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Este trabalho teve como objetivo identificar plantas tolerantes ao trifloxysulfuron sodium, visando utilizá-las em programas de fitorremediação. Foram avaliadas dez espécies: Medicago sativa, Avena strigosa, Crotalaria juncea, Canavalia ensiformis, Helianthus annus, Dolichus lablab, Stylosantes guianensis, Mucuna deeringiana, Raphanus sativus e Eleusine indica. O delineamento experimental empregado foi o de blocos ao acaso, com parcelas subdivididas, sendo utilizadas três repetições. O fator aplicado na parcela principal foram as doses de trifloxysulfuron sodium (0,00; 3,75; 7,50; e 15,00 g ha-1) e, na subparcela, as épocas de avaliação [15, 30, 45 e 60 dias após a semeadura (DAS)]. Foram avaliados a altura de plantas, os sintomas de toxicidade e, aos 60 DAS, também a biomassa seca da parte aérea, das raízes e total das plantas. Verificou-se que todas as espécies sobreviveram à presença do trifloxysulfuron sodium no solo, mesmo quando aplicado em dose duas vezes maior que a recomendada (15,00 g ha-1), porém M. deeringiana, D. lablab, C. juncea e S. guianenesis foram as espécies que apresentaram maior tolerância ao herbicida, indicando potencial para uso em programas de fitorremediação de trifloxysulfuron sodium em solos. This study aimed to identify trifloxysulfuron sodium-selective plants to be used in phytoremediation programs for this herbicide in soil. Ten plants were evaluated: Medicago sativa, Avena strigosa, Crotalaria juncea, Canavalia ensiformis, Helianthus annus, Dolichus lablab, Stylosantes guianensis, Mucuna deeringiana, Raphanus sativus and Eleusine indica. A randomized block design with split-plots and three replications was used, with the plots being the doses of trifloxysulfuron sodium (0.00; 3.75; 7.50; and 15.00 g ha-1) and the splitplots the evaluation times [15, 30, 45, and 60 days after sowing (DAS)]. Plant height and phytotoxicity visual symptoms were evaluated, and, at 60 DAS, dry biomass yield was recorded. It was verified that all species survived the presence of trifloxysulfuron sodium in soil, even when the herbicide was applied at 2x the recommended dose (15.00 g ha-1); however, the species M. deeringiana, D. lablab, C. juncea and S. guianenesis were the most tolerant to the herbicide, indicating potential for use in trifloxysulfuron sodium phytoremediation programs in soils

Seleção de plantas com potencial para fitorremediação de solos contaminados com o herbicida trifloxysulfuron sodium