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Visando avaliar os efeitos do fluoreto sobre capim-braquiária, plantas de Brachiaria brizantha e B. decumbens foram submetidas a nevoeiros simulados com fluoreto (10 µg ml-1). Amostras foliares de porções aparentemente sadias foram coletadas 24 horas após a última exposição para análises microscópicas. Folhas, raízes e rizomas foram submetidos à quantificação do teor de fluoreto. As folhas apresentaram necroses pequenas e esparsas. Somente as folhas acumularam fluoreto, apresentando teores 4,4 e 5,2 vezes maiores que no tratamento controle, em B. brizantha e B. decumbens, respectivamente, não havendo diferença no potencial acumulador das duas espécies. As principais alterações micromorfológicas observadas foram lesões próximas aos tricomas, sugerindo que estes sejam as vias preferenciais de entrada do poluente nas plantas. Porções foliares, visualmente sadias, de ambas as espécies apresentaram danos microscópicos antes do surgimento de sintomas, havendo perda da turgidez das células buliformes em B. brizantha e de todos os tecidos em B. decumbens. Alterações micromorfométricas foram observadas somente em B. decumbens, indicando sua maior sensibilidade ao fluoreto, em comparação com B. brizantha. A realização de experimentos de longa duração será fundamental para elucidar o potencial bioacumulador de B. brizantha. To assess the effects of fluoride on signal grass, plants of Brachiaria brizantha and B. decumbens were submitted to simulated fluoride fog (10 µg ml-1). Leaf fragments from apparently healthy portions were colleted 24 hours after the last exposure and used for microscopic analysis. Roots, leaves and rhizomes were submitted to fluoride content quantification. The leaves presented small, sparse necroses. The accumulation of fluoride was observed on the leaves only. B. brizantha and B. decumbens presented, respectively, 4.4 and 5.2 times more fluoride than the control treatment. No difference was observed concerning the accumulation potential of both species. The main micromorphological alterations observed were injuries near the trichomes, therefore, suggesting that these are the preferential routes by which pollutants enter the plants. Visually healthy leaf portions of the two species showed microscopic damages before symptoms appeared, presenting turgidity loss in the bulliform cells of B. brizantha and in all tissues of B. decumbens. Micromorphometric alterations were observed only in B. decumbens, indicating higher sensibility to fluoride in comparison to B. brizantha. Further studies of long duration will be essential to determine the bioaccumulation potential of B. brizantha

Efeitos fitotóxicos do fluoreto na morfoanatomia foliar de Brachiaria brizantha (Hochst. ex A. Rich.) Stapf e Brachiaria decumbens Stapf (Poaceae)