Ecotoxicidade de herbicidas para a macrófita aquática (Azolla caroliniana)
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Data
2012-09-01
Autores
Silva, A.F.
Cruz, C.
N. Neto, A.
Pitelli, R.A. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira da Ciência das Plantas Daninhas
Resumo
Os objetivos deste estudo foram avaliar Azolla caroliniana como planta-teste em estudos ecotoxicológicos e estimar a CL50;7d dos herbicidas 2,4-D, glyphosate, clomazone e oxyfluorfen. As plantas foram aclimatadas em sala de bioensaio. Para isso, foram selecionadas cinco plantas em 50 mL de meio de cultivo Hoagland. Após esse período, foram adicionados 50 mL de Hoagland mais o herbicida, completando o volume para 100 mL. A concentração letal de 50% (CL50;7d) para A. caroliniana exposta ao herbicida 2,4-D foi de 708,35 mg L-1; ao glyphosate (formulação Scout®), de 23,66 mg L-1; ao glyphosate (formulação Trop®), de 38,91 mg L-1; ao clomazone, de 129,63 mg L-1; e ao oxyfluorfen, de 80,50 mg L-1. Os herbicidas glyphosate (Scout® e Trop®) e oxyflourfen foram classificados como moderadamente tóxicos a A. caroliniana, e o clomazone e o 2,4-D, como praticamente não tóxicos. Conclui-se que A. caroliniana pode ser utilizada como planta bioindicadora de herbicidas à base de glyphosate e oxyfluorfen.
The objectives of this study were to evaluate Azolla caroliniana as test plant in ecotoxicological studies and to estimate the LC50; 7d of the herbicides 2,4 D , glyphosate, and clomazone oxyfluorfen. The plants were acclimatized in the bioassay room. Five plants in 50 mL Hoagland culture medium were selected. After that, 50 mL of Hoagland and the herbicide were added, completing the volume to 100 mL. The 50% lethal concentration (LC50; 7d) for A. caroliniana exposed to the herbicide 2,4- D, was 708.35 mg L-1; to glyphosate (formulation Scout®), 23.66 mg L-1; to glyphosate (formulation Trop®), 38.91 mg L-1; to clomazone, 129.63 mg L-1; and to oxyflourfen, 80.50 mg L-1. The herbicides glyphosate (Scout® and Trop®) and oxyflourfen were classified as moderately toxic to A. caroliniana, while clomazone and 2,4-D were classified as practically non-toxic. It was concluded that A. caroliniana plants can be used as bio-indicators for glyphosate and oxyfluorfen-based herbicides.
The objectives of this study were to evaluate Azolla caroliniana as test plant in ecotoxicological studies and to estimate the LC50; 7d of the herbicides 2,4 D , glyphosate, and clomazone oxyfluorfen. The plants were acclimatized in the bioassay room. Five plants in 50 mL Hoagland culture medium were selected. After that, 50 mL of Hoagland and the herbicide were added, completing the volume to 100 mL. The 50% lethal concentration (LC50; 7d) for A. caroliniana exposed to the herbicide 2,4- D, was 708.35 mg L-1; to glyphosate (formulation Scout®), 23.66 mg L-1; to glyphosate (formulation Trop®), 38.91 mg L-1; to clomazone, 129.63 mg L-1; and to oxyflourfen, 80.50 mg L-1. The herbicides glyphosate (Scout® and Trop®) and oxyflourfen were classified as moderately toxic to A. caroliniana, while clomazone and 2,4-D were classified as practically non-toxic. It was concluded that A. caroliniana plants can be used as bio-indicators for glyphosate and oxyfluorfen-based herbicides.
Descrição
Palavras-chave
bioindicator, acute toxicity, Pesticide, Macrophytes, bioindicador, Toxicidade aguda, produtos fitossanitários, Macrófita
Como citar
Planta Daninha. Sociedade Brasileira da Ciência das Plantas Daninhas , v. 30, n. 3, p. 541-546, 2012.