Changes of antioxidative enzymes in salinity tolerance among different wheat cultivars

Abstract

The response of three wheat ( Triticum aestivum L.) cultivars Banysoif 1 (C1), Sakha 68 (C2) and Seds 1 (C3) to salinity stress (−1.11 MPa NaCl) at germination and early seedling growth was investigated. According to the germination, dry weight production and tissue water content, C1 seemed to be more or less unaffected by salinity, whereas C3 was severely reduced and C2 was almost intermediated. Consequently, carbohydrate, protein and free amino acids contents were increased in C1 and C2, while the opposite occurred in C3 (except soluble proteins and free amino acids). On the other hand, while proline content decreased in C2 and C3, it markedly increased in C1 as a result of salinity stress. Na + /K + ratio was higher in C3 than in C1. C2 was intermediate. Significant increase in SOD activity was observed in seedlings of C1 and C2. On the other hand, SOD activity was markedly decreased in C3 cultivar. Seedling extracts exhibited three SOD activity bands (SOD1, SOD2 and SOD3) in C1 and C2. While in C3 see...