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Effects of high metal concentrations on antioxidative system in Phragmites australis grown in mine and flotation tailings ponds

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Abstract

Aims

Phragmites australis grows as a pioneer plant species in several mine and flotation tailings ponds distinguished by extremely high concentrations of metals. The main goals of this study were to estimate the effects of the specific concentrations and combinations of accumulated metals on the efficiency of antioxidative enzymes and plant oxidative status. This study is relevant to our understanding of the common reed exceptional capacity to endure extreme edaphic conditions.

Methods

Metal concentrations were determined in the sediment, roots and leaves. Antioxidative enzymes activities, amounts of pigments and phenolics, total antioxidative capacity (TAC), lipid peroxidation level (LP) were analysed in plant organs.

Results

Effects of accumulated metals depended on their concentrations and their stoichiometry. Antioxidative enzymes and TAC in roots were significantly reduced, resulting in consequent increase in LP. Pb concentration in leaves did not significantly change enzymes activities, whereas toxic level of Cu impeded activity of catalaze and ascorbate peroxidase.

Conclusions

The results indicate that in the conditions of high root metal contamination the mechanisms involved in their immobilization and detoxification cannot completely restrain their toxicity. Their effects on enzymes activities depend on the type of enzyme, metal concentrations, specific ratios and interactions.

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Abbreviations

APX:

ascorbate peroxidase

CAT:

catalase

Chl:

chlorophyll

Chl (a + b) :

total chlorophyll

Chl a/b :

Chl a / Chl b ratio

Car:

total carotenoids

GR:

glutathione reductase

LP:

lipid peroxidation level

POD:

total soluble peroxidases

SOD:

superoxide dismutase

TAC:

total antioxidative capacity

Ph:

phenolics

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Acknowledgements

This work was supported by the Serbian Ministry of Education, Science and Technological Development (Grant No.451-03-68/2020-14/ 200178). The authors thank to Dr. Jasmina Šinžar-Sekulić for assistance in statistical analysis of data, and to the editor and the reviewers for helpful comments on the manuscript.

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Correspondence to Tamara Rakić.

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The authors declare that they have no conflict of interest.

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Responsible Editor: Antony Van der Ent.

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ESM 1

Location of the study area on the map of Serbia, and strands of Phragmites australis grown in unpolluted pond Carska bara (Control) (a), mine tailings Bor1 (b) and Bor2 (c) and flotation tailings Rudnik (d). (PNG 539 kb)

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Kovačević, M., Jovanović, Ž., Andrejić, G. et al. Effects of high metal concentrations on antioxidative system in Phragmites australis grown in mine and flotation tailings ponds. Plant Soil 453, 297–312 (2020). https://doi.org/10.1007/s11104-020-04598-x

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  • DOI: https://doi.org/10.1007/s11104-020-04598-x

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