Atividade de glutationa S-transferase na metabolização de acetochlor, atrazine e oxyfluorfen em milho (Zea mays L.), sorgo (Sorghum bicolor L.) e trigo (Triticum aestivum L.) (Poaceae)

Abstract

This experiment was conducted to evaluate the acetochlor, atrazine and oxyfluorfen herbicides plant selectivity, in relation to glutathione S-transferase activity (GST) in maize ( Zea mays L.), sorghum ( Sorghum bicolor L.) and wheat ( Triticum aestivum L) (Poaceae) plants. GST activity was detected 24, 48 and 72 hours after treatment applications. The experiment's treatments consisted of spraying plants with water (control), acetochlor (3 L.ha -1 )`, atrazine (4 L.ha -1 ) and oxyfluorfen (1 L.ha -1 ). The highest GST activities were observed in presence of acetochlor, mainly at 48 hours after treatment. These increments were 105, 148 and 118% when compared to maize, sorghum and wheat control groups, respectively. It is suggested that the GST may have a role in acetochlor degradation and it may be a reason for this herbicide's selectivity in these crops.