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It was previously(1) reported that the bacteriophage MT developed plaques of larger size on Salmonella pullorum than on Salmonella typhi, and its mechanism was considered and discussed. This bacteriophage is able to infect Salmonella anatum; and in this case, its plaques are unusually turbid, with a kind of secondary plaques in confluently lyzed turbid plaques. The present paper is going to deal with the mechanism of these phenomena, namely development of turbid plaques and formation of secondary plaques. It is well known that there are many kinds of plaques in respect of their morphology. There are many varieties of plaque size. Some phages produce plaques with halo, while others without halo. Plaques are usually round, but some have a rugged margin. As far as we know, there have been scarce inf ormations about the mechanisms of these morphological variations in phage plaques. When recombination between two related bacteriophages is studied, the plaque morphology has been one of the most important characteristics to mark, and yet the basic explanation of the plaque morphology is still largely obscure. In this respect, analysis of plaque morphogenesis may present an important problem for genetic study of the bacteriophage. We have already made some analyses for plaque size and pointed out two factors which may influence upon it, namely latent period (2) of one-step growth and generation time(1) of host cells. Discussion was also previously made of the development of turbid plaques on a mixed culture of the corresponding host and its resistant mutant(3).

ON THE MECHANISM OF APPEARANCE OF THE TURBID PLAQUES PRODUCED BY THE PHAGE MT ON SALMONELLA ANATUM