Marinomonas mediterranea is a lysogenic bacterium that synthesizes R-bodies Hernández-Romero, Diana and Lucas-Elío, Patricia and López-Serrano, Daniel and Solano, Francisco and Sanchez-Amat, Antonio,, 149, 2679-2686 (2003), doi = https://doi.org/10.1099/mic.0.26524-0, publicationName = Microbiology Society, issn = 1350-0872, abstract= The melanogenic marine bacterium Marinomonas mediterranea synthesizes R-bodies as revealed by transmission electron microscopy. These structures were previously described in some obligate symbionts of paramecia and some free-living bacteria, none of which was isolated from sea water. In other micro-organisms, the synthesis of R-bodies has been related to extrachromosomal elements. Accordingly, M. mediterranea induction by mitomycin C or UV radiation resulted in the production of defective phages resembling bacteriocins, indicating that it is a lysogenic bacterium. Two mitomycin-C-resistant strains defective in prophage replication have been isolated. These mutants, and the previously obtained strains ngC1, T102 and T103, the latter mutated in the ppoS gene encoding a sensor histidine kinase, are affected not only in phage replication but also in polyphenol oxidase activities and melanin synthesis, suggesting a relationship between the control of all these processes., language=, type=