Abstract
The mycelium of Fusarium oxysporum f. sp. raphani produces two types of biologically active-volatile metabolites. The one, inhibitory to the chlamydospore germination, is produced under the lack of available carbon sources. The other metabolites, which counteract the activity of the former, were produced under the presence of 30-100mM of glucose, and these were identified to be ethanol and acetaldehyde by gas chromatography. The inhibition of chlamydospore germination was also counteracted when chlamydospore suspension was exposed to the gas which was released from 0.1mM ethanol solution, or 10mM acetaldehyde solution. The concentration of ethanol produced by glucose-supplied mycelium was enough to counteract the inhibition, but that of acetaldehyde was insufficient. The volatile metabolites produced by glucose-supplied mycelium, ethanol and acetaldehyde, also counteracted the inhibition caused by a volatile inhibitor from soil. The possible mechanism of regulation of chlamydospore germination by parent mycelium is discussed.
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