Bacterial mediated alleviation of heavy metal stress and decreased accumulation of metals in plant tissues: Mechanisms and future prospects

Etesami, Hassan

doi:10.1016/j.ecoenv.2017.08.032

Cited by 439 publications

(159 citation statements)

References 188 publications

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“…In another study, after inoculation of Pb‐tolerant bacteria expressing ACC deaminase, a significant increase in Brassica napus root and shoot biomass was found . This evidence was observed in several studies of heavy metal‐contaminated soils after inoculation of PGPB, confirming the possitive influence of ACC deaminase enzyme in tolerant bacteria . Morever, some authors have suggested that exopolysaccarides produced by bacteria have an important role in bacterial tolerance to heavy metals; for example, Pseudomonas putida binds 100% of Cd in solution owing to these compounds .…”

Section: Introductionmentioning

confidence: 65%

“…20 This evidence was observed in several studies of heavy metal-contaminated soils after inoculation of PGPB, confirming the possitive influence of ACC deaminase enzyme in tolerant bacteria. 21,22 Morever, some authors have suggested that exopolysaccarides produced by bacteria have an important role in bacterial tolerance to heavy metals; 22 for example, Pseudomonas putida binds 100% of Cd in solution owing to these compounds. 23 Some PGPB in Fe-deficient environments produce siderophores that can improve many-fold the Fe complexes absorbed by plants.…”

Section: Introductionmentioning

confidence: 99%

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Consortium of plant growth‐promoting bacteria improves spinach (Spinacea oleracea L.) growth under heavy metal stress conditions

Shilev

Babrikova

Babrikov

2019

J of Chemical Tech & Biotech

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BACKGROUND Heavy metal contamination results in oxidative stress to plants and leads to decreased plant growth and development. Affected plants cannot be efficiently used in phytoremediation studies and their potential may be significantly reduced. In many cases, bioaugmentation with plant growth‐promoting bacteria is used as a strategy to alleviate this stress condition. RESULTS Isolates were found to possess 1‐aminocyclopropane‐1‐carboxylate (ACC) deaminase, to produce indole‐3‐acetic acid (IAA) siderophores and to solubilize phosphates, while identification revealed that the isolates belonged to the genera Pseudomonas and Bacillus. Out of the 17 isolates, ten were found to possess ACC deaminase activity, producing 1–3.2 μmol mg−1 h−1 of α‐ketobutyrate and siderophores of catechol and hydroxamate type. A higher quantity of IAA was observed in the case of isolate SGPI 41 (65 μg mL−1). In addition, the inoculation of consortia of isolates led to decreased accumulation of Cd, Pb and Zn in the whole plant but at the same time increased the plant biomass by up to 100% compared with the un‐inoculated control. CONCLUSIONS The use of beneficial bacteria possessing plant growth‐promoting traits is a very useful approach to alleviating heavy metal stress to plants and can be successfully applied in phytoremediation strategies. © 2019 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Consortium of plant growth‐promoting bacteria improves spinach (Spinacea oleracea L.) growth under heavy metal stress conditions

Shilev

Babrikova

Babrikov

2019

J of Chemical Tech & Biotech

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“…The imbalance in physiological activities occurs mainly because of the generation of excess reactive oxygen species (ROS) induced by toxic metals [26,27]. In order to scavenge ROS and avoid oxidative stress, plants produce and activate different antioxidant enzymes like catalase (CAT), phenylalanine ammonialyase (PAL) and polyphenol oxidase (PPO) as a defense mechanism [28]. Like antioxidant enzymes, soluble proteins also play an important role in plant defense system by regulating the osmotic balance, stabilizing macromolecules, quenching ROS and preventing oxidative damage, and thereby are considered as bioindicators of metal stress [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Phytostabilization of Pb-Zn Mine Tailings with Amorpha fruticosa Aided by Organic Amendments and Triple Superphosphate

et al. 2020

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A greenhouse pot trial was conducted to investigate the effect of organic amendments combined with triple superphosphate on the bioavailability of heavy metals (HMs), Amorpha fruticosa growth and metal uptake from Pb-Zn mine tailings. Cattle manure compost (CMC), spent mushroom compost (SMC) and agricultural field soil (AFS) were applied to tailings at 5%, 10%, 20% and 30% w/w ratio, whereas sewage sludge (SS) and wood biochar (WB) were mixed at 2.5%, 5%, 10% and 20% w/w ratio. Triple superphosphate (TSP) was added to all the treatments at 4:1 (molar ratio). Amendments efficiently decreased DTPA-extracted Pb, Zn, Cd and Cu in treatments. Chlorophyll contents and shoot and root dry biomass significantly (p < 0.05) increased in the treatments of CMC (except T4 for chlorophyll b) and SMC, whereas treatments of SS (except T1 for chlorophyll a and b), WB and AFS (except T4 for chlorophyll a and b) did not show positive effects as compared to CK1. Bioconcentration factor (BCF) and translocation factor (TF) values in plant tissues were below 1 for most treatments. In amended treatments, soluble protein content increased, phenylalanine ammonialyase (PAL) and polyphenol oxidase (PPO) decreased, and catalase (CAT) activity showed varied results as compared to CK1 and CK2. Results suggested that A. fruticosa can be a potential metal phytostabilizer and use of CMC or SMC in combination with TSP are more effective than other combinations for the in situ stabilization of Pb-Zn mine tailings.

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“…The discharge of heavy metals into the environment without any prior treatment is diminishing the water quality to frightening levels, thereby posing its lethal effect on to the living organisms (Martin, Turnbull, Rissmann, & Rieger, 2017). Heavy metals tend to accumulate and concentrate in the living tissues through the food chain, imposing its adverse impact on human health (Etesami, 2018). Henceforth, treatment of wastewater containing heavy metals prior to their discharge is mandatory due to the increasingly restrictive legislation (Arul Manikandan, Alemu, Goswami, Pakshirajan, & Pugazhenthi, 2016).…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of floating and submerged macrophytes for heavy metal (copper, chromium, arsenic and lead) removal: sorbent preparation, characterization, regeneration and cost estimation

Bind¹,

Goswami²,

Prakash³

2018

Geology, Ecology, and Landscapes

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In this study, a comparative evaluation of floating and submerged macrophytes was performed. Azolla filiculoides (free floating) and Hydrilla verticillata (submerged) aquatic macrophytes were utilized for arsenic, copper, chromium and lead removal from the respective metallic ion solutions. Batch experiments were performed initially with optimization of different physical parameters viz., pH, initial heavy metal concentration, biosorbent dosage, contact time, temperature and agitation speed. Submerged (Hydrilla verticillata) had depicted better removal efficiency in comparison to the floating macrophyte (Azolla filiculoides). Field emission scanning electron microscopy equipped with energy dispersive spectroscopy and Fourier transform infrared spectroscopy analysis was performed for the characterization of the metal loaded biosorbents. Biosorption of the respective heavy metal was clearly depicted in the FESEM-EDX spectrum, although not much change in the morphology of the biosorbents were examined. FTIR spectra of the biosorbents obtained after the experiments confirmed the involvement of C-H bend, -CH 2 -(C=O), N-H, -C-O, R 2 -C= bending and -C-C=O on the biomass. Furthermore, the biosorbent regeneration followed by heavy metal biosorption confirmed the reusability of the prepared biosorbent for at least two consecutive cycles without much significant change in the heavy metal biosorption capacity.

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Bacterial mediated alleviation of heavy metal stress and decreased accumulation of metals in plant tissues: Mechanisms and future prospects

Cited by 439 publications

References 188 publications

Consortium of plant growth‐promoting bacteria improves spinach (Spinacea oleracea L.) growth under heavy metal stress conditions

Consortium of plant growth‐promoting bacteria improves spinach (Spinacea oleracea L.) growth under heavy metal stress conditions

Phytostabilization of Pb-Zn Mine Tailings with Amorpha fruticosa Aided by Organic Amendments and Triple Superphosphate

Comparative analysis of floating and submerged macrophytes for heavy metal (copper, chromium, arsenic and lead) removal: sorbent preparation, characterization, regeneration and cost estimation

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