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Sexual reproduction has a decisive function during the life cycle of all organisms. In the marine brown alga Cutleria multifida, multifidene (1), a low molecular weight olefinic hydrocarbon, has been recognized as a chemical messenger for gamete union. Comparative activity tests with 32 specially designed synthetic analogous of the natural attractant demonstrate the high specifity and low threshold concentration (6.5 × 10 -12  mol/L) of the gamete’s receptor system toward its natural signal (1). The findings establish the double bonds of multifidene (1) as the molecular coordination points in the messenger-receptor interaction. A tentative model is presented, which takes into account the evidence, that unpolar, but highly polarizable functional groups in the correct spatial arrangement are necessary for maximal mutual interaction

Receptor Specificity and Threshold Concentration in Chemotaxis of the Phaeophyte Cutleria multifida