BIOCHEMICAL AND ANTIOXIDANT RESPONSES OF MATURE RADISH PLANTS (RAPHANUS SATIVUS L.) IRRIGATED WITH TREATED WASTEWATER OF SEDRATA REGION (SOUK-AHRAS CITY, NORTHEAST ALGERIA)GUEFASSA YOUCEF, BELAHCENE NABIHA AND ZENATI NOUREDDINEAbstract This study was devoted to evaluate the effect of abiotic stress due to the contaminants of treated wastewaters of Sedrata region (northeast Algeria) on the mature radish plant cultivated and irrigated under controlled conditions. The used irrigation waters were in line with standards, excluding copper (Cu) showing a slight elevation compared to the recommended limits provided by FAO (0.2 mg/L). Whilst, the treated wastewaters poured into the Oued Charef river feeding Oued Charef dam are all classified from high to very high salinity risk. Also, GPX activity and GSH content were significantly increased in plant treated wastewaters, since the waters of Oued Charef river and dam waters have significantly affected the synthesis of proteins, and carotenoids, production of H2O2 and activation of APX and GST in radish hypocotyls. Conclusively, the used waters induced adverse physiological and biochemical effects on this plant, indicating thus the existence of intolerable elements (salts, mineralsâ¦etc.) in the plant culture. |