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SELECTIVE INHIBITION OF BLUE‐GREEN ALGAL GROWTH BY ETHIONINE AND OTHER AMINO ACID ANALOG 1 , 2

Some metabolic analogs, including azaguanine, azathymine, azauracil, caffeine, 4‐azaleucine, dl‐ethionine, and dl‐p‐fluorophenylanlanine, were examined for their ability to repress the multiplication of algae from natural aquatic sources grown in defined or semidefined media. dl‐ethionine, dl‐p‐fluorophenylalanine, and 4‐azaleucine, in that order, inhibited the multiplication of blue‐green but not other algal groups. The purine and pyrimidine analogs were not inhibitory. In chemically defined axenic media, dl‐ethionine was about 100 times more inhibitory to the blue‐green algae Synechococcus cedrorum and Anabaena cylindrica than to the eucaryotic algae Ochromonas danica and Euglena gracilis. The ciliate Tetrahymena pyriformis was at least 100‐fold more resistant to ethionine than the algae. The unusual sensitivity of blue‐green algae to ethionine and other amino acid analogs represents an exceptional phylelic character and may be useful in the control of these algae when they become a nuisance. Amino acid analogs such as ethionine may also serve to remove blue‐green algae from cultures one may desire to render axenic.