Fottea 2017, 17(2):178-190 | DOI: 10.5507/fot.2017.002

Komarekiella atlantica gen. et sp. nov. (Nostocaceae, Cyanobacteria): a new subaerial taxon from the Atlantic Rainforest and Kauai, Hawaii

Guilherme Scotta Hentschke1,2*, Jeffrey R. Johansen3,4, Nicole Pietrasiak5, Janaina Rigonato6, Marli F. Fiore6, Célia Leite Sant'Anna1
1 Institute of Botany, Avenida Miguel Estéfano 3687, 04301-012 São Paulo, SP, Brazil; *Corresponding author e-mail: guilherme.scotta@gmail.com
2 Universidade Luterana do Brasil - ULBRA, Cachoeira do Sul, RS, Brazil
3 Department of Biology, John Carroll University, University Heights, OH 44118 USA
4 Department of Botany, Faculty of Sciences, University of South Bohemia, Branišovská 31, České Budějovice 370 05, Czech Republic
5 Plant and Environmental Sciences Department, New Mexico State University, 945 College Drive, Las Cruces, NM 88003 USA
6 University of São Paulo, Center of Nuclear Energy in Agriculture, Avenida Centenário 303, 13400-970 Piracicaba, SP, Brazil

Six strains of Cyanobacteria sampled in the Brazilian Atlantic rainforest and one strain from Kauai, Hawaii, were studied using morphological and molecular approaches, including 16S rRNA gene phylogenies and 16S-23S ITS secondary structures, and are herein described as Komarekilla atlantica gen. et sp. nov.. Morphologically they are similar to Nostoc, Desmonostoc, Halotia, and Mojavia and indistinguishable from Chlorogloeopsis. The parsimony and Bayesian phylogenies of the 16S rDNA show that these strains are close to nostocacean strains, in strongly supported clades and separated from all other genera. The secondary structures of the 16S-23S ITS were very consistent between strains of K. atlantica, but distinctly different from structures in other close taxa. Of special note, the Hawaiian strain of K. atlantica had 16S sequence identities of 99.5-100% to the Brazilian strains, and 16S-23S ITS sequence identities of 99.4-99.8% to the Brazilian strains, and consequently likely represents a very recent introduction of the species to Kauai from South America, the geographic source of many of the non-native plants in the Hawaiian Archipelago.

Keywords: 16S rDNA, biodiversity, phylogeny, RNA secondary structures, taxonomy, tropical rainforest

Received: August 7, 2016; Accepted: January 4, 2017; Prepublished online: August 23, 2017; Published: September 20, 2017Show citation

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Scotta Hentschke, G., Johansen, J.R., Pietrasiak, N., Rigonato, J., Fiore, M.F., & Leite Sant'Anna, C. (2017). Komarekiella atlantica gen. et sp. nov. (Nostocaceae, Cyanobacteria): a new subaerial taxon from the Atlantic Rainforest and Kauai, Hawaii. Fottea, 17(2), 178-190. doi: 10.5507/fot.2017.002
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