A prolonged exposure to A. ovalisporum cell extracts (9 days in total) may lead to a significant plant physiological stress as assessed by the increase in leaf fresh weight. The increase in root GPx and GST activities after 6 or 9 days of plant exposure to A. ovalisporum corroborates this hypothesis, indicating a response in order to counteract ROS production. The changes in GPx activities also show that the tissues directly exposed to the cell extract were the most sensitive, whereas the enhanced GST activities were more marked in the leaves, since the 3-day of exposure to CYN