Phylogenetic and physiological characterization of a filamentous anoxygenic photoautotrophic bacterium ?Candidatus Chlorothrix halophila? gen. nov., sp. nov., recovered from hypersaline microbial mats
- 1 January 2004
- journal article
- research article
- Published by Springer Nature in Archiv für Mikrobiologie
- Vol. 181 (1) , 17-25
- https://doi.org/10.1007/s00203-003-0615-7
Abstract
We report the phylogenetic and physiological characterization of a mesophilic and halophilic member of the filamentous anoxygenic phototrophic (FAP) bacteria, provisionally named ‘Candidatus Chorothrix halophila’ gen. nov. sp. nov., that has been maintained in a highly enriched culture in our laboratory for over a decade. Phylogenetic analysis of small-subunit RNA-encoding sequences places ‘Candidatus Chlorothrix halophila’ in a clade that includes cultivated members of the genera Chloroflexus and Oscillochloris. Physiological studies demonstrated sulfide-dependent photosynthetic uptake of 14C-labeled bicarbonate. Enzymatic assays for the activity of propionyl-coenzyme A synthase indicated that ‘Candidatus Chlorothrix halophila’ does not use the 3-hydroxypropionate cycle of Chloroflexus aurantiacus OK-70-fl for autotrophic carbon assimilation. New concepts regarding the taxonomy and phylogeny of FAP bacteria have emerged from this work.Keywords
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