List of Articles Dehydration Stress

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - The Effect of Water Deficit on Growth and Some Physiological Responses of Yew (Taxus baccata L.), as an Ornamental Tree
  Farnoosh  Shahmohammadi Marzieh Ghanbari Jahromi Mohsen  Farhadpour Sepida Kalate Jari Ali Mohammadi Torkashvand
  Drought is the most important environmental stress, which is usually defined as an external factor that has adverse effects in plants. The endangered yew species is very important for human societies for medicinal and ornamental reasons. The roots and leaves of this pla More

  Drought is the most important environmental stress, which is usually defined as an external factor that has adverse effects in plants. The endangered yew species is very important for human societies for medicinal and ornamental reasons. The roots and leaves of this plant produce biochemical compounds such as flavonoids, alkaloids and tannins that act as anti-inflammatory, anti-cancer, anti-bacterial and anti-viral. The present research investigated the effect of different levels of drought stress (100, 75, 50 and 25% of field capacity) on the growth and biochemical characteristics of the yew plant in a greenhouse environment in three replications in the form of a completely randomized design. In this research, which used 3-year-old seedlings, the fresh-to-dry weight ratio of shoots and roots, chlorophyll a and b and the ratio of these two, the relative content of leaf water, the activity of superoxide dismutase and catalase enzymes, and the percentage and yield of essential oil were evaluated. The results showed that the growth traits and photosynthetic pigments and the relative water content of the leaves decreased with the increase in the severity of drought stress. Of course, the activity of catalase and superoxide dismutase enzymes increased with the intensity of drought stress. The highest percentage of essential oil was obtained in semi-severe drought stress conditions (50% F.C). With the increase of drought stress up to 25% F.C, the percentage of essential oil decreased. Most of the growth and physiology parameters of yew plant at 75% FC compared to 100% FC were not significantly different, so it seems that this plant shows good tolerance in the condition of 75% FC and has an acceptable yield. Therefore, it is recommended to cultivate this valuable plant in favorable environmental conditions with sufficient water and/or with only in mild stress conditions. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - Investigating the amount of fodder yield and nutrient content of Maxima hybrid corn under the application of biological and chemical nitrogen fertilizers under the conditions of irrigation restriction in Arak
  علیرضا Dadiyan
  In order to investigate the use of biological and chemical nitrogen fertilizers in the conditions of limited water resources, a research was conducted in Arak during the crop years of 2015 and 2016 on the content of nutrients stored in the dry fodder of Maxima hybrid co More

  In order to investigate the use of biological and chemical nitrogen fertilizers in the conditions of limited water resources, a research was conducted in Arak during the crop years of 2015 and 2016 on the content of nutrients stored in the dry fodder of Maxima hybrid corn. This experiment was done in the form of a split-split plot and in the form of a basic design of randomized complete blocks in four replications in such a way that the irrigation levels were placed in the main plot and the nitroxin and nitrogen levels were placed in the sub-plots. The investigated treatments were: irrigation at two common irrigation levels and applying water restriction, nitroxin at three control treatment levels, consumption of 0.5 and one liter of nitroxin per 30 kg of seeds consumed and nitrogen at three control levels, consumption of 125 and 250 Kilogram of nitrogen per hectare which was provided through 46% urea fertilizer. The results of the research showed that the effect of the year on the amount of nitrogen, protein and raw ash of fodder was significant, and in the second year of the test, the aforementioned traits increased. The effect of irrigation on dry fodder yield, the amount of phosphorus and raw ash of fodder was significant, and the aforementioned traits increased under optimal irrigation conditions. Nitroxine treatment also showed a significant effect on experimental traits and with increasing the amount of nitroxine consumption, experimental traits increased in most cases. The mutual effect of irrigation and nitroxine on all the measured traits was significant, and with the application of one liter of nitroxine under normal irrigation conditions, the highest amount of these traits was obtained. In the conditions of applying irrigation restrictions, the use of 1 liter of nitroxin compared to the use of 0.5 liters and also the treatment without the use of nitroxin showed an increase in traits. The interaction effect of irrigation and nitrogen was significant on all studied traits except for dry fodder yield, so that the highest amount of the aforementioned traits was obtained from the consumption of 250 kg of nitrogen under normal irrigation conditions. The mutual effect of nitroxine and nitrogen on the experimental traits was significant, so that their highest average was obtained by consuming one liter of nitroxine together with 125 kg of nitrogen. The interaction effect of all three treatments on all desired traits was significant, so that the highest amount of experimental traits was obtained under the conditions of consumption of one liter of nitroxine combined with 125 kg of nitrogen under optimal irrigation conditions. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  3 - The effect of integrated management of chemical and biological nitrogen sources on some agricultural traits and yield of Maxima hybrid fodder corn under irrigation restriction conditions in Arak
  A.R Dadiyan
  This research was conducted with the aim of investigating the combined use of biological and chemical nitrogen sources under the conditions of limited water resources on some agricultural traits and the yield of fodder in the crop years of 2016 and 2017 in Arak. This ex More

  This research was conducted with the aim of investigating the combined use of biological and chemical nitrogen sources under the conditions of limited water resources on some agricultural traits and the yield of fodder in the crop years of 2016 and 2017 in Arak. This experiment was done in the form of a      split-split plot and in the form of a basic design of randomized complete blocks in four replications, so that irrigation levels were placed in the main plot and nitroxin and nitrogen levels were placed in the sub-plots. The investigated factors were irrigation at two levels of regular irrigation and water restriction, nitroxin at three levels of the control treatment, consumption of 0.5 and one liter of nitroxin per 30 kg of seeds consumed and nitrogen at three levels including the control treatment, consumption of 125 and 250 kg of nitrogen per hectare through 46% urea fertilizer. The interaction effect of irrigation and nitroxine on all the measured traits except the number of rows in the cob and the number of seeds in the cob was significant, and with the application of one liter of nitroxine under normal irrigation conditions, the highest amount of these traits was obtained. In the conditions of applying irrigation restrictions, the consumption of 1 liter of nitroxin compared to the application of 0.5 liters and also the treatment without the use of nitroxin resulted in a slight increase in all investigated traits. The interaction effect of irrigation and nitrogen was significant on all studied traits except the number of cobs in the plant and the total number of seeds in the plant, so that the highest amount of effective traits was obtained from the consumption of 250 kg of nitrogen under normal irrigation conditions. The interaction effect of nitroxin and nitrogen on other traits was significant. The highest number of cobs per plant and higher fodder yield (with an average of 86.42 tons per hectare) were obtained as a result of the consumption of one liter of nitroxin combined with 250 kg of nitrogen per hectare, but regarding other traits, the highest average results were obtained from the consumption of one liter of nitroxin. along with 125 kg of nitrogen per hectare. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  4 - The effect of methanol and salicylic acid foliar application on the physiological and antioxidant properties of rapeseed (Brassica napus L.) under low irrigation conditions
  Samaneh Safajo Ali Faramarzi Jalil Ajali Mehrdad Abdi Mehdi Oraei
  10.22034/aej.2021.708292
  In order to investigate the effect of methanol and salicylic acid foliar application on the activity of antioxidant enzymes (catalase, guaiacol peroxidase and ascorbate peroxidase), soluble carbohydrates and proline content of rapeseed (Brassica napus L) in dehydration More

  In order to investigate the effect of methanol and salicylic acid foliar application on the activity of antioxidant enzymes (catalase, guaiacol peroxidase and ascorbate peroxidase), soluble carbohydrates and proline content of rapeseed (Brassica napus L) in dehydration stress condition, an split-factorial experiment was conducted based on randomized complete block design with three replications in two years (2017 and 2018) in Safiabad Agricultural Research and Training Center of Dezful. The treatments of dehydration stress included three levels (70, 140 and 210 mm evaporation) as main plots and combination of treatments of salicylic acid on three level (control, 100 and 20 μmol) and methanol foliar application on three levels (control, 10 and 20 % Volume) as subplots. The results of analysis of variance showed that the effect of dehydration stress on the activity of catalase, guaiacol peroxidase and ascorbate peroxidase enzymes as well as soluble carbohydrates and proline content was significant. Further more, foliar application of methanol and salicylic acid on measured traits was significant Mean comparison showed that dehydration stress has led to increase activity of antioxidant enzymes as well as soluble carbohydrates and proline content. Finally, foliar application of methanol and salicylic acid has reduced the activity of antioxidant enzymes and increased the content of soluble carbohydrates and proline in rapeseed.  Manuscript profile