Printed in Great Britain 295 Bacteriocinogeny and Lysogeny in the Genus Pseudomonas

Bacteriocinogeny and lysogeny have been investigated in strains of Pseudomonas aeruginosa, P.Jluorescens and P. ovalis. The 39 strains of P. aeruginosa were all bacteriocinogenic and 32 were also lysogenic. No bacteriocine production was detected in 8 strains of P. Jluorescens, although 3 were lysogenic. The one strain of P. ovalis studied was neither bacterio-cinogenic nor lysogenic for P. aeruginosa or P. Jluorescens. Typing of the bacteriocines of P. aeruginosa on the basis of their action spectra showed that 25 fall into four main groups; the bacteriocines of 6 strains could not be fitted into any definite group