Antioxidant systems and free proline content in different genotypes of soybean

Abstract

Superoxide dismutase and guaiacol peroxidase activities, lipid peroxidation intensity, free proline, protein and glutathione contents were measured in 20 soybean cultivars and hybrids. In addition, the total non-enzymatic antioxidant activity of plant extracts was evaluated by the DPPH-radical scavenging activity assay. Several different but compatible antioxidant systems were established in examined soybean genotypes. On the basis of the results obtained more tolerant genotypes with higher free proline and glutathione contents, higher enzymes and DPPH-radical scavenging activities were chosen. The selected genotypes could be used in field production as well as in breeding.