NaCl stress is one of the reduction reasons of the medicinal plants and crop yield. This research was aimed to investigate the effect of titanium nanoparticles under salinity stress on quality of essential oil components Dracocephalium moldavica L. The study was conducted in a completely randomized design in greenhouse, controlled environment, with Three treatments including 0 (control), 50, 100 mM NaCl and four treatments including (0, 50, 100 and 200 mg/1) Tio2 Np with three replications per treatment The essential oil was first extracted and the active components of the essential oil were separated and identified by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) methods. By comparing the results obtained from this experiment in different treatments, contain 5 important essential oil components. the main compounds essential oil was, (Neral, Geraniol, Geranial, Nneryl Acetate and Geranial Acetate) That Effects on plants The highest percentage of Nerol was 0.55% That treated with a concentration of 50 mg/l titanium nanoparticles and 100 mM salinity, and the highest percentage of Geraniol was 7/51%, in 100 mg/l titanium dioxid NPS and control salinity condition. The highest percentage of Geranial (E-citral) was 44.5% in 50 mg/l titanium nanoparticles and 0 mM salinity. And the highest percentage of Geranyl acetate was 22.01% and Neryl acetate 0.92, in un-titanium dioxide NPS treatment and 50 Mm salinity compared to the control. in plants treated with titanium dioxide, NPs 100 and 50% salinity were more than other treatments and controls, such as menthol and Linalool (0/71%,.1/46%) respectively. therefore, in the present research, titanium dioxide nanoparticles treatment in low concentrations improved the harmful effects of salinity stress and resistance of Dracocephalium moldavica L plant and increased yield essential oil by effects on essential oil components.
