Arsenic-resistant and plant growth-promoting<i>Firmicutes</i>and γ-<i>Proteobacteria</i>species from industrially polluted irrigation water and corresponding cropland

Qamar, Nayab; Rehman, Yasir; Hasnain, Shahida

doi:10.1111/jam.13535

Cited by 39 publications

(16 citation statements)

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“…This phenomenon has been found in many studies. For instance, most of Gamma-proteobacteria are found to be resistant to heavy metals [26,27]; some Rhizobiales…”

Section: Discussionmentioning

confidence: 99%

“…This phenomenon has been found in many studies. For instance, most of Gamma-proteobacteria are found to be resistant to heavy metals [26,27]; some Rhizobiales belong to halophilic bacteria [28]; Acidithiobacillaceae and Methylobacterium are well known for being able to live in environments containing a high level of metal ions [29][30][31]. So, it is reasonable to detect these microbes in low Cd treatment for their resistance to environmental pressure.…”

Section: Discussionmentioning

confidence: 99%

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The Dysbiosis of Gut Microbiota Caused by Low-Dose Cadmium Aggravate the Injury of Mice Liver through Increasing Intestinal Permeability

Liu

Xia

et al. 2020

Microorganisms

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Cadmium (Cd), widely present in food and drinking water at low doses, can cause health risks. However, the mechanistic effects of long-term Cd exposure at low dose through dietary intake is poorly studied. The aim of this study is to elucidate whether the dysbiosis of gut microbiota caused by Cd at an environmental low dose can aggravate the injury of mice liver, and the possible mechanism is investigated. In order to explore the potential underlying mechanism, the analyses of the variation of gut microbiota composition, intestinal permeability, and hepatic transcriptome were conducted. Our results showed that gut microbiota was disturbed. The rise of intestinal permeability induced by the dysbiosis of gut microbiota resulted in more Cd ions accumulating in mice liver, but it could be restored partly through depleting gut microbiota by antibiotics cocktail. Transcriptomic analyses indicated that 162 genes were significantly differentially expressed including 59 up-regulated and 103 down-regulated in Cd treatment. These genes were involved in several important pathways. Our findings provide a better understanding about the health risks of cadmium in the environment.

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“…This phenomenon has been found in many studies. For instance, most of Gamma-proteobacteria are found to be resistant to heavy metals [26,27]; some Rhizobiales…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The Dysbiosis of Gut Microbiota Caused by Low-Dose Cadmium Aggravate the Injury of Mice Liver through Increasing Intestinal Permeability

Liu

Xia

et al. 2020

Microorganisms

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“…Of these, Agrobacterium , Bacillus , and Pseudomonas species have previously been reported as metal-resistant endophytes in other As-contaminated sites [ 29 – 31 ]. Arsenite-resistant Stenotrophomonas strains have been isolated from As-contaminated soil and water [ 32 ], but, to our knowledge, endophytic arsenite-resistant Stenotrophomonas and Rhodococcus have not been isolated earlier. Most of the representative isolates belonged to Agrobacterium (phylum Proteobacteria ) and Bacillus (phylum Firmicutes ).…”

Section: Discussionmentioning

confidence: 99%

Genetic diversity and characterization of arsenic-resistant endophytic bacteria isolated from Pteris vittata, an arsenic hyperaccumulator

Wang

Sun

et al. 2018

BMC Microbiol

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BackgroundAlleviating arsenic (As) contamination is a high-priority environmental issue. Hyperaccumulator plants may harbor endophytic bacteria able to detoxify As. Therefore, we investigated the distribution, diversity, As (III) resistance levels, and resistance-related functional genes of arsenite-resistant bacterial endophytes in Pteris vittata L. growing in a lead-zinc mining area with different As contamination levels.ResultsA total of 116 arsenite-resistant bacteria were isolated from roots of P. vittata with different As concentrations. Based on the 16S rRNA gene sequence analysis of representative isolates, the isolates belonged to Proteobacteria, Actinobacteria, and Firmicutes. Major genera found were Agrobacterium, Stenotrophomonas, Pseudomonas, Rhodococcus, and Bacillus. The most highly arsenite-resistant bacteria (minimum inhibitory concentration > 45 mM) were isolated from P. vittata with high As concentrations and belonged to the genera Agrobacterium and Bacillus. The strains with high As tolerance also showed high levels of indole-3-acetic acid (IAA) production and carried arsB/ACR3(2) genes. The arsB and ACR3(2) were most likely horizontally transferred among the strains.ConclusionThe results of this study suggest that P. vittata plants with high As concentrations may select diverse arsenite-resistant bacteria; this diversity might, at least partly, be a result of horizontal gene transfer. These diverse endophytic bacteria are potential candidates to enhance phytoremediation techniques.

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Section: Introductionmentioning

confidence: 99%

“…The genus Klebsiella embeds different Gram-negative rod shaped bacteria including human pathogens [ 1 ], harmless nitrogen–fixing plant endosymbionts [ 2 ], and polluted soil inhabitants [ 3 , 4 ]. Klebsiella oxytoca (formerly known as Klebsiella pneumoniae or Aerobacter aerogenes ) is a free-living bacterium isolated from soils [ 3 ], plants and animals, including humans. K. oxytoca strains can be either pathogenic [ 5 ] or beneficial having roles, for instance, as plant growth promoters [ 3 , 6 ] and as valuable biochemical-compound producers [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Genomic traits of Klebsiella oxytoca DSM 29614, an uncommon metal-nanoparticle producer strain isolated from acid mine drainages

et al. 2018

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BackgroundKlebsiella oxytoca DSM 29614 - isolated from acid mine drainages - grows anaerobically using Fe(III)-citrate as sole carbon and energy source, unlike other enterobacteria and K. oxytoca clinical isolates. The DSM 29614 strain is multi metal resistant and produces metal nanoparticles that are embedded in its very peculiar capsular exopolysaccharide. These metal nanoparticles were effective as antimicrobial and anticancer compounds, chemical catalysts and nano-fertilizers.ResultsThe DSM 29614 strain genome was sequenced and analysed by a combination of in silico procedures. Comparative genomics, performed between 85 K. oxytoca representatives and K. oxytoca DSM 29614, revealed that this bacterial group has an open pangenome, characterized by a very small core genome (1009 genes, about 2%), a high fraction of unique (43,808 genes, about 87%) and accessory genes (5559 genes, about 11%). Proteins belonging to COG categories “Carbohydrate transport and metabolism” (G), “Amino acid transport and metabolism” (E), “Coenzyme transport and metabolism” (H), “Inorganic ion transport and metabolism” (P), and “membrane biogenesis-related proteins” (M) are particularly abundant in the predicted proteome of DSM 29614 strain. The results of a protein functional enrichment analysis - based on a previous proteomic analysis – revealed metabolic optimization during Fe(III)-citrate anaerobic utilization. In this growth condition, the observed high levels of Fe(II) may be due to different flavin metal reductases and siderophores as inferred form genome analysis. The presence of genes responsible for the synthesis of exopolysaccharide and for the tolerance to heavy metals was highlighted too. The inferred genomic insights were confirmed by a set of phenotypic tests showing specific metabolic capability in terms of i) Fe2+ and exopolysaccharide production and ii) phosphatase activity involved in precipitation of metal ion-phosphate salts.ConclusionThe K. oxytoca DSM 29614 unique capabilities of using Fe(III)-citrate as sole carbon and energy source in anaerobiosis and tolerating diverse metals coincides with the presence at the genomic level of specific genes that can support i) energy metabolism optimization, ii) cell protection by the biosynthesis of a peculiar exopolysaccharide armour entrapping metal ions and iii) general and metal-specific detoxifying activities by different proteins and metabolites.Electronic supplementary materialThe online version of this article (10.1186/s12866-018-1330-5) contains supplementary material, which is available to authorized users.

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Arsenic-resistant and plant growth-promotingFirmicutesand γ-Proteobacteriaspecies from industrially polluted irrigation water and corresponding cropland

Abstract: The bacteria capable of both As detoxification and plant growth promotion, such as A. lwoffii T24 and C. freundii N52, are ideal for remediation and reclamation of polluted lands for agriculture purposes.

Cited by 39 publications

References 20 publications

The Dysbiosis of Gut Microbiota Caused by Low-Dose Cadmium Aggravate the Injury of Mice Liver through Increasing Intestinal Permeability

The Dysbiosis of Gut Microbiota Caused by Low-Dose Cadmium Aggravate the Injury of Mice Liver through Increasing Intestinal Permeability

Genetic diversity and characterization of arsenic-resistant endophytic bacteria isolated from Pteris vittata, an arsenic hyperaccumulator

Genomic traits of Klebsiella oxytoca DSM 29614, an uncommon metal-nanoparticle producer strain isolated from acid mine drainages

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