Fottea 2020, 20(2):171-191 | DOI: 10.5507/fot.2020.006

Phylogeny and taxonomy of Synechococcus-like cyanobacteria

Jiří Komárek1,2, Jeffrey R. Johansen2,3, Jan ©marda4, Otakar Strunecký5
1 Institute of Botany, Czech Academy of Sciences, Centre for Phycology, Dukelská 135, CZ-37901 Třeboň
2 University of South Bohemia, Faculty of Science, Na Zlaté Stoce 1, CZ-37005 České Budějovice, Czech Republic; e-mail: jiri.komarek@ibot.cas.cz
3 John Carroll University, Department of Biology, University Heights, Ohio 44118, USA
4 Masaryk University, Faculty of Medicine, Department of Biology, Kamenice 5, 62500, Brno - Bohunice, Czech Republic
5 University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, CENAKVA, Institute of Aquaculture and Protection of Waters, Na Sádkách 1780, 370 05 České Budějovice, Czech Republic

Unicellular cyanobacteria constitute a substantial, ecologically important part of freshwater and marine microflora. Solitary, elongated cyanobacterial cells without apparent slime envelopes and dividing in a single plane perpendicular to the longitudinal axis were traditionally classified into the genus Synechococcus. The type species originates from a freshwater benthic habitat while a number of other Synechococcus-like species were described from diverse environments. Morphologically similar, unicellular populations of "Synechococcus" belong to the most abundant oxygen evolving prokaryotes inhabiting freshwater and oceanic picoplanktic communities. Other species from extreme thermal habitats were described from temperatures over 70 °C. Recent molecular analyses, particularly the 16S rRNA gene and other multi-locus gene based phylogenies of Synechococcus-like species reveal the polyphyly and phylogenetic diversity of such simple cyanobacteria emphasizing the necessity of their accurate polyphasic taxonomic re-classification. To better understand the phylogeny of different Synechococcus-like species, we constructed a genome-derived phylogenetic tree using 133 cyanobacterial and eubacterial genomes as well as a 16S rRNA gene phylogenetic tree. Both trees indicate existence of deep splits between individual Synechococcus lineages corresponding with indistinct ecological and cytomorphological differences. The generic units derived from the traditional concept of the genus Synechococcus based on the combined traits and markers must be defined and validly described. The comparative taxonomic classification of phylogenetic clusters corresponding to various morphotypes and genotypes similar to the genus Synechococcus (Cyanobium, Parasynechococcus, Picosynechococcus, Prochlorococcus, Thermosynechococcus, Thermostichus) are discussed in the article.

Keywords: cyanobacteria, picoplankton, phylogeny, Synechococcus-like genera, taxonomy

Received: March 23, 2020; Accepted: June 3, 2020; Prepublished online: September 21, 2020; Published: October 14, 2020Show citation

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Komárek, J., Johansen, J.R., ©marda, J., & Strunecký, O. (2020). Phylogeny and taxonomy of Synechococcus-like cyanobacteria. Fottea, 20(2), 171-191. doi: 10.5507/fot.2020.006
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