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Promotive effects of epibrassinolide on plant growth, fruit yield, antioxidant, and mineral nutrition of saline stressed tomato plants

Selcuk Soylemez, Cengiz Kaya and Sema Karakas Dikilitas

An experiment was designed in a glasshouse to test the mitigation effects of exogenously applied 24-epibrassinolide (EBL) on tomato (Solanum lycopersicum ‘H2274 F1’) plants grown at saline regime. The plants were subjected to 0 or 100 mMNaCl 10 days after germination and they were further grown for a week. At 17 d stage, the seedlings were sprayed with deionized water (control) or 0.5 or 1.0 µM EBL. Salinity resulted in significant decreases in dry matter, fruit yield, leaf water potential, leaf relative water content and maximum fluorescence yield (Fv/Fm), but increased proline content, electrolyte leakage (EL), hydrogen peroxide (H2O2), malondialdehyde (MDA), and activities of enzymes such as, catalase (CAT; EC., superoxide dismutase (SOD; EC,and peroxidase (POD; EC. in plants as compared to those in non-stressed plants. However, foliar application of EBL enhanced basic growth parameters, water relations and reduced the antioxidant enzymes, proline content, electrolyte leakage, and H2O2 and MDA contents. Salt stress enhanced root:shoot ratio, leaf sodium (Na+) contents and Na+:K+ ratio, but reduced mineral nutrients such as, phosphorus (P),  nitrogen (N), calcium (Ca2+ ) and potassium (K+) in the leaves and roots of both cultivars. Both doses of EBL resulted in increased N, P, K+ and Ca2+contents, whereas decreased Na+ in salt stressed plants. The findings indicate that foliar application of EBL can mitigate damage caused by salinity stress on tomato plants by lowering the levels of Na, H2O2, MDA, electrolyte leakage and increasing activities of key antioxidant enzymes in the leaves.

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