Effects of NaCl Stress on Praline Metabolism of Swainsonia salsula Seedling Effects of NaCl stress on proline metabolism of Achnatherum splendens seedling 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 Cloning and Expression of a Proline Dehydrogenase Gene from Celastrus orbiculatus