Document Detail


Halotia gen. nov., a phylogenetically and physiologically coherent cyanobacterial genus isolated from marine coastal environments.
MedLine Citation:
PMID:  25424485     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Nostoc is a common and well-studied genus of cyanobacteria, and, according to molecular phylogeny, is a polyphyletic group. Therefore, revisions of this genus are urged in the attempt to clarify its taxonomy. Novel strains isolated from underexplored environments and morphologically assigned to the genus Nostoc are not genetically related to the true Nostoc group. In this study, four strains isolated from biofilms collected in Antarctica and five strains originated from Brazilian mangroves were evaluated. Despite their morphological similarities with other Nostoc morphotypes, these nine strains differed from the other morphotypes in ecological, physiological and genetic aspects. Based on the phylogeny of the 16S rRNA gene, the Antarctic sequences were grouped together with the Brazilian mangrove and Nostoc sp. 'Mollenhauer 1:1-067 ' sequences in a highly supported cluster (74 % bootstrap value, ML). This new cluster was phylogenetically separated from the true Nostoc clade and from the clades of the morphologically similar genera Mojavia and Desmonostoc. The 16S rRNA sequences generated in this study exhibited 96 % similarity with sequences from the nostocacean genera mentioned above. Physiologically, these nine strains showed the capacity to grow in a salinity range of 1 - 10 % NaCl, indicating their tolerance of saline concentrations. These results provide support for the description of a new genus, named Halotia, which is morphologically related to the genera Nostoc, Mojavia and Desmonostoc. Within this new genus, three novel species were recognised and described based on morphology and internal transcribed spacer (ITS) secondary structures: H. branconii, H. longispora and H. wernerae, under the provisions of the International Code of Nomenclature for Algae, Fungi, and Plants.
Authors:
Diego Bonaldo Genuário; Marcelo G M V Vaz; Guilherme Scotta Hentschke; Celia Leite Sant'Anna; Marli Fatima Fiore
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-25
Journal Detail:
Title:  International journal of systematic and evolutionary microbiology     Volume:  -     ISSN:  1466-5034     ISO Abbreviation:  Int. J. Syst. Evol. Microbiol.     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-26     Completed Date:  -     Revised Date:  2014-11-27    
Medline Journal Info:
Nlm Unique ID:  100899600     Medline TA:  Int J Syst Evol Microbiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014, the Society for General Microbiology.
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