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Radiolabeled phage SPO2 fragments were tested for the abiity to form interspecies deoxyribonucleic acid (DNA) duplexes with DNA from Bacillus subtilis and from phages beta3 and beta22. No reassociation, above control values, occurred between the DNA of phage SPO2 and that of its host or either of the virulent B. subtilis phages. It appears that extensive nucleotide sequence similarities between portions of host and phage DNA species are not necessary for the formation of the lysogenic state. The thermal elution profile of reassociated SPO2 DNA exhibited a normal distribution, indicating no heterogeneity in base composition. This differs from temperate enterophages whose DNA molecules contain regions of differing base composition.

Lack of Nucleotide Sequence Relationship Among the Temperate Bacteriophage SPO2, Bacillus subtilis , and Virulent Bacteriophages β3 and β22