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The roseobacter group of marine bacteria is characterized by a mosaic distribution of ecologically important phenotypes. These are often encoded on mobile extrachromosomal replicons. So far, conjugation had only been experimentally proven between the two model organisms  Phaeobacter inhibens and  Dinoroseobacter shibae . Here, we show that two large natural RepABC-type plasmids from  D. shibae can be transferred into representatives of all known major  Rhodobacterales lineages. Complete genome sequencing of the newly established  Phaeobacter inhibens transconjugants confirmed their genomic integrity. The conjugated plasmids were stably maintained as single copy number replicons in the genuine as well as the new host. Co-cultivation of  Phaeobacter inhibens and the transconjugants with the dinoflagellate  Prorocentrum minimum  demonstrated that  Phaeobacter inhibens is a probiotic strain that improves the yield and stability of the dinoflagellate culture. The transconjugant carrying the 191 kb plasmid, but not the 126 kb sister plasmid, killed the dinoflagellate in co-culture.

Fatal affairs – conjugational transfer of a dinoflagellate-killing plasmid between marine Rhodobacterales