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The pheromone receptor specificity and threshold concentrations have been determined for spermatozoid chemotaxis in Laminaria digitata in structure-activity studies. The results are in agreement with the current concept on the pheromone receptor interaction in brown algae, which is based on mutually-induced dipole-dipole interaction, dispersion forces and hydrophobic forces. Comparison with the receptor specificity in pheromone-induced spermatozoid release in the same species indicates that different pheromone receptors are involved in these two functions.

Spermatozoid Chemotaxis in Laminaria digitata (Phaeophyceae). III. Pheromone Receptor Specificity and Threshold Concentrations