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Actin Localization during Fucus Embryogenesis
D. L. Kropf1, S. K. Berge, R. S. Quatrano
1Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon 97331.
The Plant Cell
|February 1, 1989
Summary
Actin microfilaments are crucial for establishing developmental polarity in Fucales embryos. Their localization at the germination site, sensitive to cytochalasin, supports their role in axis fixation during early embryogenesis.
Area of Science:
- Developmental Biology
- Cell Biology
- Marine Botany
Background:
- Fucales embryogenesis is a model for studying cellular and developmental polarity acquisition.
- Fertilized Fucales eggs develop asymmetry, forming a developmental axis within 16 hours for zygote germination.
Purpose of the Study:
- To investigate the role of microfilaments (actin) in establishing the developmental axis in Fucales.
- To determine the localization and dynamics of actin during axis fixation.
Main Methods:
- Immunoblotting to quantify cellular actin content.
- Rhodamine phalloidin staining to visualize F-actin localization.
- Treatment with cytochalasins to assess the role of actin in axis fixation.
Main Results:
- Three actin isoforms were detected in constant amounts throughout development.
- Actin networks were initially uniform but localized to the presumptive germination site during axis fixation.
- This localization was sensitive to cytochalasin, indicating microfilament involvement.
Conclusions:
- Actin microfilaments play a critical role in the fixation of the developmental axis in Fucales.
- Axis fixation likely involves the stabilization of membrane components via transmembrane bridges connecting the cell wall to the actin cytoskeleton.