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Effects of Tetramethylthiuram Disulfide on Metabolism of Fusarium roseum

Hugh D. Sisler and Carroll E. Cox
American Journal of Botany
Vol. 41, No. 4 (Apr., 1954), pp. 338-345
Stable URL: http://www.jstor.org/stable/2438608
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Tetramethylthiuram Disulfide on Metabolism of Fusarium roseum
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Abstract

An exogenous source of inorganic nutrients and of a respirable carbon compound was necessary for germination and growth of washed conidia of Fusarium roseum Lk. Conidia in distilled water or in a basal inorganic medium had a low, relatively constant rate of endogenous respiration. Soon after addition of glucose to conidia there was a many-fold increase in the rate of oxygen uptake. Tetramethylthiuram disulfide at concentrations of 10-4, 10-3, and 10-2 moles/l. inhibited respiration of glucose by conidia of this fungus and inhibited their germination. The higher concentrations had a greater effect upon oxygen uptake than lower concentrations, and their effectiveness in inhibiting germination was maintained for a longer time. Fermentation of glucose in an atmosphere of nitrogen was also inhibited. The fungicide was decomposed in the presence of living fungus cells with the release of a volatile toxicant which also inhibited respiration and germination. Carbon disulfide was identified in the atmosphere over liquid media containing fungus cells and the fungicide.

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