Evaluation of the application of gibbrellic acid and titanium dioxide nanoparticles under drought stress on some traits of basil (Ocimum basilicum L.)

Abstract

This study is carried out to study the effect of Gibberellic acid (GA3) and Titanium Dioxide Nanoparticles (NanoTiO2) on some characteristics of medicinal plant of Ocimum basilicum Lamiaceae) under drought stress. The experiment was conducted as a factorial arrangement in randomized complete block design with four replications in which A, B, C are the three factors and factor A is related to the irrigation content as fc 100%, fc 70% and fc 40% and factor B in three levels with GA3 application with concentrations of 0 (control), 250 ppm, 500 ppm and factor C with three doses of titanium nanoparticles with concentrations of 0%, 0.01% and 0.03%. The results showed that the drought stress caused to decreasing of plant biomass and the foliar relative water content, and the increasing of catalase and the level of anthocyanin in the medicinal plant of basil, while, the application of gibberellin and titanium nanoparticles caused to improving of the negative effects of the stress.The results of the study indicated that the drought stress causes to decreasing of quantitative and qualitative characteristics of the plant. The best treatments were recognized as follows: in 100% irrigation regime, non-application of gibberellin and application of Nano-TiO2 with concentration of 0.01%; in 70% irrigation regime, the application of gibberellin with concentration of 250 ppm and Nano-TiO2 with concentration of 0.03%; and in 40% irrigation regime, the application of gibberellin with concentration of 500 ppm and Nano-TiO2 with concentration of 0.03%.