Auxin gradients are associated with polarity changes in trees.
Identifieur interne : 003855 ( Main/Curation ); précédent : 003854; suivant : 003856Auxin gradients are associated with polarity changes in trees.
Auteurs : Eric M. Kramer [Royaume-Uni] ; Michael Lewandowski ; Satvik Beri ; Jessica Bernard ; Matthew Borkowski ; Michael H. Borkowski ; Laura Ann Burchfield ; Brenda Mathisen ; Jennifer NormanlySource :
- Science (New York, N.Y.) [ 1095-9203 ] ; 2008.
Descripteurs français
- KwdFr :
- MESH :
- croissance et développement : Populus.
- cytologie : Bois, Méristème, Populus.
- métabolisme : Acides indolacétiques, Méristème, Populus.
- Modèles biologiques, Polarité de la cellule, Simulation numérique.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Indoleacetic Acids.
- cytology : Meristem, Populus, Wood.
- growth & development : Populus.
- metabolism : Meristem, Populus.
- Cell Polarity, Computer Simulation, Models, Biological.
Abstract
Models of plant growth and development propose that changes in cell polarity are mediated by gradients of the plant hormone auxin. With use of gas chromatography-mass spectrometry, we measured the redistribution of endogenous auxin in stems of quaking aspen trees (Populus tremuloides) after wounding. Persistent (lasting at least 24 hours) auxin gradients were observed in the region of the cambium where cell polarity was changing. A computer model of the auxin redistribution shows agreement with measured concentrations.
DOI: 10.1126/science.1156130
PubMed: 18566279
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pubmed:18566279Le document en format XML
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<country xml:lang="fr">Royaume-Uni</country>
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<author><name sortKey="Bernard, Jessica" sort="Bernard, Jessica" uniqKey="Bernard J" first="Jessica" last="Bernard">Jessica Bernard</name>
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<term>Meristem (cytology)</term>
<term>Meristem (metabolism)</term>
<term>Models, Biological (MeSH)</term>
<term>Populus (cytology)</term>
<term>Populus (growth & development)</term>
<term>Populus (metabolism)</term>
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<keywords scheme="KwdFr" xml:lang="fr"><term>Acides indolacétiques (métabolisme)</term>
<term>Bois (cytologie)</term>
<term>Modèles biologiques (MeSH)</term>
<term>Méristème (cytologie)</term>
<term>Méristème (métabolisme)</term>
<term>Polarité de la cellule (MeSH)</term>
<term>Populus (croissance et développement)</term>
<term>Populus (cytologie)</term>
<term>Populus (métabolisme)</term>
<term>Simulation numérique (MeSH)</term>
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<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Indoleacetic Acids</term>
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<term>Populus</term>
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<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Meristem</term>
<term>Populus</term>
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<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Acides indolacétiques</term>
<term>Méristème</term>
<term>Populus</term>
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<term>Computer Simulation</term>
<term>Models, Biological</term>
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<front><div type="abstract" xml:lang="en">Models of plant growth and development propose that changes in cell polarity are mediated by gradients of the plant hormone auxin. With use of gas chromatography-mass spectrometry, we measured the redistribution of endogenous auxin in stems of quaking aspen trees (Populus tremuloides) after wounding. Persistent (lasting at least 24 hours) auxin gradients were observed in the region of the cambium where cell polarity was changing. A computer model of the auxin redistribution shows agreement with measured concentrations.</div>
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