Plant Resistance to Anthropogenic Toxicants: Approaches to Phytoremediation

Alizade, Valida M.; Alirzayeva, E. G.; Shirvani, T. S.

doi:10.1007/978-90-481-9370-7_9

Cited by 10 publications

(5 citation statements)

References 96 publications

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“…The rate constant k for the depletion following spike 2 ( C 0 = 36 μg/L) was 8.9 h –1 ( t 1/2 = 0.11 h), between five and 21 times faster than spike 1 kinetics at any of the various concentration levels (note the rate constant units are t –1 because the kinetics are measured in terms of C / C 0 ). The increased rate of MBT loss during the second spike may be due to plant adaptation to the presence of pollutants − resulting in the induction of detoxification-related enzymes and thus increasing transformation capacity. For example, glutathione-S-transferase enzymes are known to be inducible following exposure to xenobiotic compounds .…”

Section: Resultsmentioning

confidence: 99%

Plant Assimilation Kinetics and Metabolism of 2-Mercaptobenzothiazole Tire Rubber Vulcanizers by Arabidopsis

Lefèvre¹,

Portmann

Müller³

et al. 2016

Environ. Sci. Technol.

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2-Mercaptobenzothiazole (MBT) is a tire rubber vulcanizer found in potential sources of reclaimed water where it may come in contact with vegetation. In this work, we quantified the plant assimilation kinetics of MBT using Arabidopsis under hydroponic conditions. MBT depletion kinetics in the hydroponic medium with plants were second order (t1/2 = 0.52 to 2.4 h) and significantly greater than any abiotic losses (>18 times faster; p = 0.0056). MBT depletion rate was related to the initial exposure concentration with higher rates at greater concentrations from 1.6 μg/L to 147 μg/L until a potentially inhibitory level (1973 μg/L) lowered the assimilation rate. 9.8% of the initial MBT mass spike was present in the plants after 3 h and decreased through time. In-source LC-MS/MS fragmentation revealed that MBT was converted by Arabidopsis seedlings to multiple conjugated-MBT metabolites of differential polarity that accumulate in both the plant tissue and hydroponic medium; metabolite representation evolved temporally. Multiple novel MBT-derived plant metabolites were detected via LC-QTOF-MS analysis; proposed transformation products include glucose and amino acid conjugated MBT metabolites. Elucidating plant transformation products of trace organic contaminants has broad implications for water reuse because plant assimilation could be employed advantageously in engineered natural treatment systems, and plant metabolites in food crops could present an unintended exposure route to consumers.

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Section: Resultsmentioning

confidence: 99%

Plant Assimilation Kinetics and Metabolism of 2-Mercaptobenzothiazole Tire Rubber Vulcanizers by Arabidopsis

Lefèvre¹,

Portmann

Müller³

et al. 2016

Environ. Sci. Technol.

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“…This shows that metal removed from the algal growth medium is indeed uptake and accumulated in Microalgae are widely known to remove heavy metals from polluted waters by two major mechanisms. 62 The first is a rapid non-active adsorption of free metals ions to the microalgae the cell wall. The second is metabolism dependent uptake of free metals ions into the cytoplasm, followed by complexation with intracellular thiol peptides (phytochelatins or metallothioneins) and translocation into vacuoles.…”

Section: Synergistic Effects Of Cu On the Bioconcentration Of Pb And ...mentioning

confidence: 99%

“…Microalgae are also known to differ in metal uptake mechanisms and accumulation capacities, depending on the metal types and algal species. 62 A fixed-bedflow-through column setup commonly used to determine metal ion affinity for the algal cell wall demonstrate that macroalgae (Gelidium sesquipedale) favor the biosorption of Pb as compared to Cd. 63 In another study, Cu is determined to have higher affinity than Cd or Zn for Ca-treated Sargassum fluitans biosorbents.…”

Section: Synergistic Effects Of Cu On the Bioconcentration Of Pb And ...mentioning

confidence: 99%

Metallomics and NMR-based metabolomics of Chlorella sp. reveal the synergistic role of copper and cadmium in multi-metal toxicity and oxidative stress

Zhang

Tan

et al. 2015

Metallomics

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Industrial wastewaters often contain high levels of metal mixtures, in which metal mixtures may have synergistic or antagonistic effects on aquatic organisms. A combination of metallomics and nuclear magnetic resonance spectroscopy (NMR)-based metabolomics was employed to understand the consequences of multi-metal systems (Cu, Cd, Pb) on freshwater microalgae. Morphological characterization, cell viability and chlorophyll a determination of metal-spiked Chlorella sp. suggested synergistic effects of Cu and Cd on growth inhibition and toxicity. While Pb has no apparent effect on Chlorella sp. metabolome, a substantial decrease of sucrose, amino acid content and glycerophospholipid precursors in Cu-spiked microalgae revealed Cu-induced oxidative stress. Addition of Cd to Cu-spiked cultures induced more drastic metabolic perturbations, hence we confirmed that Cu and Cd synergistically influenced photosynthesis inhibition, oxidative stress and membrane degradation. Total elemental analysis revealed a significant decrease in K, and an increase in Na, Mg, Zn and Mn concentrations in Cu-spiked cultures. This indicated that Cu is more toxic to Chlorella sp. as compared to Cd or Pb, and the combination of Cu and Cd has a strong synergistic effect on Chlorella sp. oxidative stress induction. Oxidative stress is confirmed by liquid chromatography tandem mass spectrometry analysis, which demonstrated a drastic decrease in the GSH/GSSG ratio solely in Cu-spiked cultures. Interestingly, we observed Cu-facilitated Cd and Pb bioconcentration in Chlorella sp. The absence of phytochelatins and an increment of extracellular polymeric substances (EPS) yields in Cu-spiked cultures suggested that the mode of bioconcentration of Cd and Pb is through adsorption of free metals onto the algal EPS rather than intracellular chelation to phytochelatins.

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“…Phytoremediation offer several advantages. It is cheap, promotes biodiversity, reduces erosion, less destructive and decreased energy consumption leading to reduced carbon dioxide emission [11]. To date, about 400 plant species were suggested to be metal hyper-accumulators [12].…”

Section: Introductionmentioning

confidence: 99%

Phytoremediation: Halophytes as Promising Heavy Metal Hyperaccumulators

Usman¹,

Abu-Dieyeh²

2018

Heavy Metals

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The continued accumulation of trace and heavy metals in the environment presents a significant danger to biota health, including humans, which is undoubtedly undermining global environmental sustainability initiatives. Consequently, the need for efficient remediation technologies becomes imperative. Phytoremediation is one of the most viable options in this regard. Hundreds of plants in laboratory experiments demonstrate the potential to remediate varying concentrations of heavy metals; however, the remediation capacity of most of these plants proved unsatisfactory under field conditions. The identification and selection of plants with higher metal uptake capacity or hyperaccumulators are one of the limitations of this technology. Additionally, the mechanism of heavy metal uptake by plants remains to be sufficiently documented. The halophyte plants are famous for their adaptation to harsh environmental conditions, and hence could be the most suitable candidates for heavy metal hyperaccumulation. The state of Qatar in the Gulf region encompasses rich resources of halophytes that have the potential for future investment toward human and environmental health. This chapter, therefore, gives an overview of phytoremediation, with emphasis on halophytes as suitable heavy metal hyperaccumulators for improved remediation of heavy metal-contaminated areas.

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Plant Resistance to Anthropogenic Toxicants: Approaches to Phytoremediation

Cited by 10 publications

References 96 publications

Plant Assimilation Kinetics and Metabolism of 2-Mercaptobenzothiazole Tire Rubber Vulcanizers by Arabidopsis

Plant Assimilation Kinetics and Metabolism of 2-Mercaptobenzothiazole Tire Rubber Vulcanizers by Arabidopsis

Metallomics and NMR-based metabolomics of Chlorella sp. reveal the synergistic role of copper and cadmium in multi-metal toxicity and oxidative stress

Phytoremediation: Halophytes as Promising Heavy Metal Hyperaccumulators

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