The Proper Supply of S Increases Amino Acid Synthesis and Antioxidant Enzyme Activity in Tanzania Guinea Grass Used for Cd Phytoextraction

Rabêlo, Flávio Henrique Silveira; Azevedo, Ricardo Antunes; Monteiro, Francisco Antônio

doi:10.1007/s11270-017-3563-6

Cited by 21 publications

(8 citation statements)

References 60 publications

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“…However, it has been reported that supplying S enhances Cd tolerance in Panicum maximum cv. Tanzania by increasing amino acid synthesis and antioxidant enzyme activities 35 . This contradictory result suggests that a different mechanism is applicable in different plant species.…”

Section: Discussionmentioning

confidence: 99%

Effects of exogenous sulfur on alleviating cadmium stress in tartary buckwheat

Wang

et al. 2019

Sci Rep

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Supplying exogenous sulfur-rich compounds increases the content of glutathione(GSH) and phytochelatins(PCs) in plant tissues, enabling plants to enhance their cellular defense capacity and/or compartmentalize Cadmium(Cd) into vacuoles. However, the mechanism by which surplus S modulates tolerance to Cd stress in different tissues need further investigation. In the present study, we found that supplementing the tartary buckwheat( Fagopyrum tararicum ) exposed to Cd with surplus S reversed Cd induced adverse effects, and increased Cd concentrations in roots, but decreased in leaves. Further analysis revealed that exogenous S significantly mitigated Cd-induced oxidative stress with the aids of antioxidant enzymes and agents both in leaves and roots, including peroxidase(POD), ascorbate peroxidase(APX), glutathione peroxidase(GPX), glutathione S-transferase(GST), ascorbic acid(AsA), and GSH, but not superoxide dismutase(SOD) and catalase(CAT). The increased Cd uptake in root vacuoles and decreased translocation in leaves of exogenous S treated plants could be ascribed to the increasing Cd binding on cell walls, chelation and vacuolar sequestration with helps of non-protein thiols(NPT), PCs and heavy metal ATPase 3(FtHMA3) in roots, and inhibiting expression of FtHMA2 , a transporter that helps Cd translocation from roots to shoots. Results provide the fundamental information for the application of exogenous S in reversal of heavy metal stress.

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Section: Discussionmentioning

confidence: 99%

Effects of exogenous sulfur on alleviating cadmium stress in tartary buckwheat

Wang

et al. 2019

Sci Rep

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“…However, the chelation of trace elements (e.g., Ni) by free histidine accumulated in the roots inhibits the trace element sequestration into the vacuole and promotes trace element translocation from the roots to shoots ( Richau et al, 2009 ). Besides proline and histidine, other amino acids such as cysteine can be more accumulated under trace element exposure in grasses ( Rabêlo et al, 2017b ), probably due to their use for peptides synthesis.…”

Section: Tolerance Mechanisms Of Grasses To Trace Element Toxicitymentioning

confidence: 99%

“…Similarly, S can also alleviate trace element toxicity by promoting the synthesis of S-containing metabolites like GSH and PCs, enhancing the activity of the AsA-GSH cycle, and regulating ethylene signaling, among other factors ( Sarwar et al, 2010 ; Singh et al, 2016 ). An appropriate S supply allowed higher Cd translocation from the roots to the stems in P. maximum ( Rabêlo et al, 2018c ), as well as higher GSH and PCs synthesis, and improved the activities of enzymes of the AsA-GSH cycle, which is essential to lower Cd phytotoxicity and tiller mortality rate in grasses, which contributed to a higher Cd phytoextraction efficiency ( Rabêlo et al, 2017a , b , 2018b ). Panicum maximum appropriately provided with S was more tolerant to Cu-exposure ( Gilabel et al, 2014 ).…”

Section: Strategies To Improve the Efficiency Of Trace Element Phytoremediation By Grassesmentioning

confidence: 99%

Are Grasses Really Useful for the Phytoremediation of Potentially Toxic Trace Elements? A Review

et al. 2021

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The pollution of soil, water, and air by potentially toxic trace elements poses risks to environmental and human health. For this reason, many chemical, physical, and biological processes of remediation have been developed to reduce the (available) trace element concentrations in the environment. Among those technologies, phytoremediation is an environmentally friendly in situ and cost-effective approach to remediate sites with low-to-moderate pollution with trace elements. However, not all species have the potential to be used for phytoremediation of trace element-polluted sites due to their morpho-physiological characteristics and low tolerance to toxicity induced by the trace elements. Grasses are prospective candidates due to their high biomass yields, fast growth, adaptations to infertile soils, and successive shoot regrowth after harvest. A large number of studies evaluating the processes related to the uptake, transport, accumulation, and toxicity of trace elements in grasses assessed for phytoremediation have been conducted. The aim of this review is (i) to synthesize the available information on the mechanisms involved in uptake, transport, accumulation, toxicity, and tolerance to trace elements in grasses; (ii) to identify suitable grasses for trace element phytoextraction, phytostabilization, and phytofiltration; (iii) to describe the main strategies used to improve trace element phytoremediation efficiency by grasses; and (iv) to point out the advantages, disadvantages, and perspectives for the use of grasses for phytoremediation of trace element-polluted soils.

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“…The content of Gly and Ser upon Cd treatment has been reported to depend on plant species, the tissue examined, and Cd exposure time as well as concentration applied (Xie et al, 2014; Ma et al, 2017; Rabêlo et al, 2017). In the present study, Cd treatment did not significantly change foliar Gly and Ser contents of both plant types compared to control plants, except for Ser at night (Figure 7).…”

Section: Discussionmentioning

confidence: 99%

Knock-Down of the Phosphoserine Phosphatase Gene Effects Rather N- Than S-Metabolism in Arabidopsis thaliana

et al. 2018

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The aim of present study was to elucidate the significance of the phosphorylated pathway of Ser production for Cys biosynthesis in leaves at day and night and upon cadmium (Cd) exposure. For this purpose, Arabidopsis wildtype plants as control and its psp mutant knocked-down in phosphoserine phosphatase (PSP) were used to test if (i) photorespiratory Ser is the dominant precursor of Cys synthesis in autotrophic tissue in the light, (ii) the phosphorylated pathway of Ser production can take over Ser biosynthesis in leaves at night, and (iii) Cd exposure stimulates Cys and glutathione (GSH) biosynthesis and effects the crosstalk of S and N metabolism, irrespective of the Ser source. Glycine (Gly) and Ser contents were not affected by reduction of the psp transcript level confirming that the photorespiratory pathway is the main route of Ser synthesis. The reduction of the PSP transcript level in the mutant did not affect day/night regulation of sulfur fluxes while day/night fluctuation of sulfur metabolite amounts were no longer observed, presumably due to slower turnover of sulfur metabolites in the mutant. Enhanced contents of non-protein thiols in both genotypes and of GSH only in the psp mutant were observed upon Cd treatment. Mutation of the phosphorylated pathway of Ser biosynthesis caused an accumulation of alanine, aspartate, lysine and a decrease of branched-chain amino acids. Knock-down of the PSP gene induced additional defense mechanisms against Cd toxicity that differ from those of WT plants.

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The Proper Supply of S Increases Amino Acid Synthesis and Antioxidant Enzyme Activity in Tanzania Guinea Grass Used for Cd Phytoextraction

Cited by 21 publications

References 60 publications

Effects of exogenous sulfur on alleviating cadmium stress in tartary buckwheat

Effects of exogenous sulfur on alleviating cadmium stress in tartary buckwheat

Are Grasses Really Useful for the Phytoremediation of Potentially Toxic Trace Elements? A Review

Knock-Down of the Phosphoserine Phosphatase Gene Effects Rather N- Than S-Metabolism in Arabidopsis thaliana

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