Herbal Science
hossein mozafari; Masoumeh Hejabi; hassan salari; hakimeh oloumi
Abstract
More than 22% of the world's agricultural land is saline, and this trend continues to increase with climate changes. Salinity stress causes leaf color change, osmotic stress, ionic toxicity, prevents growth, photosynthesis and plant performance. Due to their size less than micron, metal nanoparticles ...
Read More
More than 22% of the world's agricultural land is saline, and this trend continues to increase with climate changes. Salinity stress causes leaf color change, osmotic stress, ionic toxicity, prevents growth, photosynthesis and plant performance. Due to their size less than micron, metal nanoparticles have a great absorption and transmission power in plants. Salinity stress is a major problem in hot and dry areas under tomato cultivation. For this purpose, investigating the mutual effects of the size and type of zinc oxide and iron oxide nanoparticles on the improvement and change of growth and increasing the resistance to salt stress in tomato plants of the early urbana variety were carried out in the form of a completely randomized and factorial design with 4 replications, at a significant level of 5%. In this research, zinc oxide nanoparticles in 25 and 50 nm sizes, iron oxide in 25 nm sizes and sodium chloride in 0 and 75 mM levels were used. Nanoparticles and salinity treatments were both applied to the plants. The results showed that salt stress led to a decrease in plant growth parameters such as shoot and root length, leaf area, RWC, ion leakage. Also, NaCl led to an increase in the accumulation of prolin and other aldehydes, sodium, iron and zinc. The application of nanoparticles had a slight effect in stress-free conditions, but in stressed conditions, these two nanoparticles alone and especially in combination neutralized the effect of salinity and reduced the damage caused by salinity stress.
Herbal Science
Rozita Kabiri; Mehdi Naghizadeh; Mohammad Javad Zarea
Volume 2, Issue 1 , March 2021, , Pages 9-16
Abstract
Compounds which are able to reduce damaging effects of various stresses such as drought could be of great importance. In this research, arginine was used as a precursor of nitric oxide or polyamines and the effect of this compound on alleviation of oxidative damages under drought stress has been investigated. ...
Read More
Compounds which are able to reduce damaging effects of various stresses such as drought could be of great importance. In this research, arginine was used as a precursor of nitric oxide or polyamines and the effect of this compound on alleviation of oxidative damages under drought stress has been investigated. Experimental treatments included arginine at three levels (0, 10 and 20 µmol) and, drought stress (induced by polyethylene glycol 6000) at the levels of 0, 13.5% and 17% (W/V). This experiment was conducted as a completely randomized design in a factorial arrangement with three replications. The application of arginine through the root medium, increased drought tolerance of ajwain (Trachyspermum ammi) seedlings. Arginine profoundly induced the activities of phenylalanine ammonia-lyase and, polyphenol oxidase in plants which led to reduction in electrolyte leakage and increasing in relative water content, photosynthetic pigments (chlorophyll a, b, total chlorophyll and, carotenoids), polyphenol compounds, flavonoids, anthocyanin content and, soluble sugar content. It is concluded that the application of arginine appeared to induce pre-adaptive responses to drought stress, leading to promote protective reactions. DOR: https://dorl.net/dor/20.1001.1.23833017.2021.2.1.2.2
Herbal Science
Sayed Rasoul Zaker; Shahin Gavanji; Sayedeh Sana Sayedipour; Azizollah Bakhtari; Elham Shirani Bidabadi; Behrouz Larki; Zahra Golestannejad
Volume 1, Issue 2 , September 2014, , Pages 23-34
Abstract
Nowadays, many antibiotics are being used to control infectious diseases. Inappropriate use of antibiotics leads to emergence of resistant bacteria and problems such as a prolonged course of treatment. Medicinal plants and their derivatives, as a good source of treatment, are effective against drug resistance. ...
Read More
Nowadays, many antibiotics are being used to control infectious diseases. Inappropriate use of antibiotics leads to emergence of resistant bacteria and problems such as a prolonged course of treatment. Medicinal plants and their derivatives, as a good source of treatment, are effective against drug resistance. In this study we have evaluated the antimicrobial activity of herbal essential oils of four medicinal plant Cuminum cyminum, Satureja hotensis L, Citrus limon and Mentha piperita. For preparation of herbal essential oils clevenger apparatus was used, and the active components of the herbal essential oils were determined by GC-MS. In order to observe the effects of the essential oils, they were examined on Staphylococcus aureus, Escherichia coli and Salmonella typhi using disc diffusion method in vitro. Also, the Minimal Inhibitory Concentration (MIC) and Minimal Bactericide Concentration (MBC) of each essential oil was measured and compared with commonly used antibiotics. Obtained results showed that all of the essential oils possess inhibitory and antibacterial effects, but the Mentha piperita essential oil showed a better effect in comparison to other used essential oils. It was concluded that all the herbal species demonstrate antibacterial properties, but the level of bacterial growth inhibition induced by plant materials, shown to be dependent on herbal source and bacterial strain.
DOR: https://dorl.net/dor/20.1001.1.23833017.2014.1.2.4.5