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Volume 59, Issue 4

sp. nov., an alkaliphilic and halophilic purple sulfur bacterium from soda lakes Free

Abstract

During studies of moderately halophilic strains of from steppe soda lakes, we found a novel group of bacteria related to with salt optima at 50–80 g NaCl l. Phylogenetic analysis using 16S rRNA gene sequences of strains from soda lakes in Mongolia, Egypt and Siberia revealed separation of the group of new isolates from other species, including the closely related . DNA–DNA hybridization studies demonstrated that the new isolates form a homogeneous group at the species level, but at the same time are distinct from related species such as , , and . The new isolates are considered to be strains of a novel species, for which the name sp. nov. is proposed, with the type strain WN22 (=VKM B-2479 =DSM 21381). Photosynthetic pigments of the novel species are bacteriochlorophyll and carotenoids of the spirilloxanthin series with spirilloxanthin and derivatives thereof, together with small amounts of lycopene and rhodopin. Gas vesicles are formed by most of the strains, particularly in media containing yeast extract (0.5 g l) and acetate (0.5–2.0 g l). Sequence analysis of (nitrogenase) and (RuBisCO) confirmed the assignment of the strains to the genus and in particular the close relationship to . The novel species is found in soda lakes separated by great geographical distances and is an alkaliphilic and halophilic bacterium that tolerates salt concentrations up to 150–200 g NaCl l.

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2009-04-01
2024-04-18
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Ectothiorhodospira variabilis sp. nov., an alkaliphilic and halophilic purple sulfur bacterium from soda lakes
Int J Syst Evol Microbiol 59, 658 (2009); https://doi.org/10.1099/ijs.0.004648-0
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vol. , part 4, pp. 658 - 664

Phylogenetic position of strain WN22 among members of the based on conceptual translations of . The tree was generated by the maximum-likelihood method.

Phylogenetic position of strain WN22 among members of the based on deduced amino acid sequences of genes. The tree was constructed by the neighbour-joining algorithm with sp. PCC 7120 as the outgroup.

[PDF file of Supplementary Figs S1 and S2](21 KB)

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