Effect of Exogenous Tryptophan on Primary Metabolism and Oxidative Stress and Their Relationship with Seedling Germination and Vigor of Glycine Max L.

Treatments that increase the germination potential and vigor of Glycine max seedlings are continuously being stimulated, with aim achieving a higher percentage emergence better performance in field. Considering relationship tryptophan germination-associated phytohormones, this study tested hypothesis exogenous supply to soybean seeds can affect germination, physiological vigor, accumulation primary oxidative metabolism molecules seedlings. Soybean were exposed soaking solutions containing different concentrations amino acid (0, 25, 50, 100, 200 µM), evaluated at three time periods, 8 h after sowing (HAS), 5 14 days (DAS). Treated showed fitness greater these parameters increased increasing tryptophan. In initial hours process evaluation (14 HAS DAS), activities starch enzymes (α- β-amylase) tended be higher, resulting contents sucrose, reducing sugars, total soluble solids DAS, constituting an important metabolic effect for seedling growth. On other hand, induction promoted by occurred stimulating pathways stress, H2O2, malondialdehyde, proline tissues. Additionally, it led antioxidant superoxide dismutase ascorbate peroxidase. These responsive supplied Thus, stress induced auxin seems inductive pathway G. seeds.