The effect of cations (Na+, Mg2+, and Ca2+) on the activity and structure of nitrifying and denitrifying bacterial communities

Macêdo, Williane Vieira; Sakamoto, Isabel Kimiko; Azevedo, Eduardo Bessa; Damianovic, Márcia Helena Rissato Zamariolli

doi:10.1016/j.scitotenv.2019.04.397

Cited by 49 publications

(13 citation statements)

References 73 publications

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“…Increased salt concentrations increase the osmolarity outside the microbial cell, lowering the microbial activity (Rath & Rousk, 2015). Another mechanism of salt toxicity on defined cellular systems is the specific toxicity of ions (Macêdo, Sakamoto, Azevedo, & Damianovic, 2019). As Na + accumulates in soils, soil structure would be destabilized and osmotic and specific ion effects would be induced (Qadir & Schubert, 2002).…”

Section: Discriminating Bacteria In Soils With Different Salinitiesmentioning

confidence: 99%

Shifts in the soil bacterial community along a salinity gradient in the Yellow River Delta

et al. 2020

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Soil salinization has rapidly encroached from the coastline to inland areas over the past two decades in the Yellow River Delta (YRD). Soil samples were collected from low-(LSW), medium-(MSW), and high-(HSW) salinity wetlands at a depth of 0-20 cm for 16S rRNA sequencing and bioinformatic analyses. The richness and α-diversity indices were significantly lower in saline soils (ECe > 15 dS/m, HSW) than in soils those were not saline (ECe < 15 dS/m, LSW and MSW) (p < 0.05), generally showing a decreasing trend with increasing salinities. The phyla, Proteobacteria, Bacteroidetes, Chloroflexi, Acidobacteria and Planctomycetes, represented more than 70% of the bacterial community in the three wetlands, indicating the wide adaption of these phyla to salinity changes. Specifically, Proteobacteria was recognized as the most dominant (35.30%-38.59%) phylum regardless of salinity. Furthermore, bacterial composition was different among the wetlands, as revealed by β-diversity indices and analysis of similarities. Linear discriminant analysis (LDA) effect size revealed the presence of 11, 2, and 10 discriminating bacterial taxa (LDA > 4) among LSW, MSW, and HSW, respectively, implying that they can serve as bioindicators of soil salinization. Redundancy analysis, Spearman correlation analysis, and the Mantel test suggested that salinity parameters (EC, Na + , K + , Mg 2+ , Ca 2+ , Cl − , and SO 4 2−) prominently structured the bacterial community in the current study. These results suggest that the changes of bacterial composition would be induced in these LSW and MSW soils once seawater intrusion occurs.

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Section: Discriminating Bacteria In Soils With Different Salinitiesmentioning

confidence: 99%

Shifts in the soil bacterial community along a salinity gradient in the Yellow River Delta

et al. 2020

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“…As mentioned above (Pollutant Removal), the NH 4 + -N removal of MFC 5 and MFC 6 performed not as well as other groups. Microbial community analysis indicated that the relative abundance of the microorganism with outstanding NH 4 + -N removal ability ( Azospirillum and Aeromonas ) was much lower than that of other groups (Figure e). The possible reason is the screening effect of active ingredients in herbal plants on specific microorganisms.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Performance of Microbial Fuel Cells with Electron Mediators from Anthraquinone/Polyphenol-Abundant Herbal Plants

Yang

Chen

et al. 2020

ACS Sustainable Chem. Eng.

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The limited amount of electron mediators (EMs) excreted by microorganisms has restricted electricity generation and the related pollutant removal in microbial fuel cells (MFCs). The polyphenolic-rich plants contain simple polyphenols or anthraquinones that have promising electron-shuttling potential, but this has not been well understood. Herein, four herbal plants Polygonum multiflorum (T. fallopia), rhubarb (B. rheum), radix rubiae (L. Rubia) and semen cassiae (Catsia tora Linn) were selected and then studied to produce EMs to stimulate electricity generation in MFCs. B. rheum had the highest redox activity and 2% acid pretreatment contributing the most to the release of electroactive substances. The highest power density (18.67 W/m 3 ) and Coulombic efficiency (29.03%) and the lowest internal resistance (29.02 Ω) were achieved in MFCs with B. rheum addition compared to other herbal plants. The satisfactory COD (93.68%) and NH 4 + -N (39.68%) removal were also obtained with a 0.01 g/L dosage. Confocal laser scanning microscopy and high throughput sequencing analysis showed that B. rheum had the least negative effects on biofilm microstructure and microbial species, corresponding to its outstanding performance. These findings first suggested that B. rheum can be regarded as a promising redox mediator to improve MFC performance. This study provided a new thinking to apply herbal wastewater or pharmaceutical waste in improving the bioelectrochemical system.

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“…Organic matter decomposition is the most studied ecosystem function [66], for which interactive effects of salinization with warming and drought have also been explored, implying an additive decrease in decomposition [67,68]. Less is known about salinity effects on biogeochemical cycles, such as nitrogen processing [69] or the carbon cycle [4]. Although the effects of FS on most physico-chemical processes that are relevant at the ecosystem level remain unknown, recent studies have shown alterations in lake stratification [70,71] and changes in greenhouse gas (GHG) production (e.g., methane) [72].…”

Section: Ecosystem Level Processesmentioning

confidence: 99%

“…For the lowest trophic levels (e.g., bacteria, fungi), changes in their communities either in the species composition and/or their activity induced by FS can modulate ecosystem functions and drive processes related to GHG production. Denitrification [69,111], methane production [112], but also dissolved organic carbon, detrital processing, and decomposition [39,68] are key aspects linked to microbial activity that need further attention. Molecular methods used to assess microbial diversity, linking it with functionality, can help to analyse these processes [76].…”

Section: Open Accessmentioning

confidence: 99%

“…The few available studies on FS consequences for microorganisms have focused on community composition [113]. Although assessing microbial diversity or composition is relevant, its functional activity is key at the ecosystem level [69]. Therefore, the link between composition and activity should be further explored by analysing genomic composition of total (DNA) and active (RNA) diversity, which can help to identify the more 3.…”

Section: Open Accessmentioning

confidence: 99%

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Freshwater salinisation: a research agenda for a saltier world

Cunillera‐Montcusí

Beklioğlu

Cañedo‐Argüelles

et al. 2022

Trends in Ecology & Evolution

148

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The effect of cations (Na+, Mg2+, and Ca2+) on the activity and structure of nitrifying and denitrifying bacterial communities

Cited by 49 publications

References 73 publications

Shifts in the soil bacterial community along a salinity gradient in the Yellow River Delta

Shifts in the soil bacterial community along a salinity gradient in the Yellow River Delta

Enhanced Performance of Microbial Fuel Cells with Electron Mediators from Anthraquinone/Polyphenol-Abundant Herbal Plants

Freshwater salinisation: a research agenda for a saltier world

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