Halotolerant microbial consortia able to degrade highly recalcitrant plant biomass substrate

Cortes-Tolalpa, Larisa; Norder, Justin; Elsas, Jan Dirk van; Salles, Joana Falcão

doi:10.1007/s00253-017-8714-6

Cited by 54 publications

(33 citation statements)

References 48 publications

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“…In addition, after that, the metabolic activity and consumption of the remaining substrates increases (Bonner et al, 2018). In the final stage, the substrate reaches a status similar to the initial one of the soils, and there is a decline in microbial activity and biomass (Cortes-Tolalpa et al, 2018), therefore, reducing basal respiration, which was observed in this study at 30 days of incubation.…”

Section: Discussionsupporting

confidence: 67%

Responses of Soil Microbial Activity to Swine Manure Applications

Martins¹,

Silva²,

Caldas³

et al. 2020

JAS

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The allocation of the large amount of swine waste from farms is an international concern. An efficient way of managing such waste is its use in farming. It is already known that the incorporation of organic waste into the soil significantly increases the microbial population. Therefore, the objective was to evaluate the impact of the use of swine manure on the soil microbiota in a Eutrophic Oxisol. The experiment was set up in a completely randomized design in a 6 × 4 factorial scheme (sixconcentrations of swine manure and four evaluation periods) with four replications. We evaluate the following characteristics: microbial respiration (C-CO2), microbial biomass (µC g-1 soil) and pH.: microbial respiration (C-CO2), microbial biomass (µC g-1 soil) and pH. A significant effect was found in the interaction between concentrations and time of incubation (p < 0.05) of swine manure on microbial activity in the soil. The amount of microbial carbon increased as a function of increased levels of liquid swine manure. No interaction was observed between concentrations and time of incubation for the pH. The evaluation of the isolated factors allowed to observe that the pH decreased as the doses of manure were incremented. Higher and lower pH values were found after 5 and 30 days of incubation. The application of liquid swine manure up to 6000 L ha-1 increases the release of CO2 and carbon in the microbial biomass. The applications of liquid swine manure cause a gradual reduction in soil pH.

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Section: Discussionsupporting

confidence: 67%

Responses of Soil Microbial Activity to Swine Manure Applications

Martins¹,

Silva²,

Caldas³

et al. 2020

JAS

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“…We speculated that halophilic/halotolerant microbes in lakes of high salinity have to exploit a broader range of carbon sources due to high energy costs to deal with salinity stress relative to those in lakes of low salinity [ 70 ], and thus they may have developed an ability to degrade organic matter with a higher carbon number and more complex structures. Indeed, many halotolerant/halophilic prokaryotes have been indicated to possess specific enzymes that have a high efficiency to degrade recalcitrant organic matter (e.g., lignin, cellulose, and chitin) [ 71 , 72 ].…”

Section: Discussionmentioning

confidence: 99%

Potential utilization of terrestrially derived dissolved organic matter by aquatic microbial communities in saline lakes

Yang

Jiang

et al. 2020

The ISME Journal

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Lakes receive large amounts of terrestrially derived dissolved organic matter (tDOM). However, little is known about how aquatic microbial communities interact with tDOM in lakes. Here, by performing microcosm experiments we investigated how microbial community responded to tDOM influx in six Tibetan lakes of different salinities (ranging from 1 to 358 g/l). In response to tDOM addition, microbial biomass increased while dissolved organic carbon (DOC) decreased. The amount of DOC decrease did not show any significant correlation with salinity. However, salinity influenced tDOM transformation, i.e., microbial communities from higher salinity lakes exhibited a stronger ability to utilize tDOM of high carbon numbers than those from lower salinity. Abundant taxa and copiotrophs were actively involved in tDOM transformation, suggesting their vital roles in lacustrine carbon cycle. Network analysis indicated that 66 operational taxonomic units (OTUs, affiliated with Alphaproteobacteria , Actinobacteria , Bacteroidia , Bacilli , Gammaproteobacteria , Halobacteria , Planctomycetacia , Rhodothermia , and Verrucomicrobiae ) were associated with degradation of CHO compounds, while four bacterial OTUs (affiliated with Actinobacteria, Alphaproteobacteria, Bacteroidia and Gammaproteobacteria ) were highly associated with the degradation of CHOS compounds. Network analysis further revealed that tDOM transformation may be a synergestic process, involving cooperation among multiple species. In summary, our study provides new insights into a microbial role in transforming tDOM in saline lakes and has important implications for understanding the carbon cycle in aquatic environments.

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“…However, there is a growing body of evidence demonstrating that diverse populations of highly specialized or specific bacteria not only survive in hyperarid environments within halite crusts, but also manage to grow and divide (Davila et al, 2008; Wierzchos et al, 2012). More recent evidence also suggests that halotolerant microbial consortia are able to degrade lignocellulose (Cortes-Tolalpa et al, 2018). Future research is therefore recommended to first determine what would be the expected salinity of water in a DGR considering the mixing of infiltrating meteoric water and ancient groundwater and then measure microbial degradation rate of cellulosic material under such salinity.…”

Section: Discussionmentioning

confidence: 99%

Microbial Degradation of Cellulosic Material and Gas Generation: Implications for the Management of Low- and Intermediate-Level Radioactive Waste

Beaton

Pelletier²,

Goulet

2019

Front. Microbiol.

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Deep geologic repositories (DGR) in Canada are designed to contain and isolate low- and intermediate-level radioactive waste. Microbial degradation of the waste potentially produces methane, carbon dioxide and hydrogen gas. The generation of these gases increase rock cavity pressure and limit water ingress which delays the mobility of water soluble radionuclides. The objective of this study was to measure gas pressure and composition over 7 years in experiments containing cellulosic material with various starting conditions relevant to a DGR and to identify micro-organisms generating gas. For this purpose, we conducted experiments in glass bottles containing (1) wet cellulosic material, (2) wet cellulosic material with compost Maker, and (3) wet cellulosic material with compost Accelerator. Results demonstrated that compost accelerated the pressure build-up in the containers and that methane gas was produced in one experiment with compost and one experiment without compost because the pH remained neutral for the duration of the 464 days experiment. Methane was not formed in the other experiment because the pH became acidic. Once the pressure became similar in all containers after 464 days, we then monitored gas pressure and composition in glass bottle containing wet cellulosic material in (1) acidic conditions, (2) neutral conditions, and (3) with an enzyme that accelerated degradation of cellulose over 1965 days. In these experiments, acetogenic bacteria degraded cellulose and produced acetic acid, which acidity suppressed methane production. Microbial community analyses suggested a diverse community of archaea, bacteria and fungi actively degrading cellulose. DNA analyses also confirmed the presence of methanogens and acetogens in our experiments. This study suggests that methane gas will be generated in DGRs if pH remains neutral. However, our results showed that microbial degradation of cellulose not only generated gas, but also generated acidity. This finding is important as acids can limit bentonite swelling and potentially degrade cement and rock barriers, thus this requires consideration in the safety case as appropriate.

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Halotolerant microbial consortia able to degrade highly recalcitrant plant biomass substrate

Cited by 54 publications

References 48 publications

Responses of Soil Microbial Activity to Swine Manure Applications

Responses of Soil Microbial Activity to Swine Manure Applications

Potential utilization of terrestrially derived dissolved organic matter by aquatic microbial communities in saline lakes

Microbial Degradation of Cellulosic Material and Gas Generation: Implications for the Management of Low- and Intermediate-Level Radioactive Waste

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