Roya Razavizadeh
Abstract
TodayToday, synthetic nanoparticles encompass a wide range of particles with unique properties and have many applications in the field of nanotechnology. Due to the emergence and lack of understanding of the consequences of using nanoparticles, investigating the effect of releasing these particles ...
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TodayToday, synthetic nanoparticles encompass a wide range of particles with unique properties and have many applications in the field of nanotechnology. Due to the emergence and lack of understanding of the consequences of using nanoparticles, investigating the effect of releasing these particles in the environment at various biological levels is important. In this study, the effects of nanoparticles of silver in concentrations of 0, 2.5, 5, 10, 20, 40, 80 and 100 ppm on physiological parameters such as total anthocyanin, total soluble protein and enzyme activities of Catalase, Ascorbate peroxidase and Superoxide dismutase in tomato seedlings (Solanum Lycopersicon) under in vitro were evaluated. The results showed that anthocyanin levels in response to the presence of silver nanoparticles decreased significantly to 10 ppm concentration. The total protein soluble protein increased with increase in the concentration of nanoparticles in the shoot and decreased with increasing concentrations at 20 and 40 ppm compared to the control. The intensity of expression of six protein bands treated with silver nanoparticles also changed. Increasing the concentration of nanoparticles in the medium increased the activities of catalase and superoxide dismutase and decreased ascorbate peroxidase activity in the roots. However, in shoot, increased activity of peroxidase and catalase, and decreased activity of superoxide dismutase in response to high concentrations of silver nanoparticles. The results indicated that the presence of silver nanoparticles in the tomato culture medium leads to responses at physiological and molecular levels.
Rooya Razavizadeh; Fatemeh Adab Avazeh; Akram Gaderi Samani
Abstract
Thymus vulgaris is a plant of the Lamiaceae family, with numerous medicinal, antioxidant and nutritional properties. Growth and crop productivity and antioxidant activities of the plant are affected by many environmental factors such as drought. Therefore, a controlled experiment under in vitro conditions ...
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Thymus vulgaris is a plant of the Lamiaceae family, with numerous medicinal, antioxidant and nutritional properties. Growth and crop productivity and antioxidant activities of the plant are affected by many environmental factors such as drought. Therefore, a controlled experiment under in vitro conditions was conducted to evaluate the effects of drought stress on growth, accumulation of compatible metabolites and antioxidant activity of thyme seedlings. Seedlings of thyme were cultured in MS medium containing 0, 2 and 4% sorbitol and mannitol for 14 days. Both sorbitol and mannitol were found to reduce the growth parameters, photosynthetic pigments but increased the proteine, secondary metabolites and catalase and ascorbate peroxidase activity. Compared to the control, both treatments led to a significant decrease in superoxide dismutase activity at 4% while no significant differences were observed between control and mild stress (2%). Moreover, the results indicated that the accumulation of compatible metabolites, proline and the reducing sugar contents in leaves and roots, increased significantly with increasing drought concentration in the culture media. Increased compatible metabolites, secondary metabolites and antioxidant enzymesactivities could consider as a defensive reaction of thyme against drought stress.
Nasim Seyedipour; Fariba Sharif nia; Fahimeh Salim pour; Roya Razavi Zadeh
Abstract
Hawthorn (Crataegus L.) belongs to Crataegeae tribe، Maloideae subfamily and Rosaceae family. It has about 150 – 1200 species in the world. In this study، revision of two species C. meyeri and C. persica was investigated in Iran، by using morphology of different organs and micromorphology ...
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Hawthorn (Crataegus L.) belongs to Crataegeae tribe، Maloideae subfamily and Rosaceae family. It has about 150 – 1200 species in the world. In this study، revision of two species C. meyeri and C. persica was investigated in Iran، by using morphology of different organs and micromorphology of pyrenes. Results indicated that species C. persica reported from west and central of Iran، is synonym of species C. meyeri، this result was concordant with monograph of Crataegus.
