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Stained pectin as seen in the electron microscope.
The Journal of Biophysical and Biochemical Cytology
|October 1, 1960
Summary
This study visualizes pectin distribution in plant cells using electron microscopy. Pectin was localized in the middle lamella and primary wall, revealing its role in cell wall development.
Area of Science:
- Plant Cell Biology
- Biochemistry
- Microscopy
Background:
- Pectin is a crucial component of plant cell walls, influencing cell adhesion and structural integrity.
- Understanding pectin distribution is key to elucidating cell wall formation and plant development.
Purpose of the Study:
- To investigate the precise distribution of pectin within young plant cells using advanced electron microscopy techniques.
- To differentiate between various pectin fractions based on their location and solubility.
Main Methods:
- Electron microscopy was employed on dark-grown onion roots.
- Pectic substances were selectively stained using basic hydroxylamine and ferric ion complexation.
- Hot water and hot versene extractions were used to characterize pectin fractions.
Main Results:
- Dense iron deposits, indicating pectin presence, were observed in the middle lamella and near the primary wall surface.
- Pectin in immature transverse walls connected to the longitudinal wall's inner layer.
- Mature transverse wall pectin associated with middle lamella pectin.
Conclusions:
- Pectin distribution varies with cell wall maturity and location.
- Middle lamella pectin corresponds to the hot water-soluble fraction.
- Internal wall and transverse wall pectin represent the residual fraction, largely removed by versene extraction.
Keywords:
PECTINS