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EVOLUTIONARY RELATIONSHIPS OF CULTIVATED ANTARCTIC OSCILLATORIANS (CYANOBACTERIA)
Article first published online: 21 DEC 2001
Journal of Phycology
Volume 37, Issue 4, pages 650–654, August 2001
How to Cite
Nadeau, T.-L., Milbrandt, E. C. and Castenholz, R. W. (2001), EVOLUTIONARY RELATIONSHIPS OF CULTIVATED ANTARCTIC OSCILLATORIANS (CYANOBACTERIA). Journal of Phycology, 37: 650–654. doi: 10.1046/j.1529-8817.2001.037004650.x
Received 4 November 1999. Accepted 18 April 2001.
- Issue published online: 21 DEC 2001
- Article first published online: 21 DEC 2001
- 16S rDNA;
- polar cyanobacteria;
The evolutionary relationships of cultivated psychrophilic and psychrotolerant polar oscillatorians were examined, based on small subunit rDNA sequences. Psychrophilic oscillatorians from the Antarctic were affiliated in one well-supported clade, which also includes two Arctic strains. Two of the Antarctic psychrophiles contain an 11-nucleotide insertion that is identical to, and previously only described in, an Arctic oscillatorian. The psychrotolerant phenotype, conversely, has arisen multiple times in the cyanobacterial lineage, and psychrotolerant strains are sometimes most closely related to organisms of temperate latitudes. These findings support the hypothesis that oscillatorians in both polar regions originated from more temperate species. Furthermore, morphological designations of these filamentous cyanobacteria often do not have phylogenetic significance.