Toxicity of sodium chloride and methyl parathion on the macrophyte Lemna minor (Linnaeus, 1753) with respect to frond number and chlorophyll

Erlei Cassiano Keppeler

Resumo


Duckweed, Lemna minor L., is a suitable plant model for toxicity evaluation of many contaminants due to its small size and rapid growth. Methyl parathion is a toxic compound which is utilized to eliminate aquatic insect larvae, among other purposes. Its toxicity was evaluated with the use of L. minor in this study. Methyl parathion was added to Hoagland’s nutrient medium at concentrations of 0, 8, 16, 22, 28 and 32mg.L–1. Lemna minor is used as a tool in evaluating chemical test products for toxic effects. The sensitivity of Lemna to sodium chloride, the reference substance, at concentrations of 0, 2, 4, 6, 7 and 8 g.L–1, was determined for comparison and resulted in an IC50 of 6.87g.L–1. Methyl parathion in L. minor showed an IC50 of 49.48mg.L–1.


Palavras-chave


IC50, Lemna minor, methyl parathion, sodium chloride

Texto completo:

PDF/A


DOI: https://doi.org/10.5007/2175-7925.2009v22n3p27

Direitos autorais 2011 Erlei Cassiano Keppeler

Licença Creative Commons
Esta obra está licenciada sob uma licença Creative Commons Atribuição 4.0 Internacional.

Biotemas. UFSC, Florianópolis, SC, Brasil, eISSN 2175-7925

Licença Creative Commons
Este periódico está licenciado conforme Creative Commons Atribuição 4.0 Internacional.