| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 2075614 | Biocatalysis and Agricultural Biotechnology | 2016 | 11 Pages |
In the present study, effect of different levels [0, 25,75 and 150 kg NO3− ha−1 sand correspond to N0 (deprived), N25 (sub-optimum), N75 (optimum) and N150 (supra-optimum)] of nitrate in eggplant (Solanum melongena L.) seedlings under NaCl (NaCl1, 0.3 g kg−1 sand and NaCl2, 0.5 g kg−1 sand, respectively) stress was investigated. Growth, photosynthetic pigments and K+ content in test plant were declined by both the doses of NaCl. Furthermore, fluorescence parameters (JIP-test): Fm/F0, Fv/F0, Fv/Fm or ϕP0, ϕE0, Ψ0, PIABS, ABS/RC, TR0/RC, ET0/RC and DI0/RC were also affected by NaCl but toxic effects of NaCl on photosystem II photochemistry were ameliorated by N. NaCl increased accumulation of Na+ and oxidative stress biomarkers: superoxide radical, hydrogen peroxide, lipid peroxidation and electrolyte leakage despite increased activities of superoxide dismutase, peroxidase, catalase and glutathione-S-transferase. N addition caused enhancement in NaCl-mediated decline in endogenous proline and activity of Δ1-pyrroline-5-carboxylate synthetase (P5CS), while the activity of proline dehydrogenase decreased. The results indicate that different levels of N significantly modulated NaCl-induced damaging effects in eggplant. Further, results suggest that after N addition Na+ content, enzymatic antioxidants, and pool of free proline and activity of P5CS are finely regulated, which might be associated with the mitigation of NaCl stress and this effect was more pronounced with supra-optimum level of N.
