Seed priming effects on growth, lipid peroxidation, and activity of ROS scavenging enzymes in NaCl-stressed sorghum seedlings from aged seeds

摘要

The aim of this study was to evaluate growth, lipid peroxidation, and activity of antioxidative enzymes in sorghum seedlings grown under salt stress from artificially aged and primed seeds. The experimental design was completely randomized, with four replications per treatment, in a 2×2×2 factorial arrangement that consisted of eight treatments: two seed vigor levels (aged or not), two seed types (primed or not), and two salinity levels (0 and 100 mM NaCl). In low physiological quality (aged) seeds, the osmoconditioning mitigated the salinity negative effects (NaCl at 100 mM) on seedling growth. The results suggest that osmoconditioning induced an increase in catalase (CAT) and guaiacol peroxidase (POX) activities and these enzymes protected the seedlings against oxidative damage caused by seed accelerated aging and salinity in nutrient solutions. Finally, the observed behavior for superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities suggest that changes in these enzymes in both shoot and roots could do not be induced by studied treatments, because the changes in these organs are unrelated to each other.