adel abdimani; Gholam Ali Akbari; elias soltani; Majid Ghorbani Javid
Abstract
The present study was conducted during the agricultural year 2021-2022 in plots with three repetitions at the research farm of Aboureihan Campus, located in the Pakdasht region of Tehran province. In this study, the light level was controlled at four levels (no shading, light-shade, shade-light and complete ...
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The present study was conducted during the agricultural year 2021-2022 in plots with three repetitions at the research farm of Aboureihan Campus, located in the Pakdasht region of Tehran province. In this study, the light level was controlled at four levels (no shading, light-shade, shade-light and complete shading). The main factor was the light control at these four levels, and the secondary factor was the planting date at three levels (20th of April, 10th of May, and 31th of May). Applying complete shading initially, and then transitioning to shade-light treatment along with planting ginger on the 20th of April, had the most significant impact on increasing all the examined traits, including yield components, yield, and the percentage of essential oil in ginger rhizomes. The two mentioned treatments (complete shading and shade-light) led to an approximately 29% increase in the number of rhizomes in ginger plants compared to both the full light treatment and the light-shading treatment. On the other hand, the highest ginger essential oil percentage (1.76%) was obtained in plants planted on the 20th of April, which did not show a significant difference compared to plants planted on the 10th of May (1.66%) but was approximately 25% higher when compared to the essential oil percentage of plants planted on the 31th of May.Therefore, the overall results demonstrated that implementing shading treatment on the planting date of 20st of April could be a promising method for significantly increasing both the quantitative and qualitative yield of ginger under similar climatic conditions.
Mansoure Hatamian; Mostafa Arab; Mahmoud Reza Roozban
Abstract
Biosynthesis of plant pigments is affected by environmental factors especially light intensity. An expriment was conducted to evaluate the effect of different light intensities on photosynthetic and non-photosynthetic pigments of two rose cultivars including ‘Red One’ and ‘Gulmira’ ...
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Biosynthesis of plant pigments is affected by environmental factors especially light intensity. An expriment was conducted to evaluate the effect of different light intensities on photosynthetic and non-photosynthetic pigments of two rose cultivars including ‘Red One’ and ‘Gulmira’ under greenhouse conditions. In this experiment, the effects of different light intensities including 240, 520 and 640 mol/m2/s and control with 1200 mol/m2/s (without application of plastic nets) on the rose cultivars was evaluated under greenhouse conditions. Plastic nets were used to obtain different levels of light intensities. The results showed that photosynthetic pigments, chlorophyll and carotenoids, significantly increased in the light intensity of 240 mol/m2/s vs. control. In this light intensity, antocyanin content was significantly reduced. Reducing light intensity to 240 mol/m2/s could result in higher chlorophyll as well as carotenoid content without significant changes in flavonoids. Increasing anthocyanin content with increasing light intensity to 1200 mol/m2/s could be a defense mechanism in plants against toxic levels of light intensities.