Growing vegetables
D. Akhgar; H.R. Karimi; S.R. Sahhafi; S.H. Mirdehghan
Abstract
Introduction
Drought stress in tomatoes reduces fruit quality and yield, also fall leaves and cause of blossom rot. It has been reported that drought stress reduces cell division and causes the stomata to close, followed by a decrease in the flow of carbon dioxide to the mesophyll cells of the leaf. ...
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Introduction
Drought stress in tomatoes reduces fruit quality and yield, also fall leaves and cause of blossom rot. It has been reported that drought stress reduces cell division and causes the stomata to close, followed by a decrease in the flow of carbon dioxide to the mesophyll cells of the leaf. Several methods have been proposed to overcome the drought stress in tomato plants, which can be mentioned the use of drought tolerance genotypes, genetic engineering to identify drought resistant genes and transfer them to sensitive plants, as well as the use of tolerancet rootstocks. It has reported that type of rootstock can effected on tolerance of tomato plants to drought stress. For this reason, the present study was conducted to investigate the effect of wild eggplant rootstock on the drought tolerance of two tomato cultivars.
Material and Methods
In order to find the effect of the wild eggplant rootstock on the tolerance of two tomato cultivars, a factorial experiment was conducted as completely randomized design with two factors. Factors were included irrigation period three levels of 3 (control), 6 and 9-day and grafting combination at 6 levels involved non-grafted Dafnis, non-grafted Isabella, self-grafted Dafnis, self grafting Isabella, Isabella grafted on wild eggplant rootstock (S. torvum), and Dafnis grafted on wild eggplant rootstock. The plants were exposed to drought for 54 days. At the end of experiment growth and physiological parmeters including leaf specific, plant height dry weight of shoot as well as photosynthesis parameters, RWC and plant nutrients were measured. The amount of leaf proline was measured according to Paquin and Lichasur methodusing a spectrophotometer at a wavelength of 515 nm. The phenolic compounds of the leaves were measured at a wavelength of 725 nm using a spectrophotometer (Isfendiyaroglu and Zeker, 2002). Also, the membrane stability index (ion leakage percentage) was measured according to Lutts et al.'s method (Lutts et al., 1996).
Results and Discussion
The results showed that with increasing irrigation period decreased the most of vegetative parameters, photosynthesis pigments, and mineral nutrients, so that, the highest value was showed at the 3-day irrigation period and the lowest value was at the 9-day irrigation period. Shoot weight decrese is probably due to morphological changes in plant roots, which is a plant response to drought stress. The results also showed that the interaction of irrigation period and grafted combination on some vegetative and ecophysiological parameters was significant. The lowest dry weight of shoot was observed at 9-day of irrigation period in plants of Dafnis grafted on torvum rootstock., Tthe highest dry weight root volume, leaf potassium and phosphorous concentration were at the 3-day irrigation period in self-grafted Dafnis plants.The results also showed that the amount of phenolic compounds in plants of Isabella grafted on torvum rootstock was the highest in 9 days irrigation period which may be due to the rootstock effect on the synthesis of these compounds in the scion. According to the results, the concentration of leaf magnesium in non-grafted plants increased with the increase of the irrigation cycle from 3 days to 9 days, althougth no significant difference was observed between self-grafted and non-grafted plants. In the 9-day irrigation period, the highest concentration of leaf magnesium was observed to non-grafted Daphnis plants, which was significantly different from other grafting combinations compounds except Daphnis self-grafted plants.
Conclusion
The results of the present study showed that drought stress had the greatest effect on dry matter, and the amount of photosynthetic indices and pigments in tomato plants. Based on the results of the present study, it was found that the most of the reduce vegetative and physiological parameters was observed in Daphnis cultivar grafted on the thorum rootstock, were significantly reduced compared to self-grafted or non-grafted plants, which it was due to the dwarfing effects of this rootstock or grafting incompatibility. According to the results of the present study, it can be postulated that in drought stress Isabella cultivars grafted on the wild eggplant rootstock had more growh than other combination grafting. Hence it proposed more studies in this case.
L. Poorshahabadi; H. Mirdehghan; H.R. Roosta
Abstract
Introduction: Consumer’s demand for high valuable bioactive compounds have been increased in recent years. Microgreen is a stage in the growth of vegetables that is popular among consumers for their high nutritional value. It can consider as young and tender edible seedling to enhance salad quality ...
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Introduction: Consumer’s demand for high valuable bioactive compounds have been increased in recent years. Microgreen is a stage in the growth of vegetables that is popular among consumers for their high nutritional value. It can consider as young and tender edible seedling to enhance salad quality and safety. At the same time, it has been reported that microgreen can provide higher amount of phytonutrient (ascorbic acid, phenolics and carotenoids) and minerals. Hydroponics is defined as a system of growing plant in nutrient solution which could provide necessary micro- and macro-elements for early seedling growth. The use of hydroponic gardening by commercial growers is steadily increasing as the ability to control the growing factors while conserving space is of paramount importance to crop yields and commercial profits. It is also worth noting that hydroponic systems are good for the environment. As the water is recirculating, it is not being evaporated as readily or absorbed into the ground quickly. Therefore, it is important and valuable to study the growth of some common vegetable in hydroponics as microgreen in terms of higher bioactive compounds and minerals.
Material and Methods: The present study was conducted to evaluate two production systems (hydroponic and soil system) and also two growth stages (microgreen and mature) of 6 vegetable species (green basil, violet basil, lettuce, radish, dill and coriander). Different growth characteristics and bioactive compounds were measured as indices of yield and quality include: root dry/fresh weight, shoot dry/fresh weight, leaf area, ascorbic acid, total chlorophyll, carotenoids, phenolics, antioxidant activity and micro- and macro-nutrients in a factorial experiment based on completely randomized design with three replications. The weight of roots and shoots were measured at two stages during growth. Leaf area of vegetables were determined using a leaf area meter (CI-202, USA). Ascorbic acid determination was performed by 2, 6-dichlorophenolindophenol reagent. Chlorophyll, carotenoids, phenolics and antioxidant activity were tested spectrophotometric analysis. Samples of dry leaves were ground and dry-ashing at 550 °C for 4 h. The ashes were dissolved with 5 ml 2 N HCl and made up to 50 ml with distillated water. The concentrations of K were measured by flame photometry (Jenway, model PFP7). Analysis of Ca and P was carried out by titration and spectrophotometry (model T80 UV/VIS) , respectively. The Mg, Fe, Zn and Cu were identified by atomic absorption procedure.
Result and Discussion: The results showed that growth characteristics of violet basil, green basil, lettuce, radish, dill and coriander were higher at the adult stage than microgreen stage. The results also showed that the growth characteristics of green basil, lettuce, radish, dill and coriander were higher in hydroponics than soil cultivation. Total chlorophyll content of violet basil, green basil, lettuce and dill were higher at microgreen stage than adult stage, while total chlorophyll content of leaf radish and dill plants were higher at the adult stage than microgreen stage. However, the chlorophyll content of the whole plants was higher in the conditions of soil cultivation than hydroponic conditions. Phenolic compounds and antioxidant activity of lettuce, radish and coriander leaves were higher at microgreen stage than adult stage, while these traits were higher in adult stage than in microgreens in violet basil, green basil and dill. Vitamin C was also higher in all vegetables in the microgreen stage compared to the mature stage in both cultures except for dill and coriander. Mineral elements content was higher at microgreen stage than in the mature stage, except for zinc element.
Conclusion: Based on the results of this experiment, it can be concluded that the production and cultivation of these six vegetables in the microgreen stage could be considered as a suitable method for high nutritional value.
Z. Ahmadi; hossein mirdehghan; Hossein Hokmabadi; Mohammad Hosein Shamshiri
Abstract
Fresh pistachio nuts undergo biochemical and physiological changes after harvest and postharvest and as a result, it has a short shelf life. The purpose of this research is to study the effects of packaging type and edible coating on quality and increasing the shelf life of fresh pistachio nut. Therefore, ...
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Fresh pistachio nuts undergo biochemical and physiological changes after harvest and postharvest and as a result, it has a short shelf life. The purpose of this research is to study the effects of packaging type and edible coating on quality and increasing the shelf life of fresh pistachio nut. Therefore, two separate experiment were conducted and in first one the individual fresh pistachio were dipped in different concentration of aloe vera gel (0 (control), 25, 33, 50 %) and also Nanocid at 80 and 100 mgl-1 and kept at 4±2°C for 40 days. In second experiment, to compare the plastics produced through Nano technology and usual plastics (nylon), fresh pistachio nut were packed and stored in mentioned condition. Weight loss, pistachio quality appearance and its marketability were examined every 5 day- interval and fat and soluble carbohydrate at the end of storage. The results showed that Nano films comparing to control were useful significantly (p≤0.01) in controlling the weight loss and keeping fresh pistachio’s appearance. Also weight loss and fresh pistachio browning were lower in aloe vera gel treatments and the best results (higher soluble carbohydrate and appearance) come from 25% aloe gel compared to control.
M. Hashemi; hossein mirdehghan; H. Farahmand; H. Dashti
Abstract
Gerbera (Gerbereajamesonii) cut flower has magnificent economical value in international cut flower industry. Due to sensitivityto ethylene and to gray mold, it has a short postharvest life. In this research, the effects of pulsing treatments with Salicylic Acid (100 and 200 mg/L) and Methyl jasmonate ...
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Gerbera (Gerbereajamesonii) cut flower has magnificent economical value in international cut flower industry. Due to sensitivityto ethylene and to gray mold, it has a short postharvest life. In this research, the effects of pulsing treatments with Salicylic Acid (100 and 200 mg/L) and Methyl jasmonate (25 and 50 mg/L) for 24h on quality and vase-life of gerbera cut flower were assessed. Distilled water + Sucrose (4%) was applied as control treatment. Afther treatment application, the flowers were taken out and kept in distilled water + sucrose (4%) solution at 25±2.C˚The highest vase-life was obtained in salicylic acid 200 mg/L (9.91 day) followed by methyl jasmonate 25 mg/L (9.66 day), compared to control (7.49 day). Among the treatments, salicylic acid (200 mg/L) decreased flower petal wilting, preservative pH, and microorganism growth and subsequently increased the absorption of preservative solution, soluble solids, cut flower stem diameter and vase-life,therefore it can be choose as best treatment in this experiment.
H. Khatib; hossein mirdehghan; N. Doraki
Abstract
Abstract
In this study, fresh pistachio of 'Ohadi' and 'Akbari' cultivars expose to the UV-C radiation with a wavelength of 0, 3, 6 and 12 KJ/m2, then located at temperature of 1 ± 3 degrees Celsius for 45 days. Properties or attributes, including weight loss, stiffness and sensory evaluation of fresh ...
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Abstract
In this study, fresh pistachio of 'Ohadi' and 'Akbari' cultivars expose to the UV-C radiation with a wavelength of 0, 3, 6 and 12 KJ/m2, then located at temperature of 1 ± 3 degrees Celsius for 45 days. Properties or attributes, including weight loss, stiffness and sensory evaluation of fresh pistachio after 20 and 45 days storage were measured. Results showed that pistachio nut weight losses (28.77%) was less than the amount of weight loss of pistachio clusters (33.39%). UV-C 6 kj/m2 treatment showed lowest weight loss than other treatments (p
