Characteristics of inorganic and organic phosphorus in Lake Sha sediments from a semiarid region, Northwest China: Sources and bioavailability

Ma, Haiyuan; Zhu, Yuanrong; Juan, José; Bing, Xiaojie; Xu, Weining; Hu, Xing Jun; Zhang, Songlin; Ya-qin, Shen; He, Zhongqi

doi:10.1016/j.apgeochem.2022.105209

Cited by 19 publications

(9 citation statements)

References 65 publications

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“…Phosphorus, an essential limiting nutrient in aquatic ecosystems, was mainly formed from organic matter (aquatic plants, microalgae, and microorganisms), with Firmicutes mainly involved in sediment phosphorus metabolism. − Radionuclide exposure significantly reduced the sediment’s organic phosphorus content (Figure F), indicating effects on the metabolism of organic phosphorus in organic matter by interfering with the abundance of organic matter-degrading bacteria (Figure B).…”

Section: Resultsmentioning

confidence: 99%

Tritium and Carbon-14 Contamination Reshaping the Microbial Community Structure, Metabolic Network, and Element Cycle in the Seawater Environment

Lai¹,

Li²,

Wang³

et al. 2023

Environ. Sci. Technol.

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The potential ecological risks caused by entering radioactive wastewater containing tritium and carbon-14 into the sea require careful evaluation. This study simulated seawater’s tritium and carbon-14 pollution and analyzed the effects on the seawater and sediment microenvironments. Tritium and carbon-14 pollution primarily altered nitrogen and phosphorus metabolism in the seawater environment. Analysis by 16S rRNA sequencing showed changes in the relative abundance of microorganisms involved in carbon, nitrogen, and phosphorus metabolism and organic matter degradation in response to tritium and carbon-14 exposure. Metabonomics and metagenomic analysis showed that tritium and carbon-14 exposure interfered with gene expression involving nucleotide and amino acid metabolites, in agreement with the results seen for microbial community structure. Tritium and carbon-14 exposure also modulated the abundance of functional genes involved in carbohydrate, phosphorus, sulfur, and nitrogen metabolic pathways in sediments. Tritium and carbon-14 pollution in seawater adversely affected microbial diversity, metabolic processes, and the abundance of nutrient-cycling genes. These results provide valuable information for further evaluating the risks of tritium and carbon-14 in marine environments.

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Section: Resultsmentioning

confidence: 99%

Tritium and Carbon-14 Contamination Reshaping the Microbial Community Structure, Metabolic Network, and Element Cycle in the Seawater Environment

Lai¹,

Li²,

Wang³

et al. 2023

Environ. Sci. Technol.

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“…Extracellular APs are important for recycling P in environmental matrices (i.e., soils, sediments, and marine environments). , Therefore, the reactivity of these enzymes toward P-biopolymers is of special interest because P-biopolymers such as RNA and polyP are ubiquitous P sources for plant and soil microorganisms. − , However, despite the high abundances of plant and fungal APs in P i -deficient soils, much has remained unknown about the relative reactivity kinetics and mechanisms of substrate specificity by different APs for P recycling from P-biopolymers. Here, in addition to demonstrating that our representative fungal and plant APs are both capable of dephosphorylating both polyP and RNA, we found that the extent of the reactivity toward each P-biopolymer was different for each enzyme (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…Phosphorus-containing biopolymers (P-biopolymers) represent slow-releasing phosphorus (P) reservoirs for plants and soil microorganisms, − especially in the upper horizon of young soils . With dependence on the land usage, soils can contain a range of concentrations of P-biopolymers, including ribonucleic acids (RNAs) (1–56 mg RNA-P kg –1 soil) and inorganic polyphosphates (polyPs) (5–50 mg P kg –1 soil). − In agricultural soils, fertilizer application can result in elevated levels of P-biopolymers. , Intracellularly, there are enzymes that specifically hydrolyze polyP and RNA. − For polyP, intracellular exo- and endopolyphosphatases cleave phospho-anhydride bonds from the end or the middle of the polyP chains, respectively; for RNA, intracellular phospho-diesterases (P-diesterases) such as ribonucleases produce ribonucleotides, which are subsequently hydrolyzed by phospho-monoesterases (P-monoesterases) to ribonucleosides and orthophosphate (inorganic P or P i ). , Compared to the aforementioned intracellular enzymes, extracellular P-monoesterases have higher stability in the soil environment and are found at up to 2-fold higher abundance. − Furthermore, extracellular P-monoesterases, which include acid phosphatases (APs) and phytases, are reportedly in excess in soils because their activity is limited by the concentrations of phosphomonoester (P-monoester) substrates .…”

Section: Introductionmentioning

confidence: 99%

“…Phosphorus-containing biopolymers (P-biopolymers) represent slow-releasing phosphorus (P) reservoirs for plants and soil microorganisms, 1 − 4 especially in the upper horizon of young soils. 5 With dependence on the land usage, soils can contain a range of concentrations of P-biopolymers, including ribonucleic acids (RNAs) (1–56 mg RNA-P kg –1 soil) and inorganic polyphosphates (polyPs) (5–50 mg P kg –1 soil).…”

Section: Introductionmentioning

confidence: 99%

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Selectivity in Enzymatic Phosphorus Recycling from Biopolymers: Isotope Effect, Reactivity Kinetics, and Molecular Docking with Fungal and Plant Phosphatases

Solhtalab

Moller

et al. 2022

Environ. Sci. Technol.

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Among ubiquitous phosphorus (P) reserves in environmental matrices are ribonucleic acid (RNA) and polyphosphate (polyP), which are, respectively, organic and inorganic P-containing biopolymers. Relevant to P recycling from these biopolymers, much remains unknown about the kinetics and mechanisms of different acid phosphatases (APs) secreted by plants and soil microorganisms. Here we investigated RNA and polyP dephosphorylation by two common APs, a plant purple AP (PAP) from sweet potato and a fungal phytase from Aspergillus niger. Trends of δ18O values in released orthophosphate during each enzyme-catalyzed reaction in 18O-water implied a different extent of reactivity. Subsequent enzyme kinetics experiments revealed that A. niger phytase had 10-fold higher maximum rate for polyP dephosphorylation than the sweet potato PAP, whereas the sweet potato PAP dephosphorylated RNA at a 6-fold faster rate than A. niger phytase. Both enzymes had up to 3 orders of magnitude lower reactivity for RNA than for polyP. We determined a combined phosphodiesterase-monoesterase mechanism for RNA and terminal phosphatase mechanism for polyP using high-resolution mass spectrometry and 31P nuclear magnetic resonance, respectively. Molecular modeling with eight plant and fungal AP structures predicted substrate binding interactions consistent with the relative reactivity kinetics. Our findings implied a hierarchy in enzymatic P recycling from P-polymers by phosphatases from different biological origins, thereby influencing the relatively longer residence time of RNA versus polyP in environmental matrices. This research further sheds light on engineering strategies to enhance enzymatic recycling of biopolymer-derived P, in addition to advancing environmental predictions of this P recycling by plants and microorganisms.

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“…Ca-P is generally composed of clastic carbonate-bound P and authigenic apatite-bound P. Apatite in sediments is the only phosphate rock that maintains its original form for a long period (Pettersson et al, 1988). Therefore, Ca-P is generally considered to be relatively inert, which would be buried in sediments (Ma et al, 2022). Also, Ca-P is likely gradually released under some special conditions, such as acidic conditions (Ni et al, 2016).…”

Section: Characteristics Of P Fractions In Sediments and Soilsmentioning

confidence: 99%

Geochemical cycling of phosphorus and iron in a typical reservoir in the area of Xiaoxing’an mountains, northeastern China

Bing

Kuo

et al. 2022

Front. Environ. Sci.

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Reservoirs have an important impact on riverine material migration and transformation. Taking a drinking water reservoir located in the cold-temperature forest in the Xiaoxing’an mountains as an example, we comprehensively analyzed the fractions and interrelationships of phosphorus (P) and iron (Fe) from soils to riverine and reservoir sediments and discussed the coordinated migration and transformation process of regional P and Fe and the effects of dam interception. The results showed that iron-bound P (Fe-P) and aluminum-bound P (Al-P) were significantly correlated with adsorbed Fe(II), carbonate-bound Fe (Fecarb), low-activity silicate-bound Fe (Feprs), and total contents of Fe (TFe), which indicated that the geochemical cycling of these P fractions and Fe fractions is likely closely related and active in the soils and sediments. Calcium-bound P (Ca-P) was significantly correlated with magnate (Femag) and Feprs, which may be due to the correlation between their background values in this area. The contents of active P including loosely sorbed P (L-P), Al-P, and Fe-P in the reservoir’s sediments were significantly higher than those in the upstream soils and sediments (p < 0.05). However, Ca-P and residual P (Res-P) in soil and sediment samples showed no significant difference between the reservoir and its upstream (p = 0.309 > 0.05 and p = 0.748 > 0.05, respectively). Construction of reservoirs has played a certain role in intercepting P, especially bioavailable P, transferred from upstream soils and riverine sediments. The contents of highly active Fe fractions including easily reducible (amorphous) Fe oxide (Feox1), reducible (crystalline) Fe oxide (Feox2) and Fecarb (p < 0.01), and other Fe fractions (p < 0.05) in the sediments of the reservoir were significantly higher than those in the soil or sediment samples from upstream. This indicated that all Fe fractions migrated in the river were affected by the dam interception. The effects of dam interception would affect the bioavailability of P and Fe and enhance the cycling of nutrients in the region. Finally, this also effects the bioavailability and cycling of P and Fe in the downstream rivers and even the oceans.

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Characteristics of inorganic and organic phosphorus in Lake Sha sediments from a semiarid region, Northwest China: Sources and bioavailability

Cited by 19 publications

References 65 publications

Tritium and Carbon-14 Contamination Reshaping the Microbial Community Structure, Metabolic Network, and Element Cycle in the Seawater Environment

Tritium and Carbon-14 Contamination Reshaping the Microbial Community Structure, Metabolic Network, and Element Cycle in the Seawater Environment

Selectivity in Enzymatic Phosphorus Recycling from Biopolymers: Isotope Effect, Reactivity Kinetics, and Molecular Docking with Fungal and Plant Phosphatases

Geochemical cycling of phosphorus and iron in a typical reservoir in the area of Xiaoxing’an mountains, northeastern China

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