M. Zeynali; B. Maleki Zanjani; P. Moradi; F. Shekari; S.M. Niazkhani
Abstract
Biological stresses such as drought affect the production of secondary metabolites, especially plant sterols (phytosterols). Among the phytoestrols found in pumpkin seeds, betasitosterol is one of the most important components which also have many medicinal properties. In this study, the effect of five ...
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Biological stresses such as drought affect the production of secondary metabolites, especially plant sterols (phytosterols). Among the phytoestrols found in pumpkin seeds, betasitosterol is one of the most important components which also have many medicinal properties. In this study, the effect of five levels of drought stress on seed oil production and its phytosterols was studied in three genotypes and Styriaca variety of pumpkin (Cucurbita pepo L.). Analysis of phytosterols using GC/MS showed that increasing drought stress had a negative effect on oil production from pumpkin ripe seeds, but oil phytosterols, especially betasitosterol, increased and this increase was higher in Styriaca than other genotypes. To confirm these results, the seeds were harvested 15-30 days after flowering and the expression of SQS, PP2A, SMT2, ERG26 and Cycloartenol synthase genes involved in the phytosterol biosynthesis pathway was investigated. The results indicated that, among the different levels of drought stress and genes studied, highest expression level was observed at the rainfed level and at that time, betasitosterol and stigmasterol pathway had the main activity in steroid biosynthesis pathway in pumpkin.
M. Nekookhoo; S. Fallah
Abstract
Hull-less seed pumpkin (Cucurbita pepo L.) is an important medicinal plant and its seed and byproducts are used in the treatment of many diseases. Production of this plant uses a lot of water and nitrogen. Plastic mulch application may reduce the water and nitrogen requirements. Therefore, an experiment ...
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Hull-less seed pumpkin (Cucurbita pepo L.) is an important medicinal plant and its seed and byproducts are used in the treatment of many diseases. Production of this plant uses a lot of water and nitrogen. Plastic mulch application may reduce the water and nitrogen requirements. Therefore, an experiment was conducted with the aim of evaluation of deficit irrigation and nitrogen effects on fruit, seed, and oil yield of hull-less seed pumpkin (Cucurbita pepo L.) under plastic mulch in 2016. A split plot layout in a randomized complete block design with three replications was used. Main plots included complete irrigation under plastic mulch, moderate stress (75% of complete irrigation under plastic mulch), severe stress (50% of complete irrigation under plastic mulch), normal irrigation without plastic mulch and sub-plots consisted of complete nitrogen requirement, 80% of the full nitrogen requirement and 60% of the full nitrogen requirement. The results showed that there were no significant differences between moderate stress (75% complete irrigation under plastic mulch) and normal irrigation without mulch for fruit, grain and oil yield. However, under moderate stress, the plastic mulch reduced water and nitrogen requirements by 25 and 20%, respectively and produced a grain yield and oil yield similar to complete irrigation. Therefore, this technique can be used for water conservation and sustainability of agricultural production systems in arid and semi-arid areas.
S. Maleki Khezerlu; Z. Tahmasebi Sarvestani; S.A.M. Modarres Sanavi
Abstract
To study some quantitative and qualitative traits of Cucurbita pepo L. under fertilizer and water deficit stress, a trial was conducted in the research field of Tarbiat Modares University in 2011 and 2012 cropping years. In this study, the experiment was performed in factorial randomized completely block ...
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To study some quantitative and qualitative traits of Cucurbita pepo L. under fertilizer and water deficit stress, a trial was conducted in the research field of Tarbiat Modares University in 2011 and 2012 cropping years. In this study, the experiment was performed in factorial randomized completely block design with three replications. and water deficit at three levels (normal irrigation, withholdingirrigation at milk stage, withholdingirrigation and spraying sodium chlorate at milk stage). Results showed that nitrogen fertilizer treatment significantly affected all traits studied except seed number and stress treatment had significant effects on all traits except seed number, seed length, and stearic acid content at 1% level of significance. In this study, increasing water stress reduced the content of all traits studied except linoleic acid content. In addition, increased levels of nitrogen fertilizer led to the decreased content of all traits studied. The highest values for fruit and seed weight, seed width, seed diameter, oil, linoleic, oleic, palmetic, and stearic acid were obtained at a nitrogen fertilizer level of 60kg.ha-1. Totally, nitrogen fertilizer (60kg.ha-1) and control irrigation treatments are recommended as the most suitable treatments to gain maximum seed yield.
Sh. Moazzen; J. Daneshian; S.A. Valadabadi; H. Baghdadi
Volume 22, Issue 4 , February 2007, , Pages 397-409
Abstract
Pumpkin (Cucurbita pepo) is an annual plant that has been introduced to Iran in recent years. Its effective components are used to cure some diseases such as prostat hyperplasia, control of taenia, Arleriosclerosis, regulation of alimentary canal and hormonal balance especially in women and strengthening ...
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Pumpkin (Cucurbita pepo) is an annual plant that has been introduced to Iran in recent years. Its effective components are used to cure some diseases such as prostat hyperplasia, control of taenia, Arleriosclerosis, regulation of alimentary canal and hormonal balance especially in women and strengthening men sexual appeal in advanced countries. Phosphate is one of the macro-elements affecting root growth and development and seed and fruit yield. On the other hand, regarding to its high and indefinite shoot development, planting density is highly important to get the highest yield. An experiment was conducted to study planting density and phosphate in a faeturial experiment level. Three stand density as 10000, 13000, 16000 per ha and four pure phosphate as 0, 50, 100, 150 kg/ha-1 were based on RBCD with three replications, in Feyz-Abad research station, Qazvin in 2004. Results showed 10000 density had significant effectiveness on node number, shoot length, leaf number, leaf dry weight and lateral shoot number. Phosphate also affected significantly the highest leaf dry weight which was achieved by using 150-kg/ha-1 phosphate. The highest node number has been produced by 100 kg/ha-1 phosphate. 10000 plant/ha caused the highest fruit yield, seed number and seed dry weight. Also, 100 kg/ha-1 phosphate treatment leaded to the most seed number and the highest seed dry weight. Plant population and phosphate fertilizer had no significant difference on the oil content.
