High abundances of aerobic anoxygenic phototrophs in saline steppe lakes

Medová, Hana; Boldareva, E. N.; Hrouzek, Pavel; Борзенко, С. В.; Намсараев, З. Б.; Горленко, В. М.; Намсараев, Б. Б.; Koblížek, Michal

doi:10.1111/j.1574-6941.2011.01059.x

Cited by 26 publications

(27 citation statements)

References 27 publications

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“…) were found in saline steppe lakes in Central Asia (Medová et al 2011), in spite of the fact that the chlorophyll concentrations were comparable to those registered in this study (0.7 to 36.8 µg chl a l −1…”

Section: Discussionmentioning

confidence: 58%

Distribution of aerobic anoxygenic phototrophic bacteria in glacial lakes of northern Europe

Maín¹,

Čuperová²,

Hojerová³

et al. 2012

Aquat. Microb. Ecol.

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Glacial lakes cover large areas of northern Europe and North America. These freshwater systems represent important habitats accommodating diverse microbial communities. Here, 27 lakes in northern Germany, Poland and Finland were surveyed for the presence of aerobic anoxygenic phototrophic (AAP) bacteria during the summer seasons of 2008 and 2009. Using infrared epifluorescence microscopy, AAP bacteria were found to represent from 2 to 12% of total bacteria in surface layers of the studied lakes. The AAP abundance was correlated with total bacterial numbers, total phosphorus and chlorophyll concentration. The size fractionation analyses indicated that a significant portion of AAP cells was attached to particles. Our findings suggest that AAP bacteria represent a significant component of the microbial community in the studied lakes. KEY WORDS: Lakes · Aerobic photosynthetic bacteria · AAP bacteria · Bacteriochlorophyll a · PhotoheterotrophyResale or republication not permitted without written consent of the publisher

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Section: Discussionmentioning

confidence: 58%

Distribution of aerobic anoxygenic phototrophic bacteria in glacial lakes of northern Europe

Maín¹,

Čuperová²,

Hojerová³

et al. 2012

Aquat. Microb. Ecol.

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“…This group was discovered in the coastal waters of Japan in the late 1970s (8,29) and was later recognized as an important part of marine microbial communities (12,17,21,37). The presence of AAPs was also reported in a number of other environments: freshwater (23,28), soda and saline lakes (7,22,24), soils (4,13), and acid hot springs (11).…”

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confidence: 96%

Influence of Light on Carbon Utilization in Aerobic Anoxygenic Phototrophs

Hauruseu

Koblížek

2012

Appl Environ Microbiol

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bAerobic anoxygenic phototrophs contain photosynthetic reaction centers composed of bacteriochlorophyll. These organisms are photoheterotrophs, as they require organic carbon substrates for their growth whereas light-derived energy has only an auxiliary function. To establish the contribution of light energy to their metabolism, we grew the phototrophic strain Erythrobacter sp. NAP1 in a carbon-limited chemostat regimen on defined carbon sources (glutamate, pyruvate, acetate, and glucose) under conditions of different light intensities. When grown in a light-dark cycle, these bacteria accumulated 25% to 110% more biomass in terms of carbon than cultures grown in the dark. Cultures grown on glutamate accumulated the most biomass at moderate light intensities of 50 to 150 mol m ؊2 s ؊1 but were inhibited at higher light intensities. In the case of pyruvate, we did not find any inhibition of growth by high irradiance. The extent of anaplerotic carbon fixation was detemined by radioactive bicarbonate incorporation assays. While the carboxylation activity provided 4% to 11% of the cellular carbon in the pyruvate-grown culture, in the glutamate-grown cells it provided only approximately 1% of the carbon. Additionally, we tested the effect of light on respiration and photosynthetic electron flow. With increasing light intensity, respiration decreased to approximately 25% of its dark value and was replaced by photophosphorylation. The additional energy from light allows the aerobic anoxygenic phototrophs to accumulate the supplied organic carbon which would otherwise be respired. The higher efficiency of organic carbon utilization may provide an important competitive advantage during growth under carbon-limited conditions.

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“…Recently, Gemmatimonas phototrophica was found to harbor a photosynthesis gene cluster of proteobacterial origin [34][35] and phototrophic Gemmatimonadetes bacteria consisting of 0.4-11.9% of whole phototrophic microbial communities in their habitats [36]. The habitats for AAP bacteria are as diverse as marine environments, freshwater lakes, saline lakes, soda lakes, and soils [37][38][39][40]. The complex interplay of local contemporary environmental effects and dispersal limitations contribute to the distribution of anoxygenic phototrophs.…”

Section: Diversity Of Pufm Gene Populationsmentioning

confidence: 99%

Distribution of Aerobic Anoxygenic Phototrophs in Freshwater Plateau Lakes

Tian¹,

Wu²,

Zhou³

et al. 2018

Pol. J. Environ. Stud.

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Aerobic anoxygenic phototrophic (AAP) bacteria are photoheterotrophs that use both organic substrates and solar light for carbon and energy requirements. The prevalence of AAP bacteria and their functional role in biogeochemical cycles were numerously reported in ocean habitats [1][2][3][4]. In most studies, they were defined as an important contributor to the carbon cycle. AAP bacteria could be approximately <1% to 10% of total bacteria in the euphotic zones of marine environments [1,[4][5][6]. The cell size of AAP bacteria was significantly larger than Pol. J. Environ. Stud. Vol. 27, No. 2 (2018), 871-879 AbstractAerobic anoxygenic phototrophic (AAP) bacteria are known functionally as photoheterotrophic microbes. Though numerously reported from ocean habitats, their distribution in freshwater lakes is far less documented. In the present study we investigated the dynamics of AAP bacteria in freshwater plateau lakes. Results revealed a high abundance of AAP bacteria in eutrophic lakes. Moreover, AAP bacteria were positively correlated with TN, TP, and Chl a, but the variations of AAP bacterial proportion to potential total bacteria (AAPB%). Alphaproteobacteria-related sequences dominated lakes Luguhu, Erhai, and Chenghai at ratios of 93.9, 85.4, and 70.6%, respectively, and in total comprised eight clearly defined subgroups. Sequences affiliated with Beta-and Grammaproteobacteria were found to be rare taxa. Additionally, Alkalibacterium-like sequences belonging to Firmutes were assigned. Overall, sequences from Alpha-, Beta-, Gammaproteobacteria, and Firmutes separately comprised of 81.6, 8.8, 0.8, and 4.0%. Our present work revealed extreme dynamics of AAP bacteria in both water columns and non-euphotic sediments of plateau aquatic ecosystems, which consolidated their wide distribution and enhanced adaptation.

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High abundances of aerobic anoxygenic phototrophs in saline steppe lakes

Cited by 26 publications

References 27 publications

Distribution of aerobic anoxygenic phototrophic bacteria in glacial lakes of northern Europe

Distribution of aerobic anoxygenic phototrophic bacteria in glacial lakes of northern Europe

Influence of Light on Carbon Utilization in Aerobic Anoxygenic Phototrophs

Distribution of Aerobic Anoxygenic Phototrophs in Freshwater Plateau Lakes

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