Interaction between a Synthetic Dye Bath and Selenium in Their Toxicity to Dunaliella tertiolecta under Two Light Intensities

The rhizosphere, enriched in organic matter, is the bottleneck of metal transfer in the soil-plant system. However, the transformation of metal fractions in the rhizosphere and the mechanisms that are involved, notably the role of organic matter, are poorly known. In this study, the solid-phase fractionation of lead (Pb) in the rhizosphere and non-rhizosphere soil of Elsholtzia splendens in a Pb-contaminated soil was investigated using a nine-step selective sequential extraction method in a pot experiment. Compared to the non-rhizosphere soil, there were measurable increases in Pb-fulvic complexes, Pb-humic complexes, organic Pb, and amorphous Pb but no significant changes in other forms of Pb in the rhizosphere soil. Pb-fulvic complexes and organic Pb, increasing from 397 to 438 mg kg −1 and 229 to 258 mg kg −1 , respectively, showed a stronger accumulating trend than Pb-humic complexes and amorphous Pb, with an increase from 15.9 to 17.3 mg kg −1 and 6.04 to 7.80 mg kg −1 respectively, in the rhizosphere soil relative to non rhizosphere soil. These results may be mainly due to the enrichment of organic matter in the rhizosphere soil, resulting from root exudation and the enhanced turnover of microorganisms. The accumulation of Pb-fulvic complexes in the rhizosphere soil increases the potential phytoavailable pool, thus likely facilitating the phytoextraction of Pb in metalcontaminated soil.

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Interaction between a Synthetic Dye Bath and Selenium in Their Toxicity to Dunaliella tertiolecta under Two Light Intensities

Cited by 3 publications

References 19 publications

Tolerance, Accumulation, and Detoxification Mechanism of Copper in Elsholtzia splendens

Tolerance, Accumulation, and Detoxification Mechanism of Copper in Elsholtzia splendens

Effect of Elsholtzia Splendens, Soil Amendments, and Soil Managements on Cu, Pb, Zn and Cd Fractionation and Solubilization in Soil under Field Conditions

Transformation of Lead Solid Fraction in the Rhizosphere of Elsholtzia splendens: The Importance of Organic Matter

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