SUMMARY: The gas mixtures from cultures of inhibited growth and sporulation of and germination of seeds of In test conditions seven volatile organic metabolites in the culture gases were identified by gas-liquid chromatography (GLC) as acetaldehyde, ethyl acetate, ethanol, -propanol, isobutanol, and a mixture of isopentanols (1 part 2-methyl-butan-1-ol to 2 parts 3-methyl-butan-1-ol); changes in the concentrations of CO and O were also measured. Pure samples of each of these components were tested at the concentrations found in the culture gases in order to identify the inhibitory substances.

Inhibition of growth of could be produced by these culture gas concentrations of acetaldehyde and of ethanol. Inhibition by this concentration of CO was just significant in these tests. The effect on sporulation could be produced by the CO, but not by these concentrations of any of the other identified components.

The effect of seed germination could be produced by these culture gas concentrations of ethanol and of 3-methyl-butan-1-ol to a lesser extent. Slight effects were also observed with a lowered O concentration and with a raised CO concentration but not with the other constituents.


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