Nascimento Alex Favaro, Pires Fábio Ribeiro, Chagas Kristhiano, de Oliveira Procópio Sergio, Oliveira Marcelo Antonio, Cargnelutti Filho Alberto, Belo Alessandra Ferreira, Egreja Filho Fernando Barboza
a Tropical Agriculture Group , Federal University of Espirito Santo , Brazil.
Int J Phytoremediation. 2015;17(1-6):313-21. doi: 10.1080/15226514.2014.909775.
This study aimed to evaluate the herbicidal activity of picloram on the biomass of the remediation plants Eleusine coracana and Panicum maximum after cultivation in a soil contaminated with this herbicide. These species were grown in three soils, differentiated based on texture (clayish, middle, and sandy, with 460, 250, and 40 g kg(-1) of the clay, respectively), previously contaminated with picloram (0, 80, and 160 g ha(-1)). After 90 days, the plants were harvested and an extract was produced by maceration of leaves and stems of these plants. It was applied to pots containing washed sand, comprising a bioassay in a growth chamber using soybean as a bioindicator for picloram. Soil and plant samples were analyzed by HPLC. The results showed the presence of picloram or metabolites with herbicidal activity in the shoots of E. coracana and P. maximum at phytotoxic levels with regard to soybean plants, indicating that they work only as phytoextractors and that the presence of straw on the soil surface can promote recontamination within the area. It is not recommended to cultivate species susceptible to picloram in areas where it was reported remediation by E. indica and P. maximum and still present residues of these species.
本研究旨在评估毒莠定对在受该除草剂污染的土壤中种植后的修复植物龙爪稷和大黍生物量的除草活性。这些植物种植在三种土壤中，根据质地（黏质、中等质地和砂质，分别含有460、250和40 g kg⁻¹ 的黏土）区分，之前已被毒莠定污染（0、80和160 g ha⁻¹）。90天后，收获植物，并通过浸渍这些植物的叶和茎制备提取物。将提取物施用于装有洗净沙子的花盆中，在生长室中以大豆作为毒莠定的生物指示物进行生物测定。通过高效液相色谱法分析土壤和植物样品。结果表明，在对大豆植株具有植物毒性水平的龙爪稷和大黍的地上部分中存在毒莠定或具有除草活性的代谢物，这表明它们仅作为植物提取剂起作用，并且土壤表面秸秆的存在会促进该区域内的再污染。不建议在曾报道过用龙爪稷和大黍进行修复且仍存在这些物种残留的区域种植对毒莠定敏感的物种。
