Bacterial adaptive strategies to cope with metal toxicity in the contaminated environment – A review

Ecotoxicology and Environmental Safety, Journal Year: 2021, Volume and Issue: 226, P. 112863 - 112863

Published: Oct. 5, 2021

Heavy metal contamination poses a serious environmental hazard, globally necessitating intricate attention. metals can cause deleterious health hazards to humans and other living organisms even at low concentrations. Environmental biotechnologists eco-toxicologists have rigorously assessed plethora of bioremediation mechanisms that hamper the toxic outcomes molecular basis for rejuvenating hazardous impacts, optimistically. impact assessment restoration native positive scenario has compelled biological management in ensuring safety replenishment polluted realms often hindered by heavy toxicity. Copious treatment modalities been corroborated mitigate detrimental effects remove from sites. In particular, Biological-based methods are great attention removal sector due their high efficiency concentrations, ecofriendly nature, cost-effectiveness. Due rapid multiplication growth rates, bacteria having resistance advocated applications. Evolutionary implications coping with toxicity redressed bacterial adaptive/resistance strategies related physiological cross-protective mechanisms. Ample reviews reported adaptive cope Nevertheless, holistic review summarizing redox reactions address cross-reactivity between metallothionein synthesis, extracellular polysaccharides production, siderophore efflux systems resistant scarce. Molecular dissection how adapt themselves augment novel innovative technologies efficient detoxification, removal, combat restorative difficulties stress alleviations. The present comprehensive compilation addresses identification newer methodologies, prevailing bioremediation. Further pitfalls respective future directions enumerated invigorating effective including overexpression studies delivery systems. analysis will aid abridging gap limitations necessary cross-talk elucidating complex cascade events better protocols.

Language: Английский

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Cofunctioning of bacterial exometabolites drives root microbiota establishment

Proceedings of the National Academy of Sciences, Journal Year: 2023, Volume and Issue: 120(15)

Published: April 5, 2023

Soil-dwelling microbes are the principal inoculum for root microbiota, but our understanding of microbe-microbe interactions in microbiota establishment remains fragmentary. We tested 39,204 binary interbacterial inhibitory activities vitro, allowing us to identify taxonomic signatures bacterial inhibition profiles. Using genetic and metabolomic approaches, we identified antimicrobial 2,4-diacetylphloroglucinol (DAPG) iron chelator pyoverdine as exometabolites whose combined functions explain most activity strongly antagonistic Pseudomonas brassicacearum R401. Microbiota reconstitution with a core Arabidopsis thaliana commensals presence wild-type or mutant strains revealed niche-specific cofunction these competence determinants drivers predictable changes root-associated community. In natural environments, both corresponding biosynthetic operons enriched roots, pattern likely linked their role sinks, indicating that cofunctioning adaptive traits contributing pseudomonad pervasiveness throughout microbiota.

Language: Английский

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Siderophores and metallophores: Metal complexation weapons to fight environmental pollution

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 932, P. 173044 - 173044

Published: May 8, 2024

Siderophores are small molecules of organic nature, released by bacteria to chelate iron from the surrounding environment and subsequently incorporate it into cytoplasm. In addition iron, these secondary metabolites can complex with a wide variety metals, which is why they commonly studied in environment. Heavy metals be very toxic when present large amounts on planet, affecting public health all living organisms. The pollution caused increasing, therefore urgent find practical, sustainable, economical solutions for remediation. One strategies siderophore-assisted bioremediation, an innovative advantageous alternative various environmental applications. This research highlights uses siderophores metallophores environment, underscoring their significance ecosystems. study delves utilization both marine terrestrial settings (e.g. biocontrol pathogens, plant growth promotion), such as promotion, providing context different instances outlined existing literature highlighting relevance each field. structures types focusing singular characteristics application methodologies used. Focusing recent developments over last two decades, opportunities challenges associated applications were mapped arm researchers fight against pollution.

Language: Английский

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Microbial siderophore – A boon to agricultural sciences

Biological Control, Journal Year: 2020, Volume and Issue: 144, P. 104214 - 104214

Published: Jan. 31, 2020

Language: Английский

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Plant Growth-Promoting Rhizobacteria: Diversity and Applications

Springer eBooks, Journal Year: 2018, Volume and Issue: unknown, P. 129 - 173

Published: Dec. 6, 2018

Language: Английский

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Actinobacteria from Extreme Niches in Morocco and Their Plant Growth-Promoting Potentials

Diversity, Journal Year: 2019, Volume and Issue: 11(8), P. 139 - 139

Published: Aug. 20, 2019

The objectives of this study were to assess actinobacterial diversity in five Moroccan extreme habitats and evaluate their plant growth-promoting (PGP) activities. soil samples collected from different locations, including soils contaminated with heavy metals, a high altitude site, the desert, marine environment. In total, 23 actinobacteria isolated, 8 Merzouga sand soil; 5 Cannabis sativa rhizospheric Toubkal mountain; 4 Draa sfar mining site; 1 soil. Based on genotypic classification using 16S rRNA gene sequences, 19 all belonged genus Streptomyces (82%) while rest are members genera Nocardioides (4.5%), Saccharomonospora Actinomadura Prauserella (4.5%). Isolates sp. TNC-1 MNC-1 showed highest level phosphorus solubilization activity 12.39 8.56 mg/mL, respectively. All isolates able solubilize potassium, 91% them could grow under nitrogen-free conditions. ability isolated form indole-3-acetic acid (IAA) ranged 6.70 75.54 μg/mL being best IAA producer. addition, produce siderophores, LNS-1 synthesizing greatest amount (138.92 μg/mL). Principal coordinate analysis revealed that spp. MNC-1, MNT-1, MNB-2, KNC-5; LNS-1; KNC-3 each variety high-level environments Morocco rich bioactive possess potentials can further benefit green sustainable agriculture.

Language: Английский

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Phosphate-solubilizing Bacillus sp. enhances growth, phosphorus uptake and oil yield of Mentha arvensis L

3 Biotech, Journal Year: 2019, Volume and Issue: 9(4)

Published: March 6, 2019

Language: Английский

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Endophytic Bacteria Potentially Promote Plant Growth by Synthesizing Different Metabolites and their Phenotypic/Physiological Profiles in the Biolog GEN III MicroPlateTM Test

International Journal of Molecular Sciences, Journal Year: 2019, Volume and Issue: 20(21), P. 5283 - 5283

Published: Oct. 24, 2019

Endophytic bacteria, as the most promising components of effective, biofertilizers biostimulating and biocontrol preparations, should be very intensively obtained from various plants studied in terms conditions determining potential ability to promote plant growth. For this reason, endophytic bacteria have been isolated both stems roots up six systematically distant species vascular plants: one belonging seedless (Monilophyta), five seed (Spermatophyta). The 23 strains represented nine genera: Delftia, Stenotrophomonas, Rhizobium, Brevundimonas, Variovorax, Achromobacter, Novosphingobium, Comamonas Collimonas, notably which were closely related—belonging phylum Proteobacteria. Stenotrophomonas sp. showed greatest synthesize indole-3-acetic acid (IAA)-like compounds, while Achromobacter produced highest levels siderophores. presence nifH gene nitrogen binding activity was demonstrated for 95% tested. maltophila (ES2 strain) metabolic based on Biolog GEN III test. solubilize phosphate determined only three tested genus: Rhizobium Novosphingobium. presented work that phenotypic properties growth-promoting endophytes are correlated with genus not host or part (stem, root).

Language: Английский

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Mechanisms of halotolerant plant growth promoting Alcaligenes sp. involved in salt tolerance and enhancement of the growth of rice under salinity stress

3 Biotech, Journal Year: 2020, Volume and Issue: 10(8)

Published: July 30, 2020

Language: Английский

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Cyanobacterial Siderophores—Physiology, Structure, Biosynthesis, and Applications

Marine Drugs, Journal Year: 2019, Volume and Issue: 17(5), P. 281 - 281

Published: May 10, 2019

Siderophores are low-molecular-weight metal chelators that function in microbial iron uptake. As limits primary productivity many environments, siderophores of great ecological importance. Additionally, their binding properties have attracted interest for uses medicine and bioremediation. Here, we review the current state knowledge concerning produced by cyanobacteria. We give an overview all cyanobacterial species with known siderophore production, finding but most basal clades, a wide variety environments. explore what is about structure, biosynthesis, cycling been characterized: Synechobactin, schizokinen anachelin. also highlight alternative functionality technological potential, allelopathic effects on competing phytoplankton likely roles limiting heavy-metal toxicity. Methodological improvements characterization detection briefly described. Since not structurally characterized, application mass spectrometry techniques will reveal breadth variation within these important molecules.

Language: Английский

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