1887

Abstract

SUMMARY: The properties of a conditional mutant of (Mir M7) are described. The mutant has a pH-dependent disturbance of morphology and a temperature-dependent disturbance of division. At pH 7 the mutant grows as cocci and at 41 °C (restrictive temperature) division is inhibited. At acid pH and restrictive temperature, filaments are formed. At pH 7 and permissive temperature, polymorphous cocci are obtained. At pH 7 and 41 °C, giant polymorphous cells are formed. The inhibition of division is phenotypically reverted by 0·05 -Mg, 0·1 -Na or 0·4 -sucrose. Seventeen revertants were isolated having exactly the same characteristics as the wild-type , so it seems that only one mutation is responsible for the different disturbances of the mutant. The possibility of membrane damage on which the morphology and division disturbances may depend is discussed.

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/content/journal/micro/10.1099/00221287-80-1-51
1974-01-01
2022-01-21
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