Rubribacterium polymorphum gen. nov., sp. nov., a novel alkaliphilic nonsulfur purple bacterium from an Eastern Siberian soda lake

Boldareva, E. N.; Moskalenko, A. A.; Makhneva, Z. K.; Tourova, T. P.; Kolganova, T. V.; Горленко, В. М.

doi:10.1134/s0026261709060101

Cited by 36 publications

(13 citation statements)

References 17 publications

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“…The composition of the microbial community in the sediments (Gorlenko et al , 1999) and microbial mats in lake Khilganta was studied in the 1990s (Kompantseva et al , 2005); however, little is known about the planktonic bacterial community in these lakes. The presence of photosynthetic bacteria in these lakes has been indicated by the previous work of Bryantseva et al (1999), Kompantseva et al (2005, 2007) and Boldareva et al (2008, 2009a, b), who isolated a number of new species of APB from these environments. However, more detailed information about the abundance and activity of phototrophs in such environments is missing.…”

Section: Introductionmentioning

confidence: 84%

High abundances of aerobic anoxygenic phototrophs in saline steppe lakes

Medová¹,

Boldareva²,

Hrouzek³

et al. 2011

FEMS Microbiology Ecology

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We studied the distribution of anoxygenic phototrophs in 23 steppe lakes in the Transbaikal region (Russia), in Uzbekistan (Central Asia) and in the Crimean peninsula (Ukraine). The lakes varied in their mineral content and composition (salinities from 0.2 to 300 g L À1 ). The Transbaikal lakes were alkaline (pH 4 9), with high amounts of soda. The Uzbek and Crimean lakes were more pH neutral, frequently with high amounts of sulfates. The presence of anoxygenic phototrophs was registered by infrared epifluorescence microscopy, infrared fluorometry and pigment analyses. In mostly shallow, fully oxic lakes, the anoxygenic phototrophs represented 7-65% of the total prokaryotes, with the maxima observed in Transbaikal soda lakes Gorbunka (32%), Khilganta (65%), Zanday (58%) and Zun-Kholvo (46%). Some of the lakes contained over 1 mg bacteriochlorophyll L À1 .In contrast, only small amounts of anoxygenic phototrophs were present in highly mineralized lakes ( 4 100 g total salts L À1 ); Borzinskoe, Tsagan-Nur (Transbaikal), Staroe (Crimea) and in the residual part of the south-west Aral Sea (Uzbekistan). The oxic environment and the specific diurnal changes of bacteriochlorophyll concentration observed suggest that the phototrophic community was mostly composed of aerobic anoxygenic phototrophs. The high abundances and bacteriochlorophyll concentrations point to an important role of aerobic anoxygenic phototrophs in the habitats studied.

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Section: Introductionmentioning

confidence: 84%

High abundances of aerobic anoxygenic phototrophs in saline steppe lakes

Medová¹,

Boldareva²,

Hrouzek³

et al. 2011

FEMS Microbiology Ecology

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“…In soda lakes, the latter are dominated by purple sulfur bacteria, including the high salt-tolerant alkaliphilic gammaproteobacteria of the genera Ecthothiorhodospira and Halorhodospira, and Thiorhodospira, Thioalkalicoccus, Ectothiorhodosinus at low salinity (reviewed in [19]). Also a group associated with the alphaproteobacterial nonsulfur purple bacteria capable of both aerobic and anaerobic oxidation of sulfur compounds is consistently found in soda lakes, both by cultivation and molecular approach, including aerobic bacteriochlorophyll a-containing Roseinatronobacter species and two anoxygenic genera Rhodobaca and Rubribacterium [82][83][84].…”

Section: Sulfur Cycle: the Sulfur Oxidizersmentioning

confidence: 99%

Functional microbiology of soda lakes

Sorokin

Banciu

Muyzer

2015

Current Opinion in Microbiology

104

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“…Rhodobacterales are noted early colonizers of particles (Dang et al, 2008); one of the most prominent genera detected throughout the core was Rubribacterium, a non-sulfur purple bacterium that is a facultative aerobe (Boldareva et al, 2009). These traits help explain the order's presence at all horizons and its decrease in the active fraction with depth.…”

Section: Lower Horizons Boncat-facsmentioning

confidence: 97%

Spatially-resolved correlative microscopy and microbial identification reveals dynamic depth- and mineral-dependent anabolic activity in salt marsh sediment

Marlow

Spietz

Kim³

et al. 2020

Preprint

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Coastal salt marshes are key sites of biogeochemical cycling and ideal systems in which to investigate the community structure of complex microbial communities. Here, we clarify structural-functional relationships among microorganisms and their mineralogical environment, revealing previously undescribed metabolic activity patterns and precise spatial arrangements within salt marsh sediment. Following 3.7-day in situ incubations with a non-canonical amino acid that was incorporated into new biomass, samples were embedded and analyzed by correlative fluorescence and electron microscopy to map the microscale arrangements of anabolically active and inactive organisms alongside mineral grains. Parallel sediment samples were examined by fluorescence-activated cell sorting and 16S rRNA gene sequencing to link anabolic activity to taxonomic identity. Both approaches demonstrated a rapid decline in the proportion of anabolically active cells with depth into salt marsh sediment, from ~60% in the top cm to 10-25% between 2-7 cm. From the top to the bottom, the most prominent active community members shifted from sulfur cycling phototrophic consortia, to sulfate-reducing bacteria likely oxidizing organic compounds, to fermentative lineages. Correlative microscopy revealed more abundant (and more anabolically active) organisms around non-quartz minerals including rutile, orthoclase, and plagioclase. Microbe-mineral relationships appear to be dynamic and context-dependent arbiters of biogeochemical cycling.

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Rubribacterium polymorphum gen. nov., sp. nov., a novel alkaliphilic nonsulfur purple bacterium from an Eastern Siberian soda lake

Cited by 36 publications

References 17 publications

High abundances of aerobic anoxygenic phototrophs in saline steppe lakes

High abundances of aerobic anoxygenic phototrophs in saline steppe lakes

Functional microbiology of soda lakes

Spatially-resolved correlative microscopy and microbial identification reveals dynamic depth- and mineral-dependent anabolic activity in salt marsh sediment

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