Abstract
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.
Highlights
Pesticides are substances or mixtures of substances used to kill pests (USEPA, 2007)
It is a pesticide that is widely utilized in agriculture, and it is applied to eliminate aquatic insect larvae that prey on fish larvae (Sosak-Swiderska, 1998; Fanta et al, 2003)
The ranges of concentrations used in the experiments with Lemna were 0, 2, 4, 6, 7 and 8g.L–1 for NaCl and 0, 8, 16, 22, 28 and 32mg.L–1 for methyl parathion
Summary
Pesticides are substances or mixtures of substances used to kill pests (USEPA, 2007). Sodium chloride (NaCl) has already been used as a reference substance in tests of toxicity with aquatic animals and plants. He present study was carried out to determine the effect of different toxic levels of methyl parathion and sodium chloride on the growth and photosynthetic pigments in L. minor.
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