Atividade antioxidante de plântulas provenientes de sementes de arroz armazenadas em diferentes temperaturas por 10 anos - DOI:10.5039/agraria.v12i2a5428

Seed deterioration can occur in premature maturation and bad storage conditions. In these two cases, the excessive production of the reactive oxygen species (ROS) has contributed for losses in physiological potential seeds. Thus, the objective of this study was to evaluate the physiological potential and antioxidant enzymes in rice seedlings against 10 years storage conditions at different temperatures. The cultivars BRS Pelota, BRS Atalanta and BRS Firmeza were kept in waterproof bag at -15, 1 and 18 oC until evaluation. Then, the physiological potential and antioxidant enzymes (SOD, CAT and APX) were estimated. Storage at -15 and 1 oC provided the best physiological potential conditions of cv. BRS Pelota, Atalanta and Firmeza. These results were compatible with the enzymatic activity of seedlings from seeds stored at different temperatures. Storage at 18 °C was detrimental to the maintenance of physiological potential of the cv. BRS Pelota, Atalanta and Firmesa over 10 years. The lower activity of antioxidant defense system enzymes the higher seed liveliness.