Original paper

Genetic diversity in two species of freshwater cyanobacteria, Planktothrix (Oscillatoria) rubescens and P. agardhii

Humbert, J. F.; Le Berre, B.

Archiv für Hydrobiologie - Hauptbände Volume 150 Number 2 (2001), p. 197 - 206

26 references

published: Jan 11, 2001

DOI: 10.1127/archiv-hydrobiol/150/2001/197

BibTeX file

ArtNo. ESP141015002002, Price: 29.00 €

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The genetic diversity of two freshwater cyanobacteria, Planktothrix rubescens and P. agardhii, was studied by sequencing a 519bp fragment of the 16S rRNA gene, a 550 bp fragment of the psaAB locus, a 517bp fragment of the rbcLX locus and a 550bp fragment of the 16S-23S ITS. Most of the 19 isolates were obtained from five alpine lakes, except for four purchased from culture collections. There was no polymorphism between the P. rubescens/agardhii strains for the 16S rRNA gene (partial sequencing) and only a few polymorphic sites were found in the other sequences. These informative sites had a mosaic structure in the Planktothrix strains, suggesting the occurrence of recombination between them. In contrast, the population structure during a bloom appears to be clonal. The existence of recombinations between the strains of P. rubescens and P. agardhii and the 16S sequencing data suggest that they are conspecific.


CyanobacteriaPlanktothrix rubescensP. agardhiigenetic diversitytaxonomy