Abstract Detail
Cell Walls Wei, Chunfang [1], Lintilhac, Philip [2]. Loss of Stability: a New Model for Turgor-driven Cell Wall Extension Growth in cylindrical plant cells. We propose replacing Preston and Probine’s well known creep/viscoelasticity-based model for cell wall stress-relaxation with a newer and more predictive model based on the concept of Loss of Stability in a cylindrical pressure-vessel. This model, derived from physical first principles, permits the prediction of working turgor pressure for any cylindrical plant cell for which cell geometry, wall thickness, and wall modulus are known. Our model eliminates the experimental inconsistencies inherent in the viscoelastic/creep model which requires sudden loading to demonstrate the viscoelastic properties of cell wall materials. Our model makes it possible to define a discrete threshold for cell wall stress relaxation as turgor pressure rises gradually to a critical pressure level (Pcr) and 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 suggests that cell growth is a self-limiting behavior and that localized biophysical factors determine local cell wall deformation.
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Related Links:
Underlying theory
Loss of Stability
1 - The University of Vermont, Dept of Plant Biology
2 - The University of Vermont, Dept of Plant Biology, Marsh Life Science Bldg., Burlington, VT, 05405, USA
Keywords:
Cell enlargement
Stress relaxation
Turgor pressure
growth
cell wall.
Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P17009
Abstract ID:265 | 