Query: NC_010407:3174470 Clavibacter michiganensis subsp. sepedonicus chromosome, complete Lineage: Clavibacter michiganensis; Clavibacter; Microbacteriaceae; Actinomycetales; Actinobacteria; Bacteria General Information: Causative agent of bacterial ring rot. Isolated from infected potato. This organism was first described and classified in 1914 as "Bacterium sepedonicus" and is considered a major plant pathogen. It is a phytopathogenic actinomycete that causes wilt and tuber rot in potato, which is a plant vascular disease with very high bacterial titers. Pathogenicity is believed to be associated with the presence of two plasmids, pCSL1 and pCSL2. This species is subdivided into five subspecies: michiganensis, sepedonicus, nebraskensis, tesselarius and insidiosus each of which infects specific hosts: tomato, potato, corn, wheat and alfalfa, respectively. Members of the Clavibacter genus are known to produce antimicrobial compounds.
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General Information: This strain was isolated from a culture of the dinoflagellate Pfiesteria piscicida CCMP1830 which has been implicated in many large scale algal blooms resulting in increased mortality in fish. The bacteria are attached to the surface of the dinoflagellate and in some ways allow the dinoflagellate to grow as those lacking the bacteria die off. The bacterium also chemotaxes towards the dinoflagellate product DMSP (dimethylsulfoniopropionate) and metabolizes it. DMSP is a major source of sulfur in marine ecosystems and plays a role in the sulfur biogeochemical cycle. The implication is a tight association between these important dinoflagellates and this marine bacterium.