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Biol Bull 78: 407-411. (June 1940)
© 1940 Marine Biological Laboratory
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THE EFFECT OF ALKALINITY UPON MUTUAL INFLUENCES DETERMINING THE DEVELOPMENTAL AXIS IN FUCUS EGGS

D. M. WHITAKER 1 and E. W. LOWRANCE 1

1 From the Department of Biology, Stanford University

1. When two eggs of Fucus furcatus develop in the dark within 0.3-4 egg diameters of each other, the point of rhizoid origin and the developmental axis are influenced by the presence of the neighbor.

2. When the pH of the medium is below approximately 7.6, the rhizoids tend to form on the sides of the eggs toward the neighbor. When it is above 7.6, they tend to form on the sides away from the neighbor, most markedly at pH 8.4.

3. The effect is stronger the closer the eggs, within the limits 0.3-4 egg diameters.






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