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Inhibition of Normal Pigment Synthesis in Spores of Dictyostelium purpureum

William F. Whittingham and Kenneth B. Raper
American Journal of Botany
Vol. 43, No. 9 (Nov., 1956), pp. 703-708
Stable URL: http://www.jstor.org/stable/2438836
Page Count: 6
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Inhibition of Normal Pigment Synthesis in Spores of Dictyostelium purpureum
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Abstract

Phenol concentrations of 10-2 M to 5 x 10-1 M induced the formation of white sori in cultures of Dictyostelium purpureum. This change in sorus color could not be attributed to a pH phenomenon, but rather, it is believed to result from an inhibition of the enzymatic sequence in pigment synthesis. Three additional compounds, m-cresol, p-cresol, and resorcinol, were found to induce effects similar to those induced by phenol. The minimum concentrations required to duplicate these effects were the same for all four compounds, suggesting that their modes of action were similar, if not identical. The relationship of this phenomenon to speciation in the Acrasieae is also discussed.

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