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Keywords
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aromatic plants, drought stress, malondialdehyde,
reactive oxygen species,TiO2NPs
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Abstract
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Water-deficit stress is the most important environmental
factors limiting plant growth, and production. Nano-titanium
dioxide (nano anataseTiO2) can have various profound effects
on the crop physiological, biochemical and morphological
characteristics. In the present research, the influences of
different concentrations ofTiO2 nanoparticles (NPs) (0, 10 and
40 ppm) and water-deficit stress on Dragonhead
(Dracocephalum moldavica L.) were investigated in a
factorial experiment based on randomized complete block
design with three replications. Results showed that under
normal irrigation, foliar application of 10 ppm TiO2 NPs
increased plant shoot dry mass and essential oils content.
Under water-deficit stress condition, plants treated with 10
ppm TiO2 NPs had more proline and much less H2O2 and
malondialdehyde content as compared to untreated plants.
Therefore, it can be concluded that proper concentration of
TiO2 NPs probably can be used as an exogenous stimuli for
improvement of shoot growth and essential oil content in
plants. Furthermore, water-deficit stress-induced damages
such as oxidative stress and membrane damage can be
ameliorated by foliar application of TiO2 NPs at appropriate
concentrations.
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