Related Research Articles
Polynucleobacter is a genus of Proteobacteria, originally established by Heckmann and Schmidt (1987) to exclusively harbor obligate endosymbionts of ciliates belonging to the genus Euplotes.
Limnohabitans is a genus of Proteobacteria established by Hahn et al. (2010). The genus contains four species which all represent planktonic bacteria dwelling in the water column of freshwater lakes, reservoirs, and streams.
Limnohabitans australis is an aerobic, nonmotile bacterium from the genus Limnohabitans and family Comamonadaceae, which was isolated from a freshwater pond in São Carlos, São Paulo state, Brazil.
Polynucleobacter necessarius is a bacterium of the genus Polynucleobacter. Since the last revision of the species, it contains exclusively obligate endosymbionts dwelling in cells of the ciliate Euplotes aediculatus and related species. This is in contrast to other species of the genus Polynucleobacter, which exclusively harbour free-living bacteria dwelling in the water column of freshwater systems. The genome of P. necessarius has been completely sequenced.
Polynucleobacter acidiphobus is an aerobic, chemo-organotrophic, catalase- and oxidase-positive, nonmotile bacterium of the genus Polynucleobacter. The type strain was isolated from a rock pool which was filled with fresh water in a mountain brook in Corsica in France.
Polynucleobacter difficilis is an aerobic, catalase- and oxidase-positive, chemo-organotrophic, nonmotile, freshwater bacterium of the genus Polynucleobacter, isolated from the Lake Sevan from a depth of 60 m in Armenia.
Polynucleobacter rarus is an aerobic, chemo-organotrophic, catalase- and oxidase-positive, nonmotile bacterium of the genus Polynucleobacter, isolated from an acidic lake in Wisconsin.
Polynucleobacter asymbioticus is an aerobic, catalase- and oxidase-positive, chemo-organotrophic, nonmotile, free-living bacterium of the genus Polynucleobacter. The type strain was isolated from a small pond located in the Austrian Alps in the area of Salzburg and described as a new subspecies of Polynucleobacter necessarius in 2009. The classification of the type strain was hampered by the fact that its closest described relative represented obligate endosymbionts, i.e. P. necessarius, not available as a pure culture suitable for standard tests for delineation of prokaryotic species. Therefore, the strain was preliminarily placed in the subspecies P. necessarius subsp. asymbioticus. Later sequencing of the genome of the type strain revealed that the strain represented a novel species within the genus Polynucleobacter. Therefore, its taxonomic rank was lifted from the subspecies to the species level. Strains of P. asymbioticus dwell as planktonic organisms in acidic, humic-rich freshwater systems. Comparative genome analyses revealed that P. asymbioticus represents an atypical member of the family Burkholderiaceae regarding its small genome size and its passive lifestyle. A recent study used a collection of 37 P. asymbioticus strains isolated from various ponds located in a larger region of the Austrian Alps to gain insights in the evolution of Polynucleobacter bacteria.
Polynucleobacter duraquae is an aerobic, chemo-organotrophic, catalase- and oxidase-positive, sometimes motile, free-living bacterium of the genus Polynucleobacter, isolated from Lake Mondsee in Austria. The species represents planktonic bacteria (bacterioplankton) dwelling in alkaline freshwater systems.
Polynucleobacter sinensis is an aerobic, chemo-organotrophic, catalase- and oxidase-positive, free-living bacterium of the genus Polynucleobacter, isolated from a freshwater pond in China. The species represents planktonic bacteria (bacterioplankton) dwelling in non-acidic freshwater systems. The species name refers to the origin of the type strain from China.
Polynucleobacter yangtzensis is an aerobic, chemo-organotrophic, catalase- and oxidase-positive, sometimes motile, free-living bacterium of the genus Polynucleobacter, isolated from Yangtze River in the City of Nanjing (China). The species represents planktonic bacteria (bacterioplankton) dwelling in alkaline freshwater systems. The species name refers to the origin of the type strain.
Rhodoluna is a Gram-positive, non-spore-forming and non-motile genus of bacteria from the family of Microbacteriaceae. The type strain of the only species Rhodoluna lacicola encodes an actinorhodopsin, which is a light-diven proton pump enabling light energy conversion, potentially resulting in a mixotrophic physiology. The type strain of R. lacicola was isolated from Lake Tai in China. The type strain MWH-Ta8 is remarkable for its very small cell size ultramicrobacterium and its small genome size of only 1.4 Mbp. The type strain has a planktonic lifestyle, that is freely floating the water column of aquatic systems. Currently, the genus Rhodoluna contains two described species.
Polynucleobacter meluiroseus is an aerobic, chemo-organotrophic, non-motile, free-living bacterium of the genus Polynucleobacter.
Polynucleobacter campilacus is an aerobic, catalase- and oxidase-positive, chemo-organotrophic, nonmotile, free-living bacterium of the genus Polynucleobacter., The type strain was isolated from Lake Feldsee located in the Southern Black Forest in Germany. The species epithet "campilacus" refers to the origin of the type strain from this lake. The complete genome sequence of the strain was determined. Among the described Polynucleobacter species, P. campilacus is closest related to P. hirudinilacicola.
Polynucleobacter victoriensis is an aerobic, chemo-organotrophic, non-motile, free-living bacterium of the genus Polynucleobacter.
Polynucleobacter aenigmaticus is an aerobic, facultatively anaerobic, chemo-organotrophic, non-motile, free-living bacterium of the genus Polynucleobacter.
Polynucleobacter sphagniphilus is an aerobic, chemo-organotrophic, non-motile, free-living bacterium of the genus Polynucleobacter.
Polynucleobacter hirudinilacicola is an aerobic, chemo-organotrophic, non-motile, free-living bacterium of the genus Polynucleobacter.
Polynucleobacter paneuropaeus is an aerobic, facultatively anaerobic, chemo-organotrophic, non-motile, free-living bacterium of the genus Polynucleobacter.
Aquirufa is a genus of red-pigmented freshwater bacteria affiliated with the family of Cytophagaceae.
References
- ↑ Hahn, M.W., L.R. Huymann, U. Koll, J. Schmidt, E. Lang, M. Hoetzinger (2017) Polynucleobacter wuianus sp. nov., a free-living freshwater bacterium affiliated with the cryptic species complex PnecC. Int. J. Syst. Evol. Microbiol. 67: 379-385. (doi: 10.1099/ijsem.0.001637)
- ↑ Hahn, M.W., Pöckl, M. and Wu, Q.L. (2005) Low intraspecific diversity in a Polynucleobacter subcluster population numerically dominating bacterioplankton of a freshwater pond. Appl. Environ. Microbiol. 71: 4539–4547.
