Comparison of an antioxidant system in tolerant and susceptible wheat seedlings in response to salt stress

Abstract

It has been demonstrated previously that the physiological and molecular analysis of seedlings of the tolerant (Om Rabia3) and susceptible (Mahmoudi) Tunisian wheat genotypes were different at short and long-term response to salinity. In this study, we examined the antioxidant defence system in seedlings of these two cultivars at short-term response to different NaCl concentrations. The findings showed that high salinity tolerance of cv. Om Rabia3, as manifested by lower decrease in its dry biomass, was associated with lower malondialdehyde and hydrogen peroxide contents, lower accumulation of the superoxide (O 2 -) in the roots and the shoots, and also lower decrease in ascorbate content than those in cv. Mahmoudi. Moreover, the expression of some genes coding for antioxidant enzymes such as the catalase, the superoxide dismutase and the peroxidase were enhanced by NaCl stress especially in the salt-tolerant cultivar. In parallel, their activities were increased in response to the same condition of stress and especially in the cv. Om Rabia3. Taken together, these data suggested that the capacity to limit oxidative damage is important for NaCl tolerance of durum wheat.

Agronomical, Physiological and Biochemical Characterization of In Vitro Selected Eggplant Somaclonal Variants under NaCl Stress

“…In 'R18', 'R19', 'R23' and 'R30', the most elevated salt concentration (160 mM NaCl) generated the highest CAT activity, thus leading to improved protection against ROS in all the regenerated plants. This result agrees with previous reports, stating that many salt-tolerant species exhibited higher CAT activity, such as maize [136], sesame [137], potato [138], melon [139] and wheat [140]. Several earlier authors reported that salinity increased APX activity in many salt-tolerant cultivars [106,137,141].…”

Comparison of Biochemical, Anatomical, Morphological, and Physiological Responses to Salinity Stress in Wheat and Barley Genotypes Deferring in Salinity Tolerance

“…Our research corroborates previous studies [47,48] had measured an enhanced activity of SOD, POD, and CAT in plants treated with a high NaCl dose and the activities of these enzymes were again higher in the two tolerant genotypes. Feki et al [66] and Koca et al [67] also demonstrated that tolerance to salinity in wheat and sesame genotypes was associated with lower MDA contents and higher activities of antioxidant enzymes. Thus, it is evident from our results and the results of others [10,68] that the higher POD, CAT, and APX activities coordinate with SOD activity to deal with the undesirable effect of O 2 − and H 2 O 2 and the activities of these enzymes are strongly correlated with tolerance to salt-induced oxidative stress in wheat and barley.…”

Exogenous Application of Zinc to Mitigate the Salt Stress in Vigna radiata (L.) Wilczek—Evaluation of Physiological and Biochemical Processes

“…An enzymatic antioxidant system (SOD, POD, CAT, APX, GR AND GST) protects plants against oxidative damage of salinity [ 61 , 62 , 63 ] ( Figure 5 ). Zinc also resulted in increased antioxidant enzyme activities.…”