Haloarchaea, excellent candidates for removing pollutants from hypersaline wastewater

Li, Jin; Gao, Yixiao; Dong, Huiyu; Sheng, Guo‐Ping

doi:10.1016/j.tibtech.2021.06.006

Cited by 30 publications

(13 citation statements)

References 76 publications

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“…This is characteristic of the well-known rhizosphere effect for bacteria ( 35 ), which is sparsely explored and not well understood for archaea ( 36 , 37 ). The enrichment included specific bacterial taxa, i.e., Halobacteria , Halomonas , and Marinobacter , that were previously reported to be beneficial for plants in terms of increasing their tolerance to drought and salt stress ( 36 , 38 , 39 ). These taxa likely originated from the hypersaline body of water in the Aral Sea and were recruited to support plant growth specifically under high-salinity conditions.…”

Section: Discussionmentioning

confidence: 99%

Function-Based Rhizosphere Assembly along a Gradient of Desiccation in the Former Aral Sea

et al. 2022

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The desertification of the Aral Sea basin in Uzbekistan and Kazakhstan represents one of the most serious anthropogenic environmental disasters of the last century. Since the 1960s, the world's fourth-largest inland body of water has been constantly shrinking, which has resulted in an extreme increase of salinity accompanied by accumulation of many hazardous and carcinogenic substances, as well as heavy metals, in the dried-out basin.

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Section: Discussionmentioning

confidence: 99%

Function-Based Rhizosphere Assembly along a Gradient of Desiccation in the Former Aral Sea

et al. 2022

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“…Together with the Halobacteria described above, other denitrifying archaea were detected ( nirk gene sequencing): Halohasta , Natrinema , Halorussus , Natronolimnobius , Halorubrum , Halorhabdus , and Haloarcula . The denitrifying capacities of these haloarchaea were recently reviewed in relation to removal of pollutants from wastewater (Li et al, 2022 ). The denitrifying Chryseobacterium was only found in sample IC9, and nitrogen-fixing Cyanobacteria were very abundant in the wall sample IC7, in which the concentration of salts was highest.…”

Section: Discussionmentioning

confidence: 99%

Long-amplicon MinION-based sequencing study in a salt-contaminated twelfth century granite-built chapel

Pavlović

Bosch-Roig

Rusková

et al. 2022

Appl Microbiol Biotechnol

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The irregular damp dark staining on the stonework of a salt-contaminated twelfth century granite-built chapel is thought to be related to a non-homogeneous distribution of salts and microbial communities. To enhance understanding of the role of microorganisms in the presence of salt and damp stains, we determined the salt content and identified the microbial ecosystem in several paving slabs and inner wall slabs (untreated and previously bio-desalinated) and in the exterior surrounding soil. Soluble salt analysis and culture-dependent approaches combined with archaeal and bacterial 16S rRNA and fungal ITS fragment as well as with the functional genes nirK, dsr, and soxB long-amplicon MinION-based sequencing were performed. State-of-the-art technology was used for microbial identification, providing information about the microbial diversity and phylogenetic groups present and enabling us to gain some insight into the biological cycles occurring in the community key genes involved in the different geomicrobiological cycles. A well-defined relationship between microbial data and soluble salts was identified, suggesting that poorly soluble salts (CaSO4) could fill the pores in the stone and lead to condensation and dissolution of highly soluble salts (Ca(NO3)2 and Mg(NO3)2) in the thin layer of water formed on the stonework. By contrast, no direct relationship between the damp staining and the salt content or related microbiota was established. Further analysis regarding organic matter and recalcitrant elements in the stonework should be carried out. Key points • Poorly (CaSO4) and highly (Ca(NO3)2, Mg(NO3)2) soluble salts were detected • Halophilic and mineral weathering microorganisms reveal ecological impacts of salts • Microbial communities involved in nitrate and sulfate cycles were detected

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“…Biological wastewater treatment has been considered a more economical approach, but mesophilic microorganisms used so far for this purpose can not be used in the biological treatment of polluted brines of wastewater containing high salt concentration. In this context, recent research findings revealed the role of haloarchaea in the treatment of salty wastewater and brine generated as final residues in water desalination plants (Li et al, 2021;Martínez et al, 2022). Haloarchaea can also degrade hydrocarbons; however, their degradation is more efficient for low molecular-weight hydrocarbons.…”

Section: Biotechnological Significance Of Haloarchaeamentioning

confidence: 99%

“…Haloarchaea can also degrade hydrocarbons; however, their degradation is more efficient for low molecular-weight hydrocarbons. The degradation of naphthalene, phenol, p-hydroxybenzoic acid, and 3-phenyl propionic acid, and oxychlorides like perchlorate or chlorate by haloarchaea also make it an attractive choice for wastewater treatment (Martínez-Espinosa et al, 2015;Mukherji et al, 2020;Li et al, 2021). Another interesting approach related to wastewater treatments is the removal of nitrogen to avoid eutrophication in the receiving water bodies and heavy metals to avoid global toxicity.…”

Section: Biotechnological Significance Of Haloarchaeamentioning

confidence: 99%

Bioactive molecules from haloarchaea: Scope and prospects for industrial and therapeutic applications

et al. 2023

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Marine environments and salty inland ecosystems encompass various environmental conditions, such as extremes of temperature, salinity, pH, pressure, altitude, dry conditions, and nutrient scarcity. The extremely halophilic archaea (also called haloarchaea) are a group of microorganisms requiring high salt concentrations (2–6 M NaCl) for optimal growth. Haloarchaea have different metabolic adaptations to withstand these extreme conditions. Among the adaptations, several vesicles, granules, primary and secondary metabolites are produced that are highly significant in biotechnology, such as carotenoids, halocins, enzymes, and granules of polyhydroxyalkanoates (PHAs). Among halophilic enzymes, reductases play a significant role in the textile industry and the degradation of hydrocarbon compounds. Enzymes like dehydrogenases, glycosyl hydrolases, lipases, esterases, and proteases can also be used in several industrial procedures. More recently, several studies stated that carotenoids, gas vacuoles, and liposomes produced by haloarchaea have specific applications in medicine and pharmacy. Additionally, the production of biodegradable and biocompatible polymers by haloarchaea to store carbon makes them potent candidates to be used as cell factories in the industrial production of bioplastics. Furthermore, some haloarchaeal species can synthesize nanoparticles during heavy metal detoxification, thus shedding light on a new approach to producing nanoparticles on a large scale. Recent studies also highlight that exopolysaccharides from haloarchaea can bind the SARS-CoV-2 spike protein. This review explores the potential of haloarchaea in the industry and biotechnology as cellular factories to upscale the production of diverse bioactive compounds.

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Haloarchaea, excellent candidates for removing pollutants from hypersaline wastewater

Cited by 30 publications

References 76 publications

Function-Based Rhizosphere Assembly along a Gradient of Desiccation in the Former Aral Sea

Function-Based Rhizosphere Assembly along a Gradient of Desiccation in the Former Aral Sea

Long-amplicon MinION-based sequencing study in a salt-contaminated twelfth century granite-built chapel

Bioactive molecules from haloarchaea: Scope and prospects for industrial and therapeutic applications

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