Effect of selenium and soil pH on cadmium phytoextraction by Urochloa decumbens grown in Oxisol

Effect of selenium and soil pH on cadmium phytoextraction by Urochloa decumbens grown in Oxisol

It has been speculated that selenium (Se) supply can affect cadmium (Cd) ‘availability’ and increase the Cd tolerance of plants used for phytoextraction, in a pH-dependent process. Thus, we evaluated the interaction Cd-Se and the effects of soil pH in this interaction on plant availability of Cd and...

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Bibliographic Details
Published in:Journal of hazardous materials Vol. 447; p. 130771
Main Authors: Borgo, Lucélia, Rabêlo, Flávio Henrique Silveira, Rossi, Mônica Lanzoni, Santos, Felipe Hipólito dos, Nogueira, Maria Luiza Ginez, Alleoni, Luís Reynaldo Ferracciú, Linhares, Francisco Scaglia, Vangronsveld, Jaco, Lavres, José
Format: Journal Article
Language:English
Published: Netherlands Elsevier B.V 05-04-2023
Subjects:
Biodegradation, Environmental
Cadmium - analysis
Hydrogen-Ion Concentration
Ionome
Poaceae
Root growth
Selenate
Selenium
Signal grass
Soil
Soil Pollutants - analysis
Toxicity
Tropical soils
Tropical soils
Selenate
Toxicity
Root growth
Signal grass
Ionome
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Summary:It has been speculated that selenium (Se) supply can affect cadmium (Cd) ‘availability’ and increase the Cd tolerance of plants used for phytoextraction, in a pH-dependent process. Thus, we evaluated the interaction Cd-Se and the effects of soil pH in this interaction on plant availability of Cd and phytoextraction efficiency of Urochloa decumbens cv. Basilisk grown in Oxisol. Two soil concentrations of Cd (0.93 and 3.6 mg kg-1) and Se (<0.2 and 1 mg kg-1) and two soil pH (0.01 mol L-1 CaCl2) conditions (4.1 and 5.7) were considered. At both pH, Se supply increased the exchangeable fraction of Cd and decreased the residual Cd fraction. At pH 4.1, the growth of U. decumbens was impaired by Se addition, regardless of Cd exposure. The lower root growth and tillering of U. decumbens exposed to Cd disappeared at pH 5.7 due to uptake of low Se concentrations. Thus, the toxic or beneficial effects of Se on growth of U. decumbens used for Cd phytoextraction depend on the amount of Se assimilated. The Cd phytoextraction efficiency of U. decumbens was not improved by Se supply, regardless of soil pH. Therefore, we cannot recommend the application of Se to increase Cd phytoextraction by this grass. [Display omitted] •Selenium supply increased the exchangeable fraction of Cd, and Cd ‘availability’ decreased at increasing pH.•At pH 4.1, application of 1 mg Se kg-1 soil led to toxicity in U. decumbens.•Selenium supply increased the tolerance to Cd of U. decumbens grown at soil pH 5.7.•Cadmium phytoextraction efficiency by U. decumbens was higher at lower pH in Oxisol.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2023.130771