Mechanisms of stress avoidance and tolerance by plants used in phytoremediation of heavy metals

Jutsz, Anna Małachowska; Gnida, Anna

doi:10.1515/aep-2015-0045

Cited by 49 publications

(18 citation statements)

References 74 publications

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“…Phytoextraction involves the uptake and movement of metal pollutants in the soil through plant roots into above-ground components of the plants, based on the mechanism of hyperaccumulation [ 92 ]. Hyperaccumulator plants take up metals in large quantities from contaminated soils, then transport and accumulate them in organs above the ground at concentrations from 100 to 1000 times higher than those found in non-hyperaccumulating species without suffering any apparent phytotoxic effect [ 93 , 94 ], hence they are very suitable for phytoremediation.…”

Section: Phytoremediationmentioning

confidence: 99%

“…These suggestions made by Tak et al [ 4 ] are indispensable as they will give researchers the ability to use the appropriate hyperaccumulating plants to obtain the best results in phytoremediation of polluted environments. The efficiency of phytoextraction is based on several factors which include: (a) the choice of plant used, (b) the degree of plant tolerance to higher concentrations of heavy metals and (c) the capacity of plants to drastically take up heavy metals and move them from the roots to exposed surfaces which are essential for the phytoextraction process [ 92 ]. Phytoextraction can be commercially viable; besides removal of heavy metals from the soil, it also produces biomass with added value [ 101 , 107 ].…”

Section: Phytoremediationmentioning

confidence: 99%

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Microbial and Plant-Assisted Bioremediation of Heavy Metal Polluted Environments: A Review

Ojuederie

Babalola

2017

IJERPH

729

210

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Environmental pollution from hazardous waste materials, organic pollutants and heavy metals, has adversely affected the natural ecosystem to the detriment of man. These pollutants arise from anthropogenic sources as well as natural disasters such as hurricanes and volcanic eruptions. Toxic metals could accumulate in agricultural soils and get into the food chain, thereby becoming a major threat to food security. Conventional and physical methods are expensive and not effective in areas with low metal toxicity. Bioremediation is therefore an eco-friendly and efficient method of reclaiming environments contaminated with heavy metals by making use of the inherent biological mechanisms of microorganisms and plants to eradicate hazardous contaminants. This review discusses the toxic effects of heavy metal pollution and the mechanisms used by microbes and plants for environmental remediation. It also emphasized the importance of modern biotechnological techniques and approaches in improving the ability of microbial enzymes to effectively degrade heavy metals at a faster rate, highlighting recent advances in microbial bioremediation and phytoremediation for the removal of heavy metals from the environment as well as future prospects and limitations. However, strict adherence to biosafety regulations must be followed in the use of biotechnological methods to ensure safety of the environment.

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Section: Phytoremediationmentioning

confidence: 99%

Section: Phytoremediationmentioning

confidence: 99%

Microbial and Plant-Assisted Bioremediation of Heavy Metal Polluted Environments: A Review

Ojuederie

Babalola

2017

IJERPH

729

210

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“…In year 1, shoot Cu concentrations varied from 5 to 68 mg kg −1 for the OMDL plants (Kolbas et al, 2011). Lowest shoot Cu concentrations of the OM2DL plants could be related to (1) soil factors, e.g., low Cu availability, high soil CEC, and higher total N, Ca, organic matter and water contents in the OM2DL soils (Figure 4, Table 3), and (2) plant factors, i.e., Cu dilution into the shoot biomass as for Fe (Table 4) and high shoot K, Zn, and Mn concentrations helping likely to regulate ion cellular homeostasis (Table 4; Figure S8, Malachowska-Jutsz and Gnida, 2015;Printz et al, 2016). For lettuce in year 6, shoot Cu concentration was also lower in the OM2DL plants than in the OMDL and Unt ones (Quintela-Sabarís et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Phytomanagement and Remediation of Cu-Contaminated Soils by High Yielding Crops at a Former Wood Preservation Site: Sunflower Biomass and Ionome

et al. 2018

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This long-term field trial aimed at remediating a Cu-contaminated soil to promote crop production and soil functions at a former wood preservation site. Twenty-eight field plots with total topsoil Cu in the 198-1,169 mg kg −1 range were assessed. Twenty-four plots (OMDL) were amended in 2008 with a compost (made of pine bark chips and poultry manure, OM, 5% w/w) and dolomitic limestone (DL, 0.2%), and thereafter annually phytomanaged with a sunflower-tobacco crop rotation. In 2013, one untreated plot (UNT) was amended with a green waste compost (GW, 5%) whereas 12 former OMDL plots received a second compost dressing using this green waste compost (OM2DL, 5%). In 2011, one plot was amended with the Carmeuse basic slag (CAR, 1%) and another plot with a P-spiked Linz-Donawitz basic slag (PLD, 1%). Thus six soil treatments, i.e., UNT, OMDL, OM2DL, GW, CAR, and PLD, were cultivated in 2016 with sunflower (Helianthus annuus L. cv Ethic). Shoots were harvested and their ionome analyzed. At high soil Cu contamination, the 1M NH 4 NO 3-extractable vs. total soil Cu ratio ranked in decreasing order: Unt (2.35) > CAR (1.02), PLD (0.83) > GW (0.58), OMDL (0.44), OM2DL (0.37), indicating a lower Cu extractability in the compost-amended plots. All amendments improved the soil nutrient status and the soil pH, which was slightly acidic in the UNT soil. Total organic C and N and extractable P contents peaked in the OM2DL soils. Both OMDL and OM2DL treatments led to higher shoot DW yields and Cu removals than the GW, CAR, and PLD treatments. Shoot DW yields decreased as total topsoil Cu rose in the OMDL plots, on the contrary to the OM2DL plots, demonstrating the benefits to repeat compost application after 5 years. Shoot Cu concentrations notably of OMDL and OM2DL plants fitted into their common range and can be used by biomass Mench et al. Phytomanagement of Cu-Contaminated Soils processing technologies and oilseeds as well. In overall, there is a net gain in soil physico-chemical properties and underlying soil functions. HIGHLIGHTS-Compost incorporated into Cu-contaminated soils improves the sunflower growth.-Soil organic matter increases in compost-amended soils.-Extractable soil Cu decreases in compost-amended soils.-Shoot Cu removal by sunflower reaches 26-88 g Cu ha −1 year −1 .

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“…The metal avoidance in plants such as A. rubrum is associated with morphological changes at the root system and likely involves auxins (Cai et al, 2011;Khare et al, 2017;Liu et al, 2011;Overvoorde, Fukaki, & Beeckman, 2010;Potters et al, 2007;Vitti et al, 2014). Plants also limit metal assimilation by the roots by secreting a number of substances such as organic acids, and substances in root extracellular matrix such as sugars, phenols, amino acids, and polysaccharides (Cai et al, 2011;Guo, Liang, & Zhu, 2009;Jutsz & Gnida, 2015). The mechanism used by A. rubrum to avoid nickel is unclear, but considering that the nickel treatment was conducted in a controlled environment using a sterilized sand / soil mix, it is likely that the avoidance mechanism is in situ.…”

Section: Gene Expression and Ontology Analysesmentioning

confidence: 99%

Differential levels of gene expression and molecular mechanisms between red maple (Acer rubrum) genotypes resistant and susceptible to nickel toxicity revealed by transcriptome analysis

Nkongolo

Theriault

Paul

2018

Ecology and Evolution

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Knowledge of regulation of genes associated with metal resistance in higher plants is very limited. Many plant species have developed different genetic mechanisms and metabolic pathways to cope with metal toxicity. The main objectives of this study were to 1) assess gene expression dynamics of A. rubrum in response to nickel (Ni) stress and 2) describe gene function based on ontology. Certified A. rubrum genotypes were treated with 1,600 mg of Ni per 1 Kg of soil corresponding to a soil total nickel content in a metal‐contaminated region in Ontario, Canada. Nickel resistant and susceptible genotypes were selected and used for transcriptome analysis. Overall, 223,610,443 bases were generated. Trinity reads were assembled to trinity transcripts. The transcripts were mapped to protein sequences and after quality controls and appropriate trimmings, 66,783 annotated transcripts were selected as expressed among the libraries. The study reveals that nickel treatment at a high dose of 1,600 mg/kg triggers regulation of several genes. When nickel‐resistant genotypes were compared to water controls, 6,263 genes were upregulated and 3,142 were downregulated. These values were 3,308 and 2,176, respectively, when susceptible genotypes were compared to water control. The coping mechanism of A. rubrum to Ni toxicity was elucidated. Upregulation of genes associated with transport in cytosol was prevalent in resistant genotypes compared to controls while upregulation of genes associated with translation in the ribosome was higher in susceptible genotypes when compared to water. The analysis revealed no major gene associated with Ni resistance in A. rubrum. Overall, the results of this study suggest that the genetic mechanism controlling the resistance of this species to nickel is controlled by genes with limited expression. The subtle differences between resistant and susceptible genotypes in gene regulation were detected using water‐treated genotypes as references.

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Mechanisms of stress avoidance and tolerance by plants used in phytoremediation of heavy metals

Cited by 49 publications

References 74 publications

Microbial and Plant-Assisted Bioremediation of Heavy Metal Polluted Environments: A Review

Microbial and Plant-Assisted Bioremediation of Heavy Metal Polluted Environments: A Review

Phytomanagement and Remediation of Cu-Contaminated Soils by High Yielding Crops at a Former Wood Preservation Site: Sunflower Biomass and Ionome

Differential levels of gene expression and molecular mechanisms between red maple (Acer rubrum) genotypes resistant and susceptible to nickel toxicity revealed by transcriptome analysis

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