Document Type: Research paper

Authors

Faculty of Agriculture, Shahrekord University, Shahrekord, Iran

Abstract

In the present study, the effect of seed priming with magnetic field (MF; 45, 90, 200 and 250
mT for 5, 10, 20 and 30 min) was evaluated in 60-day-old Hyssopus officinalis plants grown
under 8 days irrigation intervals. The assessments were consisted of biomass, membrane
stability, photosynthetic pigments concentrations, polyphenols content, antioxidant enzymes
activities and antioxidant capacity. In comparison with the exclusively water-stressed plants,
MF-priming significantly altered these parameters, particularly at 200 mT/5 min. At this
intensity, the level of biomass, total chlorophyll and polyphenols content increased by 2.2, 2.5
and 7.7 folds, respectively. Furthermore, electrolyte leakage and MDA content decreased by
35 and 33%. Reducing power, DPPH and superoxide anion scavenging activities highly
augmented by MF. MF-priming at 200 mT increased catalase (+92%) and ascorbate
peroxidase (+2.3 folds) activities. But, the highest activity of guaiacol peroxidase was
recorded for MF-primed H. officinalis at 90 mT. In conclusion, seed priming with MF
increases drought tolerance in H. officinalis through protection of cellular membrane integrity,
maintenance of photosynthetic pigments content and also alternation of antioxidant enzyme
activities. It also improves medicinal properties of the shoots via increasing polyphenols
concentration and antioxidant capacity.

Keywords

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