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Calcium is Necessary for Motility in the Diatom Amphora coffeaeformis¹

Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149

The marine diatom Amphora coffeaeformis required Ca²⁺ and bicarbonate for motility. Movement was inhibited by the Ca²⁺-blocking agents ruthenium red and -isopropyl--[(N-methyl-N-homoveratryl)-- aminopropyl]-3,4,5-trimethoxy phenyl acetonitrile and the metabolic energy uncoupler, carbonyl cyanide 3-chlorophenylhydrazone. 3-(3',4-Dichlorophenyl)-1,1-Dimethyl urea was without effect on cells at a concentration that prevented O₂ production in the light. Although Sr²⁺ could replace Ca²⁺ in the attachment of cells to glass, it did not substitute for Ca²⁺ in motility.