Abstract Detail
Developmental and Structural Section Lintilhac, Philip [1], Wei, Chunfang [1]. Loss of Stability: a New Model for Turgor-driven Cell Wall Extension Growth. WE have investigated the possibility of replacing Preston and Probine’s well known and oft-quoted creep/viscoelasticity-based model for cell wall stress-relaxation with a newer and more predictive model based on the concept of Loss of Stability. This model, derived from physical first principles, permits the prediction of the working turgor pressure for any growing plant cell for which the geometry, wall thickness, and wall modulus are known. Our model eliminates the experimental inconsistencies inherent in the viscoelastic/creep model which requires non-physiological, sudden loading to demonstrate the viscoelastic properties of cell wall materials. Our model makes it possible to define a "Critical Pressure" (Pcr) for cell wall stress relaxation. It differs from the older "Yield Threshold" model because turgor pressures can never exceed Pcr. This implies that turgor pressures in growing plant cells must necessarily be hovering at or near to their critical pressures. The relationship between increasing pressure, wall instability and cell wall stress relaxation also implies that localized biophysical factors determine local cell wall behavior.
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Related Links:
Loss of Stability - Jnl of Theor. Biol.
Loss of stability, pH, and the anisotropic extensibility of Chara cell walls
1 - University of Vermont, Department of Botany & Agbiochem, Burlington, Vermont, 05405-0086, USA
Keywords:
cell expansion
Chara.
Presentation Type: Oral Paper:Papers for Sections
Session: 65-1
Location: 303/Bell Memorial Union
Date: Wednesday, August 2nd, 2006
Time: 8:00 AM
Abstract ID:760 | 