Response of Tobacco (Nicotiana tabacum L.) Plants to Foliar Application of Brassinosteroids (BRs) under Conditions of Drought-induced Oxidative Stress

In this work, we studied the effect of treatment with Brassinosteroid at concentrations (0.01, 0.05 and 0.1 mM) on some biochemical and production characteristics of tobacco plants under conditions of applied drought stress (15%, 30% and 45%).

Chlorophyll content in leaves decreased under conditions of drought stress, and H2O2, proline, MDA and Protein increased steadily with increasing applied stress, while Chlorophyll content in leaves increased when sprayed with Brassinosteroid, especially at low concentrations (0.01 mM).

The treatment with the reduced concentration of Brassinosteroid and the applied stress outperformed all treatments and the control for all indicators studied. Therefore, it is recommended to use Brassinosteroid, especially at a concentration of 0.01 mM, on tobacco plants because of its role in improving chemical traits under conditions of drought stress.