Protocol for mapping the variability in cell wall mechanical bending behavior in living leaf pavement cells

Area of Science:

• Plant Biology
• Biophysics
• Cell Biology

Background:

• Cell morphogenesis is influenced by mechanical properties, size, geometry, and turgor pressure.
• Accurate computational models of cell growth require validated wall elastic modulus and turgor pressure values.
• Few experiments validate models by deforming the entire cell wall thickness, necessary for quantifying developmental changes.

Purpose of the Study:

• To quantitatively analyze variations in elastic bending behavior of the primary cell wall in living Arabidopsis pavement cells.
• To measure turgor pressure within cells under varying osmotic conditions.
• To develop an integrated experimental-computational approach for plant cell wall analysis.

Main Methods:

• Utilized laser scanning confocal microscopy to capture 3D cell geometry.
• Performed indentation experiments to assess local mechanical responses of the periclinal wall.
• Employed a finite element model iteratively matched with experimental data to determine mechanical properties and turgor pressure.

Main Results:

• Determined a non-uniform distribution of the elastic modulus along the periclinal wall of Arabidopsis leaf cells.
• Confirmed that plant cell walls exhibit heterogeneous organization.
• Quantitatively predicted the magnitude and orientation of cell wall stress.

Conclusions:

• The developed integrated approach accurately measures cell wall properties and turgor pressure.
• The findings highlight the heterogeneity and anisotropy of plant cell walls.
• This method provides a reference for future studies on plant cell morphogenesis.