Abstract
The isolation of a temperature phage specific for the photosynthetic bacterium Rhodopseudomonas spheroides is reported. This phage, Rφ-1, establishes a state of lysogeny and can be induced from the prophage state by exposure to mitomycin C or UV irradiation. Mutants of Rφ-1 which grow on a standard laboratory strain (2.4.1) of Rhodopseudomonas spheroides were isolated. Although the original Rφ-1 isolated was chloroform sensitive, the mutant which plates on strain 2.4.1 is chloroform resistant. Rφ-1 does not grow on closely related bacteria, such as Rhodopseudomonas palustris or Rhodopseudomonas capsulata. Rφ-1 mutants forms plaques with the same efficiency whether the plates are incubated under aerobic conditions in the dark or under anaerobic conditions in the light (phototropic conditions).
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