Nucleotide sequences of fragments of 16S rRNA of the baikal natural populations and laboratory cultures of cyanobacteria

Nucleotide sequences were determined for the 16S I RNA gene 5 ' -terminal r egions of 29 strains of picoplankton cyanobacteria from the lake Baikal in Russia and four strains from the lake Constance (Bodensee) in Germany. Sequ ences of a 387-bp region of the gene of cultivated strains designated A, B, C, D, and E had only a few (1-3) substitutions as compared with the 3-27 s equence of the clones obtained earlier by cloning fi om a pooled sample of Baikalian winter picoplankton. The specific 4-33 sequence obtained earlier from a dominant species of Baikalian picoplankton was not found in cultivat ed cyanobacteria.