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International Journal on Algae
SJR: 0.216 SNIP: 0.322 CiteScore™: 0.4

ISSN Print: 1521-9429
ISSN Online: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v18.i4.10
pages 301-320

New Taxa for the Flora of Ukraine, in the Context of Modern Approaches to Taxonomy of Cyanoprokaryota/Cyanobacteria

T. I. Mikhailyuk
N.G. Kholodny Institute of Botany, NAS of Ukraine, 2 Tereshchenhovskaya Str., Kiev 01004, Ukraine
O. N. Vinogradova
M.G. Kholodny Institute of Botany, NAS of Ukraine, Tereschenkivska Str. 2, Kiev 01601, Ukraine
K. Glaser
University of Rostock, Institute of Biol. Sci., Department of Appl. Ecology and Phycology, 3, Albert-Einstein-Strasse, Rostock D-18057, Germany
U. Karsten
University of Rostock, Institute of Biol. Sci., Department of Appl. Ecology and Phycology, 3 Albert-Einstein-Strasse, Rostock D-18057, Germany

ABSTRACT

In biological soil crusts from coastal sites of Ukraine a number of interesting cyanobacterial morphotypes were recorded. Characterization of seven original strains using molecular, morphological, and ecological information revealed that they belong to newly described genera of the orders Synechococcales (Oculatella Zammit, Billi et Albertano and Nodosilinea Perkerson et Casamatta) and Nostocales (Roholtiella M. Bohunicka, Pietrasiak et Johansen). In phylogenetic analyses using sequences of the 16S rRNA gene, all Ukrainian strains could be assigned to clades of the corresponding genera with a high degree of support in the Bayesian and Maximum Likelihood analyses. However, their species-level identification has been successful only for one strain of the genus Roholtiella. The phylogeny based on the 16S rRNA gene concatenated with the 16S-23S ITS region of the original strain and 12 published strains of Roholtiella showed that the Ukrainian strain is closely related to R. edaphica Bohunicka et Lukesova. Its rRNA secondary structure of the Box-B and V3 helices of the 16S-23S ITS region, and of nucleotide sequences flanking them, in main features correspond to R. edaphica. Original strains of genera Oculatella and Nodosilinea were quite similar to each other by the nucleotide sequences of the 16S rRNA gene. But, phylogenetic trees based on the 16S-23S ITS region of both original and published strains of these genera indicated that our isolates might represent new species as they form highly supported distinct clades. The findings of three new genera for the flora of Ukraine demonstrate the importance of using modern approaches for the assessment of real diversity of cyanobacteria in nature.


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