Malaysian Applied Biology Journal

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36-1-02

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Malays. Appl. Biol.(2007) 36(1): 7–13

THE IMPACT OF TWO PESTICIDES DIFLUBENZURON AND FLUCYCLOXURON, ON A MICROALGAE Tetraselmis suecica.

ROUABHI R1*, DJEBAR-BERREBBAH H.2 and DJEBAR M.R.2

1 Department of Biology, University center Larbi Tebessi, Tebessa, 12000, Algeria.
2 Laboratory of Cell toxicology, Department of Biology, Faculty of the Sciences, Annaba university, 23000, Annaba, Algeria.
*E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

ABSTRACT

The effect of two pesticides, the Diflubenzuron (DFB) and the Flucycloxuron (FCX) has been studied on a cellular model: Tetraselmis suecica, a flagellated protiste. The two pesticides have been tested in vivo on the culture of Protiste in strictly controlled conditions (Temperature, Light/Obscurity). The treatment with the DFB in the concentrations of 10 and 20 ?g/ml reduces the growth of this Protiste appreciably. The survey of the respiratory metabolism by the polarography technique (Oxygen electrode) shows a sensitive perturbation of the oxygen consumption by the studied protiste. In the case of the FCX, the treatment with the two concentrations (10 and 20 ?g/ml) reveals an inhibition of the protiste growth; however, this pesticide inhibits the respiratory metabolism of ciliated protiste. This effect is a lot more marked with the FCX that with the DFB.

Key words: Tetraselmis suecica, Flagellated protiste, Flucycloxuron, Diflubenzuron, Pesticides

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