Effects of Exogenous Antioxidant Melatonin on Physiological and Biochemical Characteristics of Populus cathayana × canadansis ‘Xin Lin 1’ under Salt and Alkaline Stress

Salt and alkaline stress is one of the important problems restricting agricultural production afforestation projects. This kind will greatly limit growth development forest trees. Recently, melatonin has been gradually realized as a strong antioxidant due to its regulatory protective roles in process plant development. study takes Xin Lin 1 (Populus cathayana × canadansis ‘Xin 1’) research object, measures changes physiological indexes at different time points verify alleviation effect under salt stress. In this experiment, plants have behaviors face levels exogenous melatonin. Among them, low concentrations (50 μM 100 μM) were more helpful reduce MDA osmotic regulators leaves. At level, SOD CAT content leaves increased significantly. Melatonin 800 was inclined induce POD, but activity not significantly induced. Overall, contributes secretion ABA tendency inhibit SA. It worth mentioning that treatment conducive IAA. To sum up, experiment proves dose alleviating