SOD1 and infection: The activity of antioxidant enzymes in response to infection with each AMV isolate on N. glutinosa plants differed, with a significant decrease in CAT (0.352 – 0.384 nKatl mg−1) and SOD (0.537–0.563 nKatl mg-1) activities in infected plants compared to healthy plants (0.553 and 0.719 nKatl mg−1 for CAT and SOD, respectively).