Effects of applying exogenous plant hormone on praline metabolism of Swainsonia salsula seedlings under NaCl stress Effects of NaCl Stress on Praline Metabolism of Swainsonia salsula Seedling Effect of Exogenous H2O2 on Proline Accumulation and Metabolic Pathway in Leaves of Oat Seedlings under Complex Saline-Alkali Stress Effects of NaCl Stress on Proline Accumulation and Metabolic Pathways of Chicory(Cichorium intybus L.) Seedlings Effect of Salinity on Proline Metabolism of Saussurea runcinata Seedling