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International Journal of Systematic and Evolutionary Microbiology, Vol 50, 1833-1847, Copyright © 2000 by Society for General Microbiology
R Rippka, T Coursin, W Hess, C Lichtle, DJ Scanlan, KA Palinska, I Iteman, F Partensky, J Houmard and M Herdman
Unite de Physiologie Microbienne (CNRS URA 1129), Departement de Biochimie et Genetique Moleculaire, Institut Pasteur, 28 Rue du Dr Roux, 75724 Paris Cedex 15, France
The formal description of Prochlorococcus marinus Chisholm et al. 1992, 299 was based on the non-axenic nomenclatural type, strain CCMP 1375(T). The purification and properties of the axenic strain PCC 9511, derived from the same primary culture (SARG) as the type species, are reported here. Prochlorococcus PCC 9511 differs from the latter in possessing horseshoe-shaped thylakoids, exhibiting a low chlorophyll b(2) content and lacking phycoerythrin, but shares these phenotypic properties with Prochlorococcus strain CCMP 1378. This relationship was confirmed by 16S rRNA sequence analyses, which clearly demonstrated that the axenic isolate is not co-identic with the nomenclatural type. Strain PCC 9511 has a low mean DNA base composition (32 mol% G+C) and harbours the smallest genome of all known oxyphotobacteria (genome complexity 1.3 GDa=2 Mbp). Urea and ammonia are the preferred sources of nitrogen for growth, whereas nitrate is not utilized. Several different organic phosphorus compounds efficiently replace phosphate in the culture medium, indicative of ecto-phosphohydrolase activity. In order to distinguish strain PCC 9511 from the nomenclatural type, a new subspecies is proposed, Prochlorococcus marinus Chisholm et al. 1992 subsp. pastoris subsp. nov.
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