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J Virol. 1969 July; 4(1): 47-49
Copyright © 1969 American Society for Microbiology. All Rights Reserved.

Evidence that Bacillus subtilis Bacteriophage SPO2 is Temperate and Heteroimmune to Bacteriophage 105

Department of Zoology, University of California, Los Angeles, California 90024

ABSTRACT

Some characteristics of Bacillus subtilis phage SPO2 which show that it is a temperate phage are presented. Wild-type SPO2 forms turbid plaques, similar to those of other temperate phages. SPO2 lysogenic strains which are resistant to SPO2 can be isolated; these strains remain stable lysogens despite the fact that they can no longer adsorb SPO2. SPO2 lysogenic strains can be grown for many generations in SPO2 antiserum and remain lysogenic. Phage SPO2 plates on 105 lysogens and phage 105 plates on SPO2 lysogens; this indicates that SPO2 and 105 are heteroimmune. Phage 105 plates on an SPO2-resistant strain; this indicates that SPO2 and 105 adsorb to different receptor sites on the bacterial surface.