Trees feel mechanical strain: from genes expression to cambium activity modulation - Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier Accéder directement au contenu
Communication Dans Un Congrès Année : 2013

Trees feel mechanical strain: from genes expression to cambium activity modulation

Résumé

Mechanical signals are important factors that control plants growth and development. External mechanical loadings, such as wind, lead to a decrease of primary growth, an increase of secondary growth, modifications of stem mechanical properties and biomass reallocation to roots. Biomechanical studies on tomato and poplar demonstrated that tissue strains are sensed by plants (Coutand and Moulia 2000 ; Coutand, Martin et al., 2009). An integrative biomechanical model (S3m) has been developed. This model supposes that mecanoperception at competent cells scale is proportional to local strain and volume of the considered tissue (Moulia et al., 2011). In nature, mechanical stimuli do not occur as a single bending. In order to understand how plants acclimate to strain induced by wind, we have studied, on young poplars, the effect of successive bending separated at day scale, mimicking the alternation between windy or quiet weather. Our results show, as soon as a second bending was applied, a diminution of the secondary growth rate. Simultaneously, molecular responses to subsequent bending were observed. Trees acclimated rapidly to mechanical loadings and a desensitization period of a few days occurred after a single transitory bending (Martin et al., 2010). Stem anatomical observations showed that, in response to bending, cambium activity was locally impacted by the strain. The secondary growth rate was identically stimulated according to the strain level both in the stretched part and in the compressed part of the stem. However, wood differentiation appeared to be modulated according to the sign of mechanical loading (tension or compression).
Fichier principal
Vignette du fichier
2013_Martin_Poster_Naples_1.pdf (18.63 Mo) Télécharger le fichier
2013_Martin_Resume_Naples_2.pdf (53.1 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-01190306 , version 1 (06-06-2020)

Identifiants

  • HAL Id : hal-01190306 , version 1
  • PRODINRA : 191048

Citer

Eric Badel, Ludovic Martin, Nathalie Leblanc-Fournier, Jean-Louis J.-L. Julien, Catherine Coutand, et al.. Trees feel mechanical strain: from genes expression to cambium activity modulation. International Symposium on Wood Structure in Plant Biology and Ecology, Apr 2013, Naples, Italy. ⟨hal-01190306⟩
81 Consultations
13 Téléchargements

Partager

Gmail Facebook X LinkedIn More