Abstract :
In this study, 150 mM NaCl salt stress was applied to five tomato genotypes that are two sensitive (TR-47882, TR-47815), two tolerant (TR-68-516, TR-55711) and one wild (PI-899-01) one. Then, depending on time, different concentrations of nitrogen (0.5% and 1%) were applied to leaves. According to the results of the application, it was determined that the sensitive and tolerant genotypes were affected by the salt stress on different levels. Of the antioxidant enzyme activities, superoxide dismutase (SOD: EC 1.15.1.1), glutathione reductase (GR: EC 1.6.4.2), ascorbate peroxidase (APX: EC 1.11.1.11) and catalase (CAT: EC 1.11.1.6) and the amount of MDA and chlorophyll were measured. enzyme activities in the tolerant genotypes increased while they decreased in the sensitive ones. The MDA and chlorophyll values also supported the enzyme activities positively. As a result of the nitrogen application, according to the results of analyses, tolerant genotypes were not affected by the salt stress while sensitive ones were affected to a great extent. Based on these results, it was concluded that dose of 1.0% nitrogen application plays a critical role in protection against salt stress and has the effect of increasing tolerance.
NaturalLanguageKeyword :
nitrogen , salt stress , tomato , antioxidant enzymes
