AÇÃO DO SISTEMA ENZIMÁTICO ANTIOXIDANTE DOS LÍQUENS Parmotrema tinctorum E Usnea barbata NA PRESENÇÃO DO HERBICIDA GLIFOSATO

Abstract

Lichens are organisms that are very sensitive to xenobiotics and can be used as bioindicators of environmental pollution, however, there are few studies that use lichens in the biomonitoring of agricultural pollution caused by herbicides. The objective of this work was to evaluate the effect of different doses of the herbicide glyphosate at different exposure periods on the lichens Parmotrema tinctorium and Usnea barbata in order to assess whether oxidative stress is a promising biomarker to be used in the biomonitoring of herbicides by lichenic species. The concentration of H2O2 and the activity of SOD, APX and CAT enzymes were evaluated. It was observed in both species an increase in H202 concentrations and an increase in the activity of SOD and APX enzymes, which demonstrate that both species suffered oxidative stress and changes in antioxidant metabolism. Thus, it is concluded that oxidative stress is a promising biomarker to be used in studies that evaluate the effects of herbicides on lichen species.