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NOTES: Base Composition of DNA from Selected Strains of the Cyanobacterial Genus Microcystis

¹Department of Biology and Microbiology, University of Wisconsin at Oshkosh, Oshkosh, Wisconsin 54901
²Department of Plant Pathology, University of Wisconsin at Madison, Madison, Wisconsin 53715

^* Corresponding author.

ABSTRACT

Average DNA base compositions, as determined from 50% thermal denaturation temperatures and from buoyant densities, were 38, 41, 43, and 40 to 41 mol% G+C for Microcystis sp. strains P1-15, C5-34, AK1-6, and C3-40, respectively. These phenotypically similar organisms, which are representatives of the Microcystis cluster within the Synechocystis group of chroococcacean cyanobacteria, have a smaller range of DNA base compositions (38 to 43 mol% G+C) than the Synechocystis group as a whole does (30 to 48 mol% G+C). Because the DNA base ratios of the Microcystis cultures adjoin or overlap those of the low- and high-G+C-content clusters of the Synechocystis group, DNA base composition data do not differentiate the Microcystis cluster from these two Synechocystis clusters. By bridging the gap between the low- and high-G+C-content clusters of the Synechocystis group, the data for Microcystis create a continuum of DNA base ratios within the Synechocystis group and diminish the usefulness of G+C values for discerning clusters within the phenotypically heterogeneous Synechocystis group.

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