摘要
Soil contaminated with pesticides may reduce plant development due to their toxicity. The aim of this study was to evaluate the influence on the germination of </span><i><span style="font-family:Verdana;">Zea mayz</span></i><span style="font-family:Verdana;"> and </span><i><span style="font-family:Verdana;">Phaseolus vulgaris </span></i><span style="font-family:Verdana;">of the two main intermediates of the 2,4-D degradation, which are 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP). Maize and bean seeds were treated with distilled water (control treatment) and increased concentrations of 4-CP and 2,4-DCP (0.006, 0.1, 1.0, 1.5 g·L</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">). It was assessed seed germination and calculated various parameters. The parameter most affected by chlorophenols was the index of germination rate, being the </span><i><span style="font-family:Verdana;">P. vulgaris</span></i><span style="font-family:Verdana;"> seeds most affected. 2,4-DCP was the compound most toxic for both plants. The germination index was dependent </span><span style="font-family:Verdana;">doses for both plant models tested. The results indicate that 4-CP and</span><span style="font-family:Verdana;"> 2,4-DCP affected the index of germination rate but not influenced in other parameters of germination of </span><i><span style="font-family:Verdana;">Zea mayz</span></i><span style="font-family:Verdana;"> and </span><i><span style="font-family:Verdana;">Phaseolus vulgaris.</span></i><span style="font-family:Verdana;"> Maize was </span><span style="font-family:Verdana;">most tolerance to both chlorophenols in the assessed concentrations. 2,4-DCP </span><span style="font-family:Verdana;">was the most toxic of chlorophenols tested.
Soil contaminated with pesticides may reduce plant development due to their toxicity. The aim of this study was to evaluate the influence on the germination of </span><i><span style="font-family:Verdana;">Zea mayz</span></i><span style="font-family:Verdana;"> and </span><i><span style="font-family:Verdana;">Phaseolus vulgaris </span></i><span style="font-family:Verdana;">of the two main intermediates of the 2,4-D degradation, which are 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP). Maize and bean seeds were treated with distilled water (control treatment) and increased concentrations of 4-CP and 2,4-DCP (0.006, 0.1, 1.0, 1.5 g·L</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">). It was assessed seed germination and calculated various parameters. The parameter most affected by chlorophenols was the index of germination rate, being the </span><i><span style="font-family:Verdana;">P. vulgaris</span></i><span style="font-family:Verdana;"> seeds most affected. 2,4-DCP was the compound most toxic for both plants. The germination index was dependent </span><span style="font-family:Verdana;">doses for both plant models tested. The results indicate that 4-CP and</span><span style="font-family:Verdana;"> 2,4-DCP affected the index of germination rate but not influenced in other parameters of germination of </span><i><span style="font-family:Verdana;">Zea mayz</span></i><span style="font-family:Verdana;"> and </span><i><span style="font-family:Verdana;">Phaseolus vulgaris.</span></i><span style="font-family:Verdana;"> Maize was </span><span style="font-family:Verdana;">most tolerance to both chlorophenols in the assessed concentrations. 2,4-DCP </span><span style="font-family:Verdana;">was the most toxic of chlorophenols tested.
