عنوان مجله
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PLANT PHYSIOLOGY AND BIOCHEMISTRY
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چکیده
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In view of damaging impacts of cadmium (Cd) toxicity on various vital processes of plants and strategies for
alleviating these effects, selenium (Se) application has been recently achieved great attention. In addition, chitosan
(CS) and its nano-form, besides many positive effects on plants, could be considered as an excellent
adsorption matrix and a carrier for a wide range of materials like Se with various applications in agricultural
sector. For that point, the combination nano-form of Se and CS (CS–Se NPs), using CS as a carrier and control
releaser for Se, could enhance Se efficiency particularly at lower doses under stress conditions. Therefore, Se (10
mg L 1), CS (0.1%) and CS-Se NPs (in two concentrations; 5 and 10 mg L 1) were applied on Moldavian balm
plant under 0, 2.5 and 5 mg kg 1 Cd-stress conditions. The results demonstrated that mostly Se and CS-Se NPs
treatments could lessen negative effects of Cd-stress conditions through enhancing agronomic traits, photosynthetic
pigments, chlorophyll fluorescence parameters and SPAD, proline, phenols, antioxidant enzymes activities
and some dominant constituents of essential oils and decreasing MDA and H2O2. These encouraging impacts
were more significant at lower dose of CS-Se NPs (5 mg L 1) introducing it as the best treatment to ameliorate
Moldavian balm performance under Cd-stress conditions. In conclusion, CS-Se NPs could be considered as a
supportive approach in plant production mainly under different heavy metal stressful conditions and probably a
potential plant growth promoting and stress protecting agent with new outlooks for applying in agricultural
sector.
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