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Using 14C-glyphosate to investigate the distribution of two formulations in transgenic glyphosate-resistant soybean.
Almeida, Guilherme Pires D'avila de; Mendes, Kassio Ferreira; Regitano, Jussara Borges; Piccolomini Dias, Nivea Maria; Dias Guimarães, Ana Carolina; Tornisielo, Valdemar Luiz.
Afiliación
  • Almeida GPD; Department of Education, Teaching Institute of Rio Claro, Rio Claro, SP, Brazil.
  • Mendes KF; Department of Agronomy, Federal University of Viçosa, Viçosa, MG, Brazil.
  • Regitano JB; Department of Soil Science, "Luiz de Queiroz" College of Agriculture, University of São Paulo, Piracicaba, SP, Brazil.
  • Piccolomini Dias NM; Department of Agronomy, University of State Ponta Grossa, Ponta Grossa, PR, Brazil.
  • Dias Guimarães AC; Department of Agronomy, University of State Mato Grosso, Alta Floresta, MT, Brazil.
  • Tornisielo VL; Ecotoxicology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil.
J Environ Sci Health B ; 56(9): 809-813, 2021.
Article en En | MEDLINE | ID: mdl-34311649
Glyphosate residues in grain can be explained by the concentrations and formulations of glyphosate products. This study aimed to evaluate the residues from glyphosate formulations labeled with 14C-glyphosate applied to leaves of glyphosate-resistant soybean (GRS) in two life cycles by liquid scintillation spectrometry. Different plant tissues were analyzed after the end of the plants' life cycles. The experimental design was four repetitions of three treatments: Roundup® Original, Roundup Ready®, and unformulated glyphosate (control). The application of the dosing solution was 120 µL on the first four trifoliate leaves (10 µL per leaflet) of each plant, deposited manually with a 1-µL dispenser. All treatment solutions were calculated at a 1.2 kg a.e ha-1 of glyphosate. Glyphosate formulations of Roundup® Original and Roundup Ready® increased 14C-glyphosate distribution in GRS compared to the unformulated herbicide, regardless of the experiment (first or second cycle). Overall, the percentages of total radioactivity applied (18.33 kBq) found in grains were less than 5%. Grains, stems, and leaves showed the highest levels of herbicide residues compared to other parts of the plant. Despite the Roundup Ready® formulation having increased residues, the highest value found in grains, 1.95 mg kg-1, was less than 10 mg kg-1, the maximum residue limit (MRL) in Brazil.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Glycine max / Herbicidas País/Región como asunto: America do sul / Brasil Idioma: En Revista: J Environ Sci Health B Año: 2021 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Glycine max / Herbicidas País/Región como asunto: America do sul / Brasil Idioma: En Revista: J Environ Sci Health B Año: 2021 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido