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Statut |
Confirmé |
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Série |
LPS/ENS |
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Domaines |
physics |
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Date |
Mercredi 2 Fevrier 2011 |
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Heure |
11:00 |
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Institut |
LPS/ENS |
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Salle |
Conf IV |
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Nom de l'orateur |
Abkarian |
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Prenom de l'orateur |
Manouk |
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Addresse email de l'orateur |
manouk [dot] abkarian [at] um2 [dot] fr |
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Institution de l'orateur |
Laboratoire Charles Coulomb, UM2 Montpellier |
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Titre |
Folding Instabilities as a Mechanism for Leaf Venation |
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Résumé |
The venation pattern of leaves is generally interpreted in biochemical terms involving the diffusion of
hormones. Detailed investigations, however, demonstrate the shortcomings of this mechanism. Nevertheless,
the resemblance of the network of veins with crack patterns suggests that a stress-related process
could be the controlling mechanism. To test this hypothesis, we use a layered elastic film under equibiaxial
compression, which mimics the effect of tissue growth. We find that repetitive folding instabilities
produce a hierarchical network by local reorganization of the stress field. The resulting network shares
geometric properties with venation patterns and reproduces features of leaf margins as well as striation
patterns of monocotyledons. We discuss how the stress- release mechanism offered by folding could
guide cell differentiation and its possible location in the leaf tissue. |
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Numéro de preprint arXiv |
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