Oxidative stress induced by fluorine in Xanthoria parietina (L.) Th. Fr.

In our work we were interested in the toxicity of fluorine on various parameters stress: chlorophyll, proteins, and antioxidant system lichen Xanthoria parietina (L.) Th. Fr., for this purpose, thalli treated by sodium fluoride (NaF) at concentrations 0, 0.5, 1.0, 5.0 10.0 mM, time scale 24, 48 96 h. The analysis results obtained revealed that all evaluated showed significant variations compared to those controls. From obtained, it was noted chlorophyll a (Ca), b (Cb) total (Ca+b) decreased correlating with exposure times NaF (r = -0.785, p < 0.001; r -0.955, -0.899, 0.001, respectively), increase Ca/b ratio (p 0.00572**) showing Cb more affected than Ca. However, hydrogen peroxide (H2O2) increased 0.949, 0.001). correlation concentrations, Glutathione (GSH) 0.969, 0.001), while proteins -0.872, Furthermore, catalase activity (CAT) increasing X. NaF. Long-term (48 h -96 h) caused decrease GSH content 0.02*) followed destruction