Glyphosate translocation in herbicide tolerant plants.

• Autor(a) principal: GALON, L.
• Data de Publicação: 2013
• Outros Autores: FERREIRA, E. A., ASPIAZÚ, I., CONCENCO, G., SILVA, A. F., SILVA, A. A., VARGAS, L.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/949253
• topic: Spermacoce latifolia; Bidens pilosa; Corda de viola; Erva daninha; Picão preto; Weeds; Ipomoea nil; Tridax procumbens

The objective of this study was to evaluate glyphosate translocation in glyphosate-tolerant weed species (I.nil, T.procumbens and S.latifolia) compared to glyphosate-susceptible species (B. pilosa). The evaluations of 14 C-glyphosate absorption and translocation were performed at 6, 12, 36 and 72 hours after treatment (HAT) in I. nil and B. pilosa, and only at 72 HAT in the species T. procumbens and S. latifolia. The plants were collected and fractionated into application leaf, other leaves, stems, and roots. In S. latifolia, approximately 88% of the glyphosate remained in the application leaf and a small amount was translocated to roots at 72 HAT. However, 75% of the herbicide applied on T. procumbens remained in the leaf that had received the treatment, with greater glyphosate translocation to the floral bud. It was concluded that the smaller amount of glyphosate observed in S. latifolia and T. procumbens may partly account for their higher tolerance to glyphosate. However, I.nil tolerance to glyphosate may be associated with other factors such as metabolization, root exudation or compartmentalization, because a large amount of the herbicide reached the roots of this species.