چکیده
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Considering titanium dioxide nanoparticles (TiO2 NPs) role in plant growth and especially in plant
tolerance against abiotic stress, a greenhouse experiment was carried out to evaluate TiO2 NPs efects
(0, 50, 100 and 200mgL−1) on agronomic traits of Moldavian balm (Dracocephalum moldavica L.) plants
grown under diferent salinity levels (0, 50 and 100mM NaCl). Results demonstrated that all agronomic
traits were negatively afected under all salinity levels but application of 100mgL−1TiO2 NPs mitigated
these negative efects. TiO2 NPs application on Moldavian balm grown under salt stress conditions
improved all agronomic traits and increased antioxidant enzyme activity compared with plants grown
under salinity without TiO2 NP treatment. The application of TiO2 NPs signifcantly lowered H2O2
concentration. In addition, highest essential oil content (1.19%) was obtained in 100mgL−1TiO2 NPtreated plants under control conditions. Comprehensive GC/MS analysis of essential oils showed that
geranial, z-citral, geranyl acetate and geraniol were the dominant essential oil components. The highest
amounts for geranial, geraniol and z-citral were obtained in 100mgL−1TiO2 NP-treated plants under
control conditions. In conclusion, application of 100mgL−1TiO2 NPs could signifcantly ameliorate the
salinity efects in Moldavian balm.
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