Abbas Alizade ahmad abadi1; sarah khorasaninejad; Khodayar Hemmati
Abstract
In order to study the effects of Humic acid levels and irrigation regimes on the some morphological and biochemical characteristics of Echinacea purpurea L., a pot experiment was conducted as factorial based on randomized complete block design with three replications and four experimental units at research ...
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In order to study the effects of Humic acid levels and irrigation regimes on the some morphological and biochemical characteristics of Echinacea purpurea L., a pot experiment was conducted as factorial based on randomized complete block design with three replications and four experimental units at research farm of Gorgan University of Agricultural Sciences and Natural Resources, during growing season of 2014- 15. Treatments were four levels of irrigation regimes (40, 60, 80 and 100 percent field capacity) and humic acid including four levels: (0, 250, 500 and 1000 mg/kg). The results showed that irrigation regimes had significant effect on all measured properties except root length. Humic acid increased all of the growth caractristics and morphological traits in 5% level statistically, while had significant effect on total flavonoid and increased it. Interaction effect of humic acid and irrigation regimes was significant for wet and dry weight of root and shoot, total phenol and flavonoid. Therfore, the limited irrigation had negative effect on growth and plants increased their phenol and antioxidant components to stress coping. Humic acid increased growth and yield in plants that were faced with stress.
Vahid Akbarpour; Mahboobeh Ashnavar; Mohammad Ali Bahmanyar
Abstract
Plant secondary materials play an important role in health and human nutrition. According to the importance of coneflower in the production of secondary materials and also the effect of nutrient on the amount of secondary materials, a pot experiment was conducted with a completely randomized design six ...
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Plant secondary materials play an important role in health and human nutrition. According to the importance of coneflower in the production of secondary materials and also the effect of nutrient on the amount of secondary materials, a pot experiment was conducted with a completely randomized design six treatments and three replications in Sari University of Agricultural Sciences and Natural Resources in 2015. Treatments were included: chemical fertilizer (150 kg N, 120 kg P2O5 and 250 kg K2O per hectare from urea, triple super phosphate and potassium sulphate source, respectively) (CF), 30 t.ha-1 manure (M), 15 t.ha-1 M+25 percent CF, 15 t.ha-1 M+50 percent CF and 15 t.ha-1 M+75 percent CF and control (without applying chemical fertilizer and compost). Result indicated that all traits such as chlorophyll a and b, yield of anthocyanin and flavonoid in leaf and root, yield of total phenolic in flower and percentage of antioxidant activity in full bloom were affected by different fertilizer treatments. So that the maximum concentration of chlorophyll a and b (11.33 and 2.41 mg.gr-1 FW respectively) were related to the application of chemical fertilizer that with incorporation manure and chemical fertilizer (15 t.ha-1 M + 25 percent CF and 15 t.ha-1 M+75 percent CF) were statistically the same level. Meanwhile, the application of 30 t.ha-1 M had the greatest effect on anthocyanin and flavonoid in leaves and total phenolic of flower. Maximum antioxidant activity was obtained with using 15 t.ha-1 M+25 percent CF increased 10 percent and 80 percent compared to the control and CF treatments, respectively.
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.