M. Kamalizadeh; M.R. Bihamta; S.A. Peyghambari; J. Hadian
Abstract
In order to evaluate the effect of titanium dioxide nanoparticles on the production of rosmarinic acid and chlorogenic acid, this nanoparticle with eight different concentrations (0, 5, 10, 20, 30, 50, 100 and 15 ppm) in a completely randomized design with three replications at flowering stage was sprayed ...
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In order to evaluate the effect of titanium dioxide nanoparticles on the production of rosmarinic acid and chlorogenic acid, this nanoparticle with eight different concentrations (0, 5, 10, 20, 30, 50, 100 and 15 ppm) in a completely randomized design with three replications at flowering stage was sprayed on Urmia genotype of Dragonhead (Dracocephalum moldavica L.) planted in the greenhouse, college of agriculture, Tehran university. At full flowering stage, plant shoots were harvested and dried in the shade for a week and then the amount of two major phenolic compounds of extraction were analyzed by high-performance liquid chromatography. Excel and SAS software were used for statistical analysis. Results showed statistically significant differences among different treatments. The production of these two compounds raised in low concentration of nanoparticle treatment up to 30 ppm extract, whereas rosmarinic acid content was decreased in high concentration of nanoparticle treatment. Average content of rosmarinic acid and chlorogenic acid in Urmia genotypes was 123.2 and 54µg/g extract, respectively. Therefore, nanopartcle induced the production rate of phenolic compounds in low concentration.
Kh. Karimzadeh; F. Sefidkon; N. Majnoon Hosseini; S.A. Peighambari
Abstract
To study the effect of different levels of soil moisture, zeolite and biofertilizers on physiological characteristics, yield and essential oil of medicinal plant Dracocephalum moldavica L., this research was performed in 2010 at Tehran university research greenhouse. For this purpose, a factorial split-plot ...
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To study the effect of different levels of soil moisture, zeolite and biofertilizers on physiological characteristics, yield and essential oil of medicinal plant Dracocephalum moldavica L., this research was performed in 2010 at Tehran university research greenhouse. For this purpose, a factorial split-plot experiment in RCBD with 4 replications was used. In this study the main plots included different soil moisture levels (90%, 60% and 30 % FC) and subplots consisted of two levels of zeolite (zero, 8gr 4kg-1 soil) along with four levels of biofertilizers (without biofertilizer, nitroxin, biphosphorous, nitroxin+biphosphorous). Results showed that the highest amount of total, a and b chlorophylls, relative water content and yield of essential oil were obtained through %90 FC, but the highest amount of solution carbohydrates, proline and percentage of essential oil were obtained through %30 FC. The maximum amount of studied physiological traits as essential oil percentage and essential oil yield were obtained from application of nitroxin+biophosphorous. Interaction effects of soil moisture, zeolite and biofertilizers showed significant differences among different treatments on amount of a, b and total chlorophyll, relative water content, percentage and yield of essential oil. The maximum amount of oil yields were obtained from zeolite application and combination of nitroxin+biphosphorous and 60% FC and treatment of no consumption of zeolite and combination of nitroxin+biphosphorous with 90% FC. It could be concluded that moderate drought stress (60% FC) with application of zeolite and combination of nitroxin+biphosphorous is beneficial for Dragonhead essential oil yield.
P. Sarkheil; M. Omidi; S.A. Peyghambari; S. Davazdahemami
Abstract
Seeds were cultured on Whatman paper by sterile water in cube, solid MS and solid MS. Seeds were not germinated on medium but 80% of seeds were germinated on Whatman paper, so this method is used as a basic method. Seeds were germinated after four days and after two weeks of culture they had normal roots, ...
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Seeds were cultured on Whatman paper by sterile water in cube, solid MS and solid MS. Seeds were not germinated on medium but 80% of seeds were germinated on Whatman paper, so this method is used as a basic method. Seeds were germinated after four days and after two weeks of culture they had normal roots, shoots and leaves. Cultures were incubated at 25◦ ±2◦C and exposed to 16 hours light per day. Explants were cultured on MS medium supplemented with 3% sucrose and solidified with 0.8% (w/v) agar. The pH of the medium was adjusted to 5.8 before autoclaving. Different types of explants were used for this experiment; root, crown, apical meristem, hypocotyls and leaf. Between different kinds of explants leaf didn’t response to callogenesis. The effects of different combinations of 2,4-D (2,4-Diclorophenoxy acetic acid) and BAP (6-Benzylaminopurine) were studied. Subculture was done every 3 weeks. In order to determine regeneration ability, the initiated callus were transferred to a regeneration medium which was composed of macronutrient, micronutrient and organic components of MS, 2,4-D (0.2 mgL-1), BAP (0.5, 2, 4, 15, 20 and 25 mgL-1) and MS without hormones, 0/3% sucrose, pH 5.8 for 4 weeks. In the presence of 2,4-D (2 and 4 mgL-1) and BAP (0.25 and 0.5 mgL-1) in the callus induction medium, high callus production percentage was reported. The hypocotyls, in contrast to the primary leaf explants, and apical meristem segments were more responsive to the tested combinations of 2,4-D and BAP. The callus from all explants was soft, watery and loose friable. During subculture period, hypocotyls and apical meristem were proliferated more on medium with the addition of (0.25 and 0.5 mgL-1) BAP and (2 and 4 mgL-1) 2,4-D than the medium contain BAP (1 mgL-1) and 2,4-D (8 mgL-1). The present study, in F. vulgare MS media without any hormone was sufficient to regenerate the plantlet from the hypocotyls, roots and apical meristems explants. In MS medium supplemented with BAP (0.5, 2 and 4 mgL-1) and 2,4-D (0.2 mgL-1) shoots were formed earlier when the number of subculture was increased 4 times.
