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Studies of the developmental steps in the cell cycle of Caulobacter crescentus have involved the isolation of non-motile mutants (Kurn et al., 1974) and mutants resistant to phage q5CbK (Agabian-Keshishian & Shapiro, 1971), to the flagellotropic phage q5Cp34 and to the RNA phage $Cp2 which is thought to adsorb to pili (Fukuda et al., 1976). Kurn et a/. (1974) reported the isolation of a non-motile mutant which had lost sensitivity to phage q5Cb5, a pilus-specific phage, and q5CbK. A motile revertant of this mutant was shown to have regained phage sensitivity. Fukuda et al. (1976) isolated mutants resistant to either phage q5CbK or q5Cp34 or q5Cp2. Many of these mutants showed pleiotropic loss of sensitivity to all three phages and/or loss of motility. Some motile revertants of a number of these non-motile phage resistant mutants were shown to have simulaneously regained wild-type phage sensitivities. On the basis of the pleiotropic phenotypes of these mutants and of the phenotypes of the revertants isolated, Fukuda et al. (1976) suggested that the synthesis of flagella, pili and phage q5CbK receptor sites can be inhibited by a single mutation and that the expression of these surface structures is under a common control mechanism. This communication reports studies on phage q5CbK resistant strains of C. crescentus CB 1 5 isolated either after N-methylN'-nitro-N-nitrosoguanidine (NTG) mutagenesis or as spontaneous mutants.

A Study of Spontaneous and N-Methyl-N'-nitro-N-nitrosoguanidine-induced Phage Resistant Mutants in Caulobacter crescentus