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Heavy Metals Behavior in the Presence of Organic Acids and Proteins in the Rhizosphere and Plant Tissues of Yellow Melon var. Natal (Cucumis melo L.) Cultivated in a Quartzarenic Neosol

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Abstract

We propose to identify the influence of organic acids as well as total proteins in the accumulation and translocation of heavy metals from the rhizosphere to the plant organs of cultivated yellow melon var. Natal throughout the vegetative cycle. Physical and chemical attributes and the concentration of Cu, Zn, and Pb were determined in soil samples. Samples of plant tissue and rhizosphere at 0, 15, 30, 45, and 60 days after transplantation were collected and determined the concentration of heavy metals along with the content of total protein in the tissues and organic acids in the rhizosphere. Subsequently, the transfer factor (TF) and bioconcentration factor (BF) were calculated. Oxalic and citric acids and heavy metal contents were slightly higher in the rhizosphere than those found in the soil. The organic acids and total protein showed correlations with the concentration of heavy metals in different organs of the plant. The protein content in the plant tissues and the contents of oxalic and citric acid released by the plant in the rhizosphere can increase or decrease the absorption, accumulation, and translocation of Cu, Zn, and Pb in the different organs of the yellow melon var. Natal. Even the BF and TF showed values higher than one, being indicative of phytoextraction potential in several stages of the vegetative cycle for Cu and Zn, the yellow melon var. Natal cannot be considered as a hyperaccumulator plant for not meeting all necessary criteria for that purpose.

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Acknowledgments

We are grateful to OEA (Organization of American States) and to CAPES (Brazilian Federal Agency for Support and Evaluation of Graduate Education) for the scholarship granting to the authors, to the “Pró-Integração” project 55/2013 for partially funding this research, to the Graduate Program in Soil Science of the Federal University of Ceará, to Soil Quality and Environmental Chemistry Research Group—QSQA, and to the Fazenda Agrícola Famosa.

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Correspondence to Maria Eugenia Ortiz Escobar.

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Irias Zelaya, C., Gadelha, J.C., Hernandez, F.F.F. et al. Heavy Metals Behavior in the Presence of Organic Acids and Proteins in the Rhizosphere and Plant Tissues of Yellow Melon var. Natal (Cucumis melo L.) Cultivated in a Quartzarenic Neosol. Water Air Soil Pollut 231, 572 (2020). https://doi.org/10.1007/s11270-020-04931-1

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  • DOI: https://doi.org/10.1007/s11270-020-04931-1

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