جستجوی مقالات مرتبط با کلیدواژه "ژرانیول" در نشریات گروه "علوم پایه"

Biological and chemical fertilizers have important effects on the growth and development of plants and consumption of these fertilizers has increased quantitative and qualitative production in plants. In this study, the effects of biological fertilizers such as Botamisol, Humic acid, horse manure, sheep manure, cow manure, poultry manure, vermicompost and complete chemical NPK with two controls (water foliar application and without any foliar application) and three levels of drought stress (field capacity, 50% and 75% loss of gravitational water) on morpho-physiological characters and the content/composition of the essential oil of Rosa damascenawere investigated. This research was performed in a randomized complete block design in a factorial layout with three replications. From thirteen essential oil components, the most components were Citronellol, Geraniol (alcoholic oxygenated monoterpenoides), Heneicosane and Nonadecane (alkane hydrocarbons). Heneicosane (33.6 % and 34.6 %) had the highest amounts of essential oil components. Treatments of poultry manure, vermicompost or complete chemicals in field capacity conditions increased the height of the plant (214.4 cm and 212.1 cm), number of stems (23.1 and 22.2), total chlorophyll (18.3 and 18.1 mg.Kg FW-1), R.W.C (68.4 and 69.5), petal yield (7651.5 and 7591.2 Kg.ha-1) and content of essential oil (0.076 and 0.069%). Suggest to obtain the highest quality of essential oil in damask rose, such as important components (Citronellol, Geraniol) in the same condition, using poultry manure and complete chemical fertilizers.

Essential oil is one of the most important natural products of damask rose petals (Rosa damascena Mill.). The presence of higher concentrations of aromatic compounds (β-citronellol and geraniol) in the damask rose essential oil indicates an important quality and standard indicator that foliar spraying may be effective in promoting this effective substance. The aim of this study was to evaluate the effect of alcoholic and ketone foliar application on the chemical composition of R. damascena essential oil during 2017-2018 and 2018-2019 in a completely randomized design in a rose garden located in the south of Shahrekord, southwestern Iran. The essential oil obtained by hydro-distillation was analyzed using GC/MS. In this regard, 29 compounds were identified in the essential oil, the most important of which were β-citronellol and geraniol (alcoholic monoterpenes) and henicosan and nonadcan (alkane hydrocarbons). The results indicated that the best foliar treatment was 20% ethanol solution during two experimental years; the highest levels of β-citronellol (33%) and geraniol (18%) were obtained from the ethanol spraying (at 20%) compared to other treatments and controls. In addition, this treatment was at the lowest level in terms of the concentration of alkane hydrocarbons in essential oil as a negative indicator of aromatic compounds of the rose essential oil. The acetone foliar spraying had the highest amount of alkane hydrocarbons and the lowest percentage of aromatic compounds compared to control and other treatments. In correlation's Pearson coefficients analysis, the highest significant positive correlation was obtained between aromatic compounds (alcoholic monoterpenes) with each other and between alkane hydrocarbons, meanwhile negative and significant relationships were observed between these two groups of important compounds in the rose essential oil. Finally, it is suggested that to obtain the highest quality of the R. damascena essential oil under similar climatic conditions (cold and semi-arid), the ethanol foliar application with a concentration of 20% can be useful.

In this research the effects of organic and chemical fertilizers on morpho-physiological traits (height of plant, number of lateral stem, relative water content in leaf, fresh and dry matter of plant), essential oil content and composition of Dragonhead were investigated. This research was conducted in a randomized complete block design with 4 replications in 2019 and 2020. Treatments were: control (no fertilizer), cow manure, sheep manure, poultry manure, horse manure, vermicompost and NPK fertilizers (20-20-20). Shoot of plant samples before flowering stage in end of vegetative stage (200-210 leaf) prepared from treatments separately. The most weight of dry matter (11.9-14.7 g.plant-1) and essential oil content (1.1-1.05%) was observed in chemical fertilizer that was the same group with vermicompost and poultry manure. Geraniol, geranial and geranyl acetate are classified as non cyclic monoterpene, and made more than 70% of essential oil content in different treatments. There were 18 components in essential oil of treated plants. The greatest amount of major components were geraniol (31.2-34.2 %) in NPK fertilizer and vermicompost, geranial (26.7-27.3%) in NPK fertilizer; and geranyl acetate (28.7-25.9%) in vermicompost. In two years observed that the most significant correlation indices were between essential oil content with linalool, limonen, geranial, geraniol, neryl acetate, and geranyl acetate. It seems that organic fertilizers increased the nutrient uptake and assimilation and consequently the amount and components of essential oil of the plant increased.

Alzheimer’s disease is one of the most important neurodegenerative diseases occurring after the production of free radicals and inflammatory factors. Geraniol, which is a natural monoterpene, contains antioxidant and anti-inflammatory effects. The aim of this study was to investigate the effects of Geraniol and exercise on memory and learning, SOD activity and MDA serum level, neurogenesis and amyloid plaque count in Alzheimer’s Wistar rats. To create the Alzheimer's disease model, Aβ 1-42 was injected bilaterally into the hippocampus of male rats. Grouping included control (-), control (+), exercise, Alzheimer, Alzheimer + exercise, Alzheimer + Geraniol, and Alzheimer + Geraniol + exercise. The results showed that SOD activity and MDA serum level were significantly increased in the Alzheimer + Geraniol, Alzheimer + exercise, and Alzheimer + Geraniol + exercise groups compared to other groups (P<0.001). In addition, shuttle box behavioral test demonstrated that the entry time to the dark box was notably increased in Alzheimer + Geraniol and Alzheimer + Geraniol + exercise groups compared to Alzheimer and Alzheimer + exercise groups (P<0.001). Moreover, neurogenesis was remarkably increased in Alzheimer + Geraniol and Alzheimer + Geraniol + exercise groups compared to Alzheimer and Alzheimer + exercise groups (P<0.001). Besides, the number of amyloid plaques was decreased Alzheimer + Geraniol and Alzheimer + Geraniol + exercise groups compared to other groups (P<0.001). Based on the results of this study, it seems that this compound along with exercise is notably capable of improving complications in memory, SOD activity, MDA serum level, and neurogenesis as well as amyloid plaques in Alzheimer’s disease.

Rose-scented geranium is a foliage pot plant which its indoor use is widespread. It also has an ever-increasing use in the perfume industry, cosmetics and pharmaceuticals. In order to improve the quantitative and qualitative characteristics of this house plant, the effect of salicylic acid and potassium sulfate was investigated. The factorial experiment was based on a CRD with four replications and conducted in the greenhouses of the department of horticultural sciences at Shiraz University. Foliar spray of salicylic acid and potassium sulfate were conducted at four concentrations of 0, 100, 200 and 300 mg/l, and 0, 0.5, 1 and 1.5 % respectively. The results showed that the interaction of salicylic acid and potassium sulfate on yield and quality of essential oils. According to the results, the treatment of 200 ppm salicylic acid and 1.5% potassium sulfate resulted in the greatest essential oil yield (1.01%). Geraniol and citronellol had the greatest abundance in the essential oils by 300 ppm salicylic acid application.

Lippia citriodora H.B.K. was imported in Iran for food and medical industry. In this research due to essential oil composition and antifungal activity, the aerial parts of plant in before and after flowering satages were collected from the field in Khuzestan in June 2011. The Essential oils were obtained by hydro distillation (Clevenger apparatus) and were analyzed by (GC) and (GC - MS). To measure antimicrobial activity, the methanolic extracts of these organs were prepared by percolation method and antimicrobial activity were measured against four gram-positive and negative strains of bacteriaand two fungi starins by disk diffusion method in inhibition zone diameter. Results were showed that the geraniol (35.78%) and zingiberene (19.9%) were the main compounds of essential oil in before flowering, althought the davanone (36.4%) and p-cymene (16.5%) were predominant components in after flowering stage. The tested fungi and gram-positive bacteria were showed higher sensitivity to the concentrations of plant extracts than gram-negative bacteria. In addition, the antimicrobial effects increased with increasing concentrations of the extracts. There was no significant difference between the degree of antimicrobial activity of vegetative and reproductive extracts.