Morphological Mutants of Escherichia coli. Isolation and Ultrastructure of a Chain-forming envC Mutant

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Abstract
Non-conditional morphological mutant envC derived from Escherichia coli K- I 2 strain ~678, isolated after treatment with I-methyl-3-nitro- I -nitrosoguanidine, produced chains of bacteria on synthetic or rich media at 30 "C and 40 "C. It was sensitive to deoxycholate and less resistant to penicillin and rifampicin than the parent strain. In section under the electron microscope, the mutant showed greatly disorganized septum formation. Preliminary mapping of envC by conjugation located it near xyl. The morphological and physiological characteristics of eniC+ recombinants and the envC+ parent were identical.

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