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Cell growth pattern and wall microfibrillar arrangement: experiments with nitella.
1Department of Biological Sciences, Stanford University, Stanford, California 94305.
Plant Physiology
|August 1, 1977
Summary
Cell wall microfibrils guide plant cell growth. This study shows that while strain is necessary for oriented synthesis, it doesn't continuously direct microfibril orientation in growing Nitella cells.
Area of Science:
- Plant Biology
- Cell Biology
- Biophysics
Background:
- Cell elongation in plants relies on transverse reinforcement by microfibrils.
- The multinet theory explains microfibril reorientation during cell growth due to strain.
Purpose of the Study:
- To investigate the role of physical strain in directing microfibril orientation during cell wall synthesis.
- To test the validity of the multinet theory under abnormal growth conditions.
Main Methods:
- Young Nitella cells were subjected to forced growth patterns (length-only, girth-only, localized growth suppression).
- Microfibrillar arrangement gradients were measured using polarized light and interference microscopy.
Main Results:
- Observed novel wall structures were consistent with passive reorientation predicted by the multinet theory.
- Microfibril synthesis orientation remained largely unaffected by most physical manipulations.
- Complete suppression of surface growth induced non-transverse cellulose deposition.
Conclusions:
- Strain is essential for sustained oriented microfibril synthesis in plant cell walls.
- The direction of strain does not continuously guide synthesis orientation after initial establishment.
- Passive reorientation is a key mechanism in plant cell wall development.