TWIG: a model to simulate the gravitropic response of a tree axis in the frame of elasticity and viscoelasticity, at intra-annual time scale.
Identifieur interne : 002C96 ( Main/Exploration ); précédent : 002C95; suivant : 002C97TWIG: a model to simulate the gravitropic response of a tree axis in the frame of elasticity and viscoelasticity, at intra-annual time scale.
Auteurs : Catherine Coutand [France] ; Jean-Denis Mathias ; Georges Jeronimidis ; Jean-François DestrebecqSource :
- Journal of theoretical biology [ 1095-8541 ] ; 2011.
Descripteurs français
- KwdFr :
- Arbres (croissance et développement), Arbres (physiologie), Bois (physiologie), Cinétique (MeSH), Contrainte mécanique (MeSH), Facteurs temps (MeSH), Gravitropisme (physiologie), Module d'élasticité (physiologie), Modèles biologiques (MeSH), Populus (croissance et développement), Populus (physiologie), Simulation numérique (MeSH), Viscosité (MeSH), Élasticité (MeSH).
- MESH :
- croissance et développement : Arbres, Populus.
- physiologie : Arbres, Bois, Gravitropisme, Module d'élasticité, Populus.
- Cinétique, Contrainte mécanique, Facteurs temps, Modèles biologiques, Simulation numérique, Viscosité, Élasticité.
English descriptors
- KwdEn :
- Computer Simulation (MeSH), Elastic Modulus (physiology), Elasticity (MeSH), Gravitropism (physiology), Kinetics (MeSH), Models, Biological (MeSH), Populus (growth & development), Populus (physiology), Stress, Mechanical (MeSH), Time Factors (MeSH), Trees (growth & development), Trees (physiology), Viscosity (MeSH), Wood (physiology).
- MESH :
- growth & development : Populus, Trees.
- physiology : Elastic Modulus, Gravitropism, Populus, Trees, Wood.
- Computer Simulation, Elasticity, Kinetics, Models, Biological, Stress, Mechanical, Time Factors, Viscosity.
Abstract
Trees are able to maintain or modify the orientation of their axes (trunks or branches) by tropic movements. For axes in which elongation is achieved but cambial growth active, the tropic movements are due to the production of a particular wood, called reaction wood which is prestressed within the growing tree. Several models have been developed to simulate the gravitropic response of axes in trees due to the formation of reaction wood, all within the frame of linear elasticity and considering the wood maturation as instantaneous. The effect viscoelasticity of wood has, to our knowledge, never been considered. The TWIG model presented in this paper aims at simulating the gravitropic movement of a tree axis at the intra-annual scale. In this work we studied both the effect of a non-instantaneous maturation process and of viscoelasticity. For this purpose, we considered the elastic case with maturation considered as an instantaneous process as the reference. The introduction of viscoelasticity in TWIG has been done by coupling TWIG to a model developed for bridges. Indeed from a purely mechanical point of view, bridges and trees are very similar: they are structures which are built in stages, they are made of several materials (composite structures), their materials are prestressed (wood is prestressed during the maturation process as a result of polymerisation of lignin and cellulose to form the secondary cell wall and concrete is prestressed during drying). Simulations gave evidence that the reorientation process of axes can be significantly influenced by the kinetics of maturation. Moreover the model has now to be tested with more experimental data of wood viscoelasticity but it appears that in the range of a relaxation time from 0 to 50 days, viscoelasticity has an important effect on the evolution of tree shape as well as on the values of prestresses.
DOI: 10.1016/j.jtbi.2010.12.027
PubMed: 21187101
Affiliations:
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(physiologie)</term><term>Modèles biologiques (MeSH)</term><term>Populus (croissance et développement)</term><term>Populus (physiologie)</term><term>Simulation numérique (MeSH)</term><term>Viscosité (MeSH)</term><term>Élasticité (MeSH)</term></keywords><keywords scheme="MESH" qualifier="croissance et développement" xml:lang="fr"><term>Arbres</term><term>Populus</term></keywords><keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Populus</term><term>Trees</term></keywords><keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Arbres</term><term>Bois</term><term>Gravitropisme</term><term>Module d'élasticité</term><term>Populus</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Elastic Modulus</term><term>Gravitropism</term><term>Populus</term><term>Trees</term><term>Wood</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Computer Simulation</term><term>Elasticity</term><term>Kinetics</term><term>Models, 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For axes in which elongation is achieved but cambial growth active, the tropic movements are due to the production of a particular wood, called reaction wood which is prestressed within the growing tree. Several models have been developed to simulate the gravitropic response of axes in trees due to the formation of reaction wood, all within the frame of linear elasticity and considering the wood maturation as instantaneous. The effect viscoelasticity of wood has, to our knowledge, never been considered. The TWIG model presented in this paper aims at simulating the gravitropic movement of a tree axis at the intra-annual scale. In this work we studied both the effect of a non-instantaneous maturation process and of viscoelasticity. For this purpose, we considered the elastic case with maturation considered as an instantaneous process as the reference. The introduction of viscoelasticity in TWIG has been done by coupling TWIG to a model developed for bridges. Indeed from a purely mechanical point of view, bridges and trees are very similar: they are structures which are built in stages, they are made of several materials (composite structures), their materials are prestressed (wood is prestressed during the maturation process as a result of polymerisation of lignin and cellulose to form the secondary cell wall and concrete is prestressed during drying). Simulations gave evidence that the reorientation process of axes can be significantly influenced by the kinetics of maturation. Moreover the model has now to be tested with more experimental data of wood viscoelasticity but it appears that in the range of a relaxation time from 0 to 50 days, viscoelasticity has an important effect on the evolution of tree shape as well as on the values of prestresses.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">21187101</PMID><DateCompleted><Year>2011</Year><Month>05</Month><Day>25</Day></DateCompleted><DateRevised><Year>2011</Year><Month>02</Month><Day>15</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1095-8541</ISSN><JournalIssue CitedMedium="Internet"><Volume>273</Volume><Issue>1</Issue><PubDate><Year>2011</Year><Month>Mar</Month><Day>21</Day></PubDate></JournalIssue><Title>Journal of theoretical biology</Title><ISOAbbreviation>J Theor Biol</ISOAbbreviation></Journal><ArticleTitle>TWIG: a model to simulate the gravitropic response of a tree axis in the frame of elasticity and viscoelasticity, at intra-annual time scale.</ArticleTitle><Pagination><MedlinePgn>115-29</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1016/j.jtbi.2010.12.027</ELocationID><Abstract><AbstractText>Trees are able to maintain or modify the orientation of their axes (trunks or branches) by tropic movements. For axes in which elongation is achieved but cambial growth active, the tropic movements are due to the production of a particular wood, called reaction wood which is prestressed within the growing tree. Several models have been developed to simulate the gravitropic response of axes in trees due to the formation of reaction wood, all within the frame of linear elasticity and considering the wood maturation as instantaneous. The effect viscoelasticity of wood has, to our knowledge, never been considered. The TWIG model presented in this paper aims at simulating the gravitropic movement of a tree axis at the intra-annual scale. In this work we studied both the effect of a non-instantaneous maturation process and of viscoelasticity. For this purpose, we considered the elastic case with maturation considered as an instantaneous process as the reference. The introduction of viscoelasticity in TWIG has been done by coupling TWIG to a model developed for bridges. Indeed from a purely mechanical point of view, bridges and trees are very similar: they are structures which are built in stages, they are made of several materials (composite structures), their materials are prestressed (wood is prestressed during the maturation process as a result of polymerisation of lignin and cellulose to form the secondary cell wall and concrete is prestressed during drying). Simulations gave evidence that the reorientation process of axes can be significantly influenced by the kinetics of maturation. Moreover the model has now to be tested with more experimental data of wood viscoelasticity but it appears that in the range of a relaxation time from 0 to 50 days, viscoelasticity has an important effect on the evolution of tree shape as well as on the values of prestresses.</AbstractText><CopyrightInformation>Copyright © 2011 Elsevier Ltd. 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DateType="Electronic"><Year>2010</Year><Month>12</Month><Day>25</Day></ArticleDate></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>J Theor Biol</MedlineTA><NlmUniqueID>0376342</NlmUniqueID><ISSNLinking>0022-5193</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D003198" MajorTopicYN="Y">Computer Simulation</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D055119" MajorTopicYN="N">Elastic Modulus</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D004548" MajorTopicYN="Y">Elasticity</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D018522" MajorTopicYN="N">Gravitropism</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D007700" 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uniqKey="Coutand C" first="Catherine" last="Coutand">Catherine Coutand</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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