Impact of methyl jasmonate on reducing of oxidative stress in Garden cress (Lepidium sativum L.) under copper stress

Methyl jasmonate is a phytohormone widely distributed and plays an important role in some physiology activities in plant. Copper is an essential element for plants. On the other hand, excess copper is present in certain regions and environments, and can be potentially toxic to plants causing phytotoxicity by the formation of reactive oxygen species that damage cells. In this study, we examined impact of various concentrations of methyl jasmonate (0, 5, 10, and 20 µM) on reducing of oxidative stress in Garden cress (Lepidium sativum L.) under different levels of Cu (50, 100, and 200 µM CuSO4) copper stress.The results showed that copper stress treatment alone increased MDA, H2O2 and antioxidative enzyme activity like catalase (CAT), guaiacol peroxidase (GPX), ascorbate peroxidase (APX) and plant survival under copper stress. It is indicating that methyl jasmonate treatment caused decrease in oxidative damge and increase copper tolerance of plants significantly.