICG ICMMM) |
|
|
|
CNRS : UMR5253 – Université Montpellier I – Université Montpellier II - Sciences et techniques – Ecole Nationale Supérieure de Chimie de Montpellier |
|
|
|
|
|
|
|
|
|
| Mécanique de l'Arbre et du Bois |
|
|
|
|
| Subject | : | Life Sciences/Vegetal Biology/Botanics Life Sciences/Agricultural sciences/Silviculture, forestry |
| hal-00387861, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00387861 | |
| oai:hal.archives-ouvertes.fr:hal-00387861 | |
| From: Francesco Di Renzo | |
| Submitted on: Tuesday, 26 May 2009 09:16:59 | |
| Updated on: Tuesday, 26 March 2013 14:27:54 | |
