Effect of PEG Priming on Oxidation Resistance of Aged Oat Seeds
This study was designed to analyze the activities of superoxide dismutase (SOD),catalase (CAT),peroxidase (POD),and malondialdehyde (MDA) content in ultra-dried (4% moisture content) oat (Avena sativa) seeds.The seeds were deteriorated at 45C for 48 d,and then primed with different concentrations of PEG-6000 (0,-0.3,-0.6,-0.9 and-1.2 Mpa) for 0 (CK),3 and 6 h.This study was to explore the effect of PEG priming on physiological responses of aged ultra-dry oat seeds.The results showed that the activities of SOD,CAT and POD decreased in aged oat seeds primed with PEG at the concentration of 0 and-0.3 Mpa,leading to an increase in MDA content and decrease in germination percentage.However,the opposite trend was observed after priming with high concentration of PEG (-0.9 and-1.2 Mpa).This indicated that PEG priming repaired the damage of ageing and prevented the imbibition damage in ultra-dried oat seeds by improving antioxidant capacity.