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The effects of various carbon sources and of antibiotics on the morphology of hypha cells of the fungus Ustilago cynodontis is described. Nonfermentable substrates promote readily reversible yeastlike colonies from hypha cells: all the hypha cells spread on these substrates give rise to yeastlike colonies that revert to the mycelial phenotype when transferred to glucose medium. Among the antibiotics tested, chloramphenicol (CAP) is found to promote, under certain circumstances, a long-lasting, even permanent modification on the morphology of the colonies: the colonies developed on CAP-glucose media are yeastlike, and a percentage of them give rise to colonies whose morphology remains yeastlike even on drug-free media: this effect is also obtained with cells cultivated in liquid medium. This permanent morphological modification is accompanied by a change of metabolic properties. Similar permanent effects are obtained with ethidium bromide, suggesting that mitochondrial functioning is involved in these modifications.

the journal of cell biology/the journal of cell biology

Reversible and permanent effects of the carbon sources and various antibiotics on the morphology and metabolic properties of Ustilago cynodontis cells.