Resumen de Organ-dependent GST activation in Ocimum basilicum by endosulfan exposure

Maricela Ramírez Sandoval, Jesús Bernardino Velázquez Fernández

• Ocimum basilicum L., Basil, has shown to be a bioremediator candidate for the organochlorine pesticide endosulfan.Nevertheless, the mechanism ofphytoremediation ofthe pesticide is still unknown. Glutathione-S-Transferase (GST) is anenzyme involved in plant defense against pollutants and oxidative damage. Because of this, GST activity changes wouldbe expected after an exposition to endosulfan. Thus, to evaluate the response of basil to endosulfan exposure, wemeasured GST activity in leaves, roots, stems and rhizosphere. Plants were exposed to O, 10, 100, 1000 mg endosulfan/Kgof soil. Toe GST activity increased after endosulfan exposure depends on organ and endosulfan concentration. In leaves,GST activity increased at 10 mg/Kg, but decreased at 1000 mg/Kg. Root GST activity was increased at 10 mg/Kg, butbecame normal at higher concentrations of endosulfan. GST activity from stem and rhizosphere showed no significantvariation with the endosulfan concentration.