Showing 4 results for Jamei
Rashid Jamei, Soroush Kargar Khorrami,
Volume 4, Issue 11 (VOL. 4, no. 11, 2015 2015)
Abstract
In this research the effect of four concentrations of nickel and copper (25, 50, 100, and 200 µM) on root and shoot length, fresh and dry weight, leaf surface, and photosynthetic pigments (Chlorophyll a, b and carotenoids), sugar, malondialdehyde, hydrogen peroxide content and antioxidant enzyme activity (CAT and APX) in Okra plants were evaluated. The results showed that in those plants which were treated with all concentrations of copper and nickel, the content of photosynthetic pigments and leaf surface were reduced significantly in comparison with control. In this investigation it was found that shoot and root length, dry weight and fresh weight of shoot and root which were treated with concentrations 50, 100, and 200 µM of cupper and 100 and 200 µM of nickel were reduced significantly when compared with the control. Content of soluble sugars in shoot and root plants which were treated with all concentrations of nickel and concentrations 50, 100, and 200 µM of cupper increased significantly in comparison with the control. Also, content of malondialdehyde, hydrogen peroxide content and antioxidant enzyme activity (CAT and APX) increased significantly in shoot and root plants which were treated with concentrations 50, 100, and 200 µM of copper and nickel when compared with control.
Rashid Jamei, Soroush Kargar Khorrami, Reza Darvishzadeh, Siavash Hosseini Sarghin,
Volume 8, Issue 34 (vol. 8, no. 34 2020)
Abstract
Carbon nanotubes (CNTs) are known to have many unique physical and chemical properties. Because of these features, they accelerate the germination process, root growth, and photosynthesis rate that can result in increased crop productivity. In the present study, the effects of 4 multi-walled carbon nanotubes (MWCNTs) levels including 0 (control), 50 (low concentration), 100 (moderate concentration), and 200 (high concentration) mg/l were evaluated on morphological and anatomical characteristics of stem, root and leaf in two Okra cultivars namely Bamia and Emerald. In both cultivars, the value of height and biomass of shoot and root increased after addition of 50 and 100 mg/l MWCNTs. Based on microscopic results, the root and shoot diameters in both cultivars more affected by increased cortex thickness and central cylinder in 50 and 100 mg/l of MWCNTs treatments whereas these parameters were more affected by increased cortex thickness in the high concentration of MWCNTs. Our study indicated that the thickness of mesophylls and spongy layers increased in low level of MWCNT, whereas these parameters were decreased in moderate and high levels of MWCNT in both cultivars. The statistical analysis showed that Stomata size increased value in low and moderate levels of MWCNT in Bamia cultivar. In this study Stomata index measurement showed that this parameter was increased in moderate and high levels of MWCNT only in Emerald cultivar. We observed that diameter of xylem and phloem in the shoot were increased in low (50 mg/l) and moderate (100 mg/lit) levels of MWCNTs whereas these parameters were decreased in high MWCNT level. Although this study revealed that low treatments of MWCNTs caused an increase of root xylem diameter in both cultivars.
Razieh Rahmatizadeh, Hossain Mozafari, Mohammad Javad Arvin, Rashid Jamei, Noor Mohammad Barahouei Moghadam, Ahad Ebne Abdolali,
Volume 12, Issue 53 (vol. 12, no. 53 2023)
Abstract
Research in the field of nanotechnology as an emerging field has culminated in the advancement of various branches of technology. The role of iron in reducing abiotic stresses has not been widely studied despite the fact that it is considered an essential element for plant growth. Therefore, an experiment was conducted in 2017 in the greenhouse of Kerman Graduate University of Technology. In this research, the effect of Fe3O4 nanoparticles at five levels of 0, 10, 20, 50 and 100 mg/l on tomato plant subjected to cadmium chloride (CdCl2) stress with three concentrations of 0, 100 and 200 μM was evaluated. The results showed that the 200 μM CdCl2 concentration in the nutrient solution caused a significant decrease in shoot dry weight (56%), root dry weight (65.5%), shoot length (52.6%), as well as root length (56.8%) compared to the control. Besides, MDA and H2O2 content of shoots and roots increased significantly relative to the control. The change in superoxide dismutase (SOD) activity was 232.4% (3.3-fold) in the shoot and 143.5% (2.4-fold) in the root compared to the control. However, the application of 20 mg/L concentration of Fe3O4 nanoparticles was significantly effective for plant growth and improved cadmium toxicity along with reducing the concentration of free cadmium in the plant through the stimulation of various defense mechanisms. In general, the results of this research showed that spraying iron oxide nanoparticle can be useful to protect tomato plants under cadmium stress.
Mohammad Sarberahneh, Rashid Jamei,
Volume 13, Issue 63 (vol. 13, no. 63 2024)
Abstract
Salinity stress is one of the most important abiotic stresses in many areas of Iran, especially in the fields of medicinal plants, which has caused many problems. The basil plant is one of the important medicinal plants that is used in various industries due to its phenolic compounds. Climate change and rapid population growth seriously affect the world's agricultural food security. To deal with these threats, researchers must use new technologies. In this regard, so far, several nanoparticles, such as silver nanoparticles, have been used for seed germination, plant growth and tolerance to biological stresses in a number of agricultural plants. Based on this, the present study was conducted as a factorial in the form of a completely randomized design with two factors and three replications on basil seedlings. Experimental factors, including salinity at 0, 75, and 150 mM levels, were used as plant foot application and nanosilver at 0 and 75 ppm levels as foliar spraying. Some biochemical indicators, such as the content of total phenol, hydrogen peroxide and the activity of antioxidant enzymes such as superoxide dismutase (SOD), ascorbate peroxidase (AXP), catalase (CAT), guaiacol peroxidase (POX) and the enzyme phenylalanine ammonialyase (PAL), in the root and shoot, were evaluated. The obtained results showed that the simultaneous application of salt and nanosilver led to a significant increase in total phenol content in shoot and root (46.89% and 45.48% increase, respectively), increased PAL activity in shoot and root (respectively 32.51% and 41.56% increase), and also increased the activity of SOD antioxidant enzymes in shoot and root (58.97% and 43.11% increase, respectively), CAT (63.76% and 73.31%), and APX (74.18 and 31.79 percent). Also, the results showed a decrease in hydrogen peroxide content in the shoot and root compared to the control. In general, it seems that nanosilver has been able to increase the tolerance of basil plants to salt stress by reducing the content of hydrogen peroxide and increasing the activity of antioxidant enzymes and the content of phenol.
