Rezvan Mohammadi; Parto Roshandel
Abstract
In the present study, the effect of seed priming with magnetic field (MF; 45, 90, 200 and 250mT for 5, 10, 20 and 30 min) was evaluated in 60-day-old Hyssopus officinalis plants grownunder 8 days irrigation intervals. The assessments were consisted of biomass, membranestability, photosynthetic pigments ...
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In the present study, the effect of seed priming with magnetic field (MF; 45, 90, 200 and 250mT for 5, 10, 20 and 30 min) was evaluated in 60-day-old Hyssopus officinalis plants grownunder 8 days irrigation intervals. The assessments were consisted of biomass, membranestability, photosynthetic pigments concentrations, polyphenols content, antioxidant enzymesactivities and antioxidant capacity. In comparison with the exclusively water-stressed plants,MF-priming significantly altered these parameters, particularly at 200 mT/5 min. At thisintensity, the level of biomass, total chlorophyll and polyphenols content increased by 2.2, 2.5and 7.7 folds, respectively. Furthermore, electrolyte leakage and MDA content decreased by35 and 33%. Reducing power, DPPH and superoxide anion scavenging activities highlyaugmented by MF. MF-priming at 200 mT increased catalase (+92%) and ascorbateperoxidase (+2.3 folds) activities. But, the highest activity of guaiacol peroxidase wasrecorded for MF-primed H. officinalis at 90 mT. In conclusion, seed priming with MFincreases drought tolerance in H. officinalis through protection of cellular membrane integrity,maintenance of photosynthetic pigments content and also alternation of antioxidant enzymeactivities. It also improves medicinal properties of the shoots via increasing polyphenolsconcentration and antioxidant capacity.
Raziyeh Robatjazi; Parto Roshandel; Sa’dollah Hooshmand
Abstract
In the present study, improvement of salt tolerance in basil (as a salt-sensitive plant) was investigated through silicon (Si) nutrition. Basil plants were subjected to silicon (0, 3 mM) and salinity (0, 50, 100, 150 and 200 mM NaCl) for a duration of one month. Salt stress significantly decreased the ...
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In the present study, improvement of salt tolerance in basil (as a salt-sensitive plant) was investigated through silicon (Si) nutrition. Basil plants were subjected to silicon (0, 3 mM) and salinity (0, 50, 100, 150 and 200 mM NaCl) for a duration of one month. Salt stress significantly decreased the biomass of basil. Si supplement (3 mM) resulted in a considerable increase (averagely +135%) in the biomass of salinized plants. Salt stress significantly decreased photosynthetic pigments concentrations, but Si supplement improved total chlorophyll concentration (averagely up to +217% compared to salinized plants). This improvement in pigment concentrations also occurred for carotenoids content (+123%). Salinity increased lipid peroxidation and H2O2 level in the aerial parts of the basil plants, but Si decreased lipid peroxidation (-49.1%) and H2O2 content (-29%) under salinity condition. Results showed salinity (alone) or together with Si, increased the level of polyphenols and also the level of radical scavenging activities in the aerial parts of basil but this effect was much more in plants co-treated with Si and salinity. Si nutrition increased the activity of SOD, APX and GPX in response to salt stress, but it did not affect CAT activity. Overall, Si supplement could induce salt tolerance in basil plants by improving photosynthesis, membrane integrity, and detoxification of toxic radicals. Furthermore, silicon increased the medicinal properties of basil via elevating its antioxidant capacity under salt stress.
