Query: NC_008609:112340 Pelobacter propionicus DSM 2379, complete genome Lineage: Pelobacter propionicus; Pelobacter; Pelobacteraceae; Desulfuromonadales; Proteobacteria; Bacteria General Information: Common environmental anaerobe. The genus Pelobacter encompasses a unique group of fermentative microorganisms in the delta-proteobacteria. This species is ubiquitous in both marine and fresh water, and in anaerobic sedmiments. It is able to convert the unsaturated hydrocarbon acetylene to to acetate and ethanol via acetylaldehyde as an intermediate. These microorganisms may survive in some sediments as an Fe(III) or elemental sulfur reducer as well as growing fermentatively as an ethanol-oxidizing acetogen.
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General Information: The strain was isolated from a symbiotic association with the gymnosperm cycad Macrozamia sp. It typically grows in freshwater habitats. This genera of cyanobacteria are typically terrestrially-associated and are especially found in limestone or nutrient-poor soils. They are very similar to Anabaena spp. and historically they have been distinguished on the basis of morphological and life cycle characteristics. Nostoc spp. can grow heterotrophically or photoheterotrophically, and form heterocysts for nitrogen fixation. This organism can form nitrogen-fixing symbiotic relationships with plants and fungi such as the bryophyte Anthoceros punctatus. The relationship is relatively simple as compared to the Rhizobial symbiotic relationship. In the presence of the plant, hormogonia (short motile filaments) infect the plant, and then form long heterocyst-containing (nitrogen-fixing differentiated bacterial cells) filaments. The bacterial cell receives carbon sources in exchange for fixed nitrogen.