Resumen

SIONE, Silvana M. J et al. Phytotoxicity of one commercial formulated glyphosate on Lemna gibba L. Ecol. austral [online]. 2018, vol.28, n.1, pp.01-11. ISSN 1667-782X.

The aim was to evaluate the phytotoxicity of one commercial formulated glyphosate (potassium salt, 62%, 506 g e.a./L) on Lemna gibba in field trials and in controlled laboratory conditions. The field study was conducted in a lentic water body associated with an agro-environment (Entre Ríos, Argentina). We conducted a temporary analysis with observations at four moments according to the proximity of the date of herbicide application in the agricultural lot and the first rainfall event that caused runoff. The phytotoxicity was evaluated on the dry biomass of frond (BF) and total chlorophyll content (TCC). In the laboratory, eight treatments were tested according to different concentrations of glyphosate (0 to 15 mg/L). The phytotoxic effects were assessed on the growth rate (GR), TCC and root length. In field study, the significant inhibition of BF and TCC observed in the subsequent sampling to the rainfall event that caused runoff could not be associated with concentrations of glyphosate in the body of water. These effects may be a􀄴ributed to runoff of others agrochemicals not analyzed. In the laboratory, a significant reduction of root length was detected, while no significant differences were observed in GR and TCC between treatments. The information generated contributes to the diagnosis of risk herbicide contamination in agroecosystems. The results obtained are not conclusive and show the need to deepen this type of studies, given the complexity of the agrochemicals research and their effects on the environment.

Palabras clave : Herbicide; Phytotoxic effects; Biomarkers; Duckweed; Agroecosystems.

        · resumen en Español     · texto en Español     · Español ( pdf )