Mona Arvand; Yousef Sohrabi
Abstract
In order to investigate the effects of integrated management of chemical and biological fertilizers on physiological traits, and grain yield of black cumin (Nigella sativa L.) under different irrigation levels, a split-plot experiment has been conducted based on a randomized complete block design ...
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In order to investigate the effects of integrated management of chemical and biological fertilizers on physiological traits, and grain yield of black cumin (Nigella sativa L.) under different irrigation levels, a split-plot experiment has been conducted based on a randomized complete block design with four replications at research farm University of Kurdistan in the spring of 2016. Two irrigation levels (irrigation at 100% and 70% of the plant water requirement) are randomized on the main plot. Five fertilizer levels (including 100% chemical fertilizers, 80% chemical fertilizers + biofertilizers, 60% chemical fertilizers + biofertilizers, 40% chemical fertilizers + biofertilizers, and non-fertilizer application) are randomized on a sub-plot. The results reveal that under irrigation at 70% of the plant water requirement conditions, proline concentration, soluble carbohydrates concentration, and lipid peroxidation have increased, while the values of other studied physiological parameters as well the grain yield have dropped. The combination of biological and chemical fertilizers positively affect the studied physiological traits and grain yield, such that the highest grain yield belongs to the combined treatment of 60% chemical fertilizers + biofertilizers (798.18 kg ha-1), showing an increase of 37.22% compared to the control (without fertilizer). Due to the positive effects of combining bio-chemical fertilizers on physiological parameters and grain yield, it is recommended to replace the combination of bio-chemical fertilizers instead of employing only chemical fertilizers.
Mahdi Sadeghi Raviz; Nourollah Ahmadi; Naser Safaie; Iman Rahmani
Abstract
The effect of methyl jasmonate (MeJA) vapor treatment on antioxidant enzymes activities and vase life of gerbera cut flower was investigated in this experiment. This research was conducted as a split-plot experiment based on completely randomized design with three replications at the laboratory of the ...
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The effect of methyl jasmonate (MeJA) vapor treatment on antioxidant enzymes activities and vase life of gerbera cut flower was investigated in this experiment. This research was conducted as a split-plot experiment based on completely randomized design with three replications at the laboratory of the postharvest physiology, College of Agriculture, Tarbiat Modares University in 2013. Gerbera flowers were harvested at early morning from a commercial greenhouse and cut flower stems were put in a preservative solution containing 200 mg/L 8- hydroxyquinoline sulfate and sucrose 3%, exposed to 0, 0.1, 0.2 and 0.3 µlL−1 MeJA with 20 µlL−1 ethanol and control for 24 h. The results showed that MeJA significantly increased vase life and improved postharvest characteristics of cut gerbera flowers. MeJA 0.2 µlL−1 treatment extended the vase life to 15.67 days, compared to the control and ethanol treatments. Minimum of petal wilting symptoms were revealed in samples treated with MeJA. The lowest malondialdehyde and lipid peroxidation rates were also observed in MeJA treatments that they had a significant difference with ethanol and control. MeJA treatments resulted in increasing antioxidant enzymes activity and protein content compared with ethanol or control.
Forough Saydpour; Mohammad Sayyari; Fardin Ghanbari
Abstract
Glycine betaine (GB) is one of the osmotic plant-protecting members that accumulate in response to abiotic stresses. An experiment was, therefore, conducted to test whether GB application at various concentrations (0, 10, 20 and 30 mM) through seed soaking or foliar spray methods would protect cucumber ...
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Glycine betaine (GB) is one of the osmotic plant-protecting members that accumulate in response to abiotic stresses. An experiment was, therefore, conducted to test whether GB application at various concentrations (0, 10, 20 and 30 mM) through seed soaking or foliar spray methods would protect cucumber seedlings, subjected to chilling stress. At two true leave stages, after GB treatment, the seedlings were exposed to chilling six h/day at 3°C for 6 days. Results showed that GB pre-treatment improved growth parameters of seedlings subjected to chilling stress and provided significant protection against chilling stress compared to non-GB-treated seedlings. GB prevented chilling injuries with increasing chlorophyll, proline content and antioxidant activities and decreasing electrolyte leakage, malondialdehyde and hydrogen peroxide content. The highest cold tolerance was obtained with 20 and 30 mM GB application and seed soaking method provided better protection compared to foliar spray method.
Fariborz Habibi; Mohammad Esmaeil Amiri
Abstract
Enzymaticactivity and biochemical responsesof two citrus rootstocks [sour orange (Citrus aurantium L.) and trifoliate orange (Poncirus trifoliata Raf.)] to in vitro salinitystress were studied. Explants of both rootstocks were transferred to Murashige and Skoog (MS) solid proliferation medium containing ...
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Enzymaticactivity and biochemical responsesof two citrus rootstocks [sour orange (Citrus aurantium L.) and trifoliate orange (Poncirus trifoliata Raf.)] to in vitro salinitystress were studied. Explants of both rootstocks were transferred to Murashige and Skoog (MS) solid proliferation medium containing 8.9 µM Benzyladenine (BA) and 0.5 µM Naphthaline Acetic Acid (NAA) supplemented with 0, 50, 100, 150, 200 mM of sodium chloride (NaCl) with six replicates. After six weeks, results showed that, rootstock, salinity levels and their interaction, had a significant effect on all of the measured parameters. Antioxidant enzymes activity such as: catalase, peroxidase, ascorbate peroxidase, proline content, soluble sugars and malondialdehyde (MDA) content increased in both rootstocks by increasing salinity level. The amounts of increasing in sour orange rootstock were greater than trifoliate orange, except for peroxidase enzyme and MDA. Total protein content decreased by increasing salinity level in both rootstocks. Sour orange rootstock has higher total protein content than trifoliate orange. According to the results, sour orange rootstock was more tolerant to salt stress.