M. Salek; S. Saadatmand; R.A. Khavari-Nejad; H. Zeinali
Abstract
In order to study the mineral elements of Rubia tinctorum L. under salinity conditions, four levels of nitrogen fertilizer (0, 60, 120, 180) kg ha-1 in the form of urea, and four levels of phosphorous fertilizer (0, 60, 120, 180) kg ha-1 in the form of triple super phosphate were used. The study elements ...
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In order to study the mineral elements of Rubia tinctorum L. under salinity conditions, four levels of nitrogen fertilizer (0, 60, 120, 180) kg ha-1 in the form of urea, and four levels of phosphorous fertilizer (0, 60, 120, 180) kg ha-1 in the form of triple super phosphate were used. The study elements were nitrogen, phosphorus, sodium, calcium, iron, and zinc. The experiment was conducted in a research farm in Isfahan and was arranged as factorial based on a randomized complete block design with three replications. The results demonstrated that the effects of nitrogen and phosphorous fertilizers on element concentration were significant. Nitrogen and phosphorus fertilization could increase the content of N, P, Ca, Fe and Zn and decrease of Na and improved Rubia yield. The interaction between nitrogen and phosphorous fertilizers had more positive impacts on yield and nutrient accumulation as compared with simple effects. In the use of nitrogen and phosphorous fertilizers together, the maximum increase in yield of aerial parts was 0.43 kg m-2 (threefold more than that of the control) and the highest root yield was 0.78 kg m-2 (about twofold more than that of the control). The application of certain levels of fertilizers had notable effects on increasing nutrient concentration and yield under saline conditions. The optimum level of both urea and phosphate fertilizers was generally 180 kg ha-1 and if these levels of fertilizers are used together, it would give more desirable outcome.
K. Dialmaghani; R. Kharvari-Nejad; H. Fahimi; H. Hekmat- shoar
Abstract
Hyoscyamus pusillus from Solanaceae family is a medicinal plant producing tropane alkaloids. For investigation of tropane alkaloids levels in H. pusillus, plant materials were collected during three different growth stages, vegetative stage, flowering stage and fruiting stage, from two regions of Azarbayjan, ...
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Hyoscyamus pusillus from Solanaceae family is a medicinal plant producing tropane alkaloids. For investigation of tropane alkaloids levels in H. pusillus, plant materials were collected during three different growth stages, vegetative stage, flowering stage and fruiting stage, from two regions of Azarbayjan, Marand and Tabriz. After extraction and purification of alkaloids from different parts of plants (root, stem, leaves, flowering tops and seeds), were assayed by HPLC. Furthermore, in two regions effects of environmental factors upon tropane alkaloid levels were investigated. The results showed that hyoscyamine and scopolamine content varied in three stages and in different parts of plants. The highest level of hyoscyamine in two regions was observed in leaves at flowering stage, whereas there was lowest level in stems at vegetative stage. Hyoscyamine was dominant alkaloid, with except of seeds, in all organs. Furthermore, the results showed that hyoscyamine and scopolamine content of plants in Marand region at all growth stages was higher than that of plants in Tabriz region. The results of investigation of effects environmental factors on alkaloid levels showed that some of this factors influenced production of tropane alkaloids. For example, as altitude up, alkaloid levels are raised. Furthermore, increased nitrogen and phosphorus concentrations in soil caused increasing alkaloid levels in plants. Whereas, in contrast, reduced potassium in soil caused increasing alkaloid levels. As plant grows alkaloid levels increase. This can be results from it when plant mature, high nitrogen enters hyoscyamine (and as a result scopolamine) structure.
R. Khavari-nejad; A. Asadi
Abstract
Plants produce a diverse array of secondary metabolites. These compounds may be synthesized during normal growth and development and accumulating only in response to pathogen attack or stress. Interest in these molecules stems from their medicinal properties, antimicrobial activity and their likely role ...
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Plants produce a diverse array of secondary metabolites. These compounds may be synthesized during normal growth and development and accumulating only in response to pathogen attack or stress. Interest in these molecules stems from their medicinal properties, antimicrobial activity and their likely role as determinats of plant disease resistance. Daisy (Bellis perennis L.) accumulates secondary compounds (triterpenoid saponins and anthocyanins) in response to SA and pathogens. The results of the research indicates that the amount of secondary compounds (saponins and anthocyanins) in treated plants with SA were more than in the control plants. The amount of compounds in infected plants and without SA was more than in the control plants. When infected plants were treated with SA, an increase of compounds was shown in plants. The peaks observed in HPLC and their comparision with compounds standard confirms the results mentioned above. It is concluded that SA have significantly reduced disease severity and increase the amount of secondary compounds in infected and non-infected Daisy plants.
M. Niakan; R.A. Khavarynejad; M.B. Rezaee
Volume 20, Issue 2 , July 2004, , Pages 131-148
Abstract
The effects of three levels of nitrogen fertilizer(urea)(o,100,200 Kg ha¹) with two levels phosphorus(super phosphate)(0,100 Kg ha¹) and two levels of potasium(0,100 Kg ha¹) fertilizer in different rate of N/P/K on fresh weight, dry weight,number,aera and oil contetnt ...
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The effects of three levels of nitrogen fertilizer(urea)(o,100,200 Kg ha¹) with two levels phosphorus(super phosphate)(0,100 Kg ha¹) and two levels of potasium(0,100 Kg ha¹) fertilizer in different rate of N/P/K on fresh weight, dry weight,number,aera and oil contetnt of leaf in Mentha piperita L.in field. According to the results rate of 200/200/200 Kg ha¹ of N/P/K increased fresh weight ,dry weight and number of leaf while rate of 200/100/200 Kg ha¹ of N/P/K increased leaf aera and oil content.Resuls also a positive correlation was shown between leaf aera and oil content.
M. Niakan; R. Khavarynejad; M.B. Rezaee
Volume 19, Issue 1 , May 2003, , Pages 1-14
Abstract
The effects of two levels of nitrogen fertilizer (urea) (0,100 kg ha-1) with one of levels in phosphorus (super phosphate) and potassium (potass oxide ) fertilizer (each of 100 kg ha-1) in two rate of 0/100/100 kg ha-1 (N0 p100 k100، control) and 100/100/100 kg ha-1 (N100 P100K100) on quantity and quailty ...
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The effects of two levels of nitrogen fertilizer (urea) (0,100 kg ha-1) with one of levels in phosphorus (super phosphate) and potassium (potass oxide ) fertilizer (each of 100 kg ha-1) in two rate of 0/100/100 kg ha-1 (N0 p100 k100، control) and 100/100/100 kg ha-1 (N100 P100K100) on quantity and quailty of leaf (in before flowering) and flowering branches (in flowering) oil in Mentha piperita L. under the fram condition in form spilit plot design in four repeat have been evaluated. According to the results obtained, with out regard to kind of treatment, main composition in oil included: B-ocimene, linalool, 1,8- cineole, B caryophyllene, myrcene. In rate N0 P100 K100 (control), amount of linalool and 1,8 cineole in flowering branches were more of leaf oil. In before flower enhancement of nitrogen fertilizer increased amount of linalool and 1,8 cineol and reduced amount of B-caryophyllene and B-ocimene in leaf oil. In flowering branches, applied of nitrogen fertilizer increased amount of B-ocimene and B-caryophyllene and reduced linalool and 1,8 cineole. Amount of oil in flowering branches in control was more of leaf. Increased of nitrogen fertilizer, had positive effect on content leaf and flowering branches oil.
