scholarly journals Genomics Reveals the Metabolic Potential and Functions in the Redistribution of Dissolved Organic Matter in Marine Environments of the Genus Thalassotalea

2020 ◽  
Vol 8 (9) ◽  
pp. 1412
Author(s):  
Minji Kim ◽  
In-Tae Cha ◽  
Ki-Eun Lee ◽  
Eun-Young Lee ◽  
Soo-Je Park
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Extracellular Enzymes ◽  
Marine Invertebrates ◽  
Carbon Sources ◽  
Marine Environments ◽  
Metabolic Potential ◽  
Carbohydrate Utilization ◽  
Genes Encoding ◽  
Metagenomic Study

Members of the bacterial genus Thalassotalea have been isolated recently from various marine environments, including marine invertebrates. A metagenomic study of the Deepwater Horizon oil plume has identified genes involved in aromatic hydrocarbon degradation in the Thalassotalea genome, shedding light on its potential role in the degradation of crude oils. However, the genomic traits of the genus are not well-characterized, despite the ability of the species to degrade complex natural compounds, such as agar, gelatin, chitin, or starch. Here, we obtained a complete genome of a new member of the genus, designated PS06, isolated from marine sediments containing dead marine benthic macroalgae. Unexpectedly, strain PS06 was unable to grow using most carbohydrates as sole carbon sources, which is consistent with the finding of few ABC transporters in the PS06 genome. A comparative analysis of 12 Thalassotalea genomes provided insights into their metabolic potential (e.g., microaerobic respiration and carbohydrate utilization) and evolutionary stability [including a low abundance of clustered regularly interspaced short palindromic repeats (CRISPR) loci and prophages]. The diversity and frequency of genes encoding extracellular enzymes for carbohydrate metabolism in the 12 genomes suggest that members of Thalassotalea contribute to nutrient cycling by the redistribution of dissolved organic matter in marine environments. Our study improves our understanding of the ecological and genomic properties of the genus Thalassotalea.

Effects of dissolved organic matter and reduced sulphur on copper bioavailability in coastal marine environments

2011 ◽  
Vol 74 (3) ◽  
pp. 230-237 ◽  
Author(s):  
Sarah G.S. DePalma ◽  
W. Ray Arnold ◽  
James C. McGeer ◽  
D. George Dixon ◽  
D. Scott Smith
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Marine Environments ◽  
Coastal Marine ◽  
Copper Bioavailability

Molecular insights into the unique degradation trajectory of natural dissolved organic matter from surface to groundwater

2021 ◽  
Author(s):  
Liza McDonough ◽  
Megan Behnke ◽  
Robert Spencer ◽  
Christopher Marjo ◽  
Martin Andersen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Surface Water ◽  
Organic Carbon ◽  
Dissolved Organic Matter ◽  
Molecular Properties ◽  
Marine Environments ◽  
Groundwater Environment ◽  
Ft Icr Ms ◽  
Over Time ◽  
Ft Icr

<p>Dissolved organic matter (DOM) comprises a large and complex range of molecules with varying mass, elemental arrangements, conformation, and polarity. These diverse molecules interact with the environment resulting in changes to their molecular character and reactivity over time. Significant advances in our understanding of the molecular character of reactive and recalcitrant DOM have been made throughout the past decade, largely due to the development of ultra-high resolution techniques such as Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS). This understanding, however, is almost entirely based on surface water environments. Here, we investigate how the molecular properties of DOM change due to reactions occurring in a groundwater environment over time. We use FT-ICR MS combined with liquid chromatography organic carbon detection (LC-OCD), fluorescence and radiocarbon (<sup>14</sup>C) dissolved organic carbon (DOC) for a range of groundwater DOM samples, including the oldest DOC reported from a site which is not impacted by sedimentary organic carbon inputs (25,310 ± 600 years BP). Our results indicate that polarity and nominal oxidation state of carbon (NOSC) play a major role in the reactivity of groundwater DOM, with a preferential removal of hydrophilic, high oxygen to carbon (O/C) ratio molecules over time (r<sub>s</sub> = 0.91, p = 2.4 x 10<sup>-6</sup>). We also note an increase in likely bio-produced molecules containing low numbers of O atoms in deep methanogenic groundwater environments. These molecular formulae appear to accumulate due to the prolonged anoxic conditions which would not be experienced by surface water DOM. The decline in NOSC with increasing average bulk groundwater DOC age contrasts with findings from marine environments where NOSC has been reported to increase over time. Furthermore, the proportion of specific molecular formulae which are stable in marine waters, decline in groundwater as <sup>14</sup>C<sub>DOC</sub> decreases (r<sub>s</sub> = 0.68, p = 6.9 x 10<sup>-3</sup>) suggesting that current indicators of DOM degradation state derived from marine environments are not applicable to groundwater environments. Our research shows that the molecular character of reactive DOM in groundwater differs from that of surface water due to exposure to different environments and processing mechanisms, suggesting that it is the interaction between external environmental factors and intrinsic DOM molecular properties which control DOM recalcitrance.</p>

scholarly journals Glacier Outflow Dissolved Organic Matter as a Window Into Seasonally Changing Carbon Sources: Leverett Glacier, Greenland

2020 ◽  
Vol 125 (4) ◽  
Author(s):  
A. M. Kellerman ◽  
J. R. Hawkings ◽  
J. L. Wadham ◽  
T. J. Kohler ◽  
M. Stibal ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Carbon Sources
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