抄録
An early stage of developing eggs of the seaweed Fucus is summarized briefly. A Fucus egg, which is initially apolar, forms a rhizoid 12-14 hours after fertilization. After a latent period when no egg responds to external vectors, the polarity becomes sensitive to some external vectors as a unilateral light. Fucus eggs also tend to form rhizoids to each other when eggs are sufficiently close. As a probable mechanism to explain the rhizoid formation, an electrophoresis mechanism is mentioned in detail.
Based on a bridging activity of Ca2+ in the membrane formation, an appearance of sensitivity in Fucus eggs is understood as a kind of bifurction phenomenon far from equilibrium. The appearance of polarity influenced by neighboring eggs is also discussed in terms of a self-organization process through the increasing number of components.
