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Poster De Conférence Année : 2015

A universal mechanism for hydraulic signals generation in natural and artificial branches

Résumé

Plants are constantly subjected to external mechanical loads such as wind, rain or even neighbours. These stimuli are known to affect the growth of the plants, a process called thigmomorphogenesis (Jaffe et al. 2002, Braam 2005, Telewski 2006). Typically, the bending of a tree stem leads to a local increase of the radial growth while the primary growth is rapidly stopped, suggesting a transport of the information from the stimulated zone to the apical zone (Coutand et al. 2000, 2009). Among the different hypothesis found in the literature to account for this long-distance transport (electrical signal, hormone transport), it has been proposed that local mechanical stimuli, like bending, could generate a hydraulic signal that could move through the xylem (Malone 1994, Julien 1993, Farmer et al 2014). Recently, such hydro/mechanical couplings have been directly observed by Lopez et al (2014), who showed that bending a whole living tree or a cut branch generates almost simultaneously an overpressure pulse in the vascular system. However, the physical mechanism responsible for this hydro/mechanical coupling and the basic properties of the hydraulic pulse (amplitude vs. bending deformation, dependence with wood properties) remained not understood.
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Dates et versions

hal-01269522 , version 1 (05-02-2016)

Identifiants

  • HAL Id : hal-01269522 , version 1
  • PRODINRA : 343728

Citer

Jean-François Louf, G. Guena, Eric Badel, Yoel Forterre. A universal mechanism for hydraulic signals generation in natural and artificial branches. 8th Plant Biomechanics International Conference, Nov 2015, Nagoya, Japan. Nagoya University, Proceedings of the Plant Biomechanics Conference, 253 p., 2015, Plant Biomechanics International Conference. ⟨hal-01269522⟩
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