فهرس المقالات Freezing tolerance

• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  1 - Evaluation of Freezing Damage in some Pistachio Seedling Rootstocks
  Maryam Afrousheh Hossein Hokmabadi Hasan Arab Ali Tajabadipour
  10.22034/jon.2018.540868
  A greenhouse experiment was conducted to evaluate the freezing damage in some pistachio rootstocks by ion leakage and pH changes of leaked solution. A factorial experiment was carried out in randomized block designs (RBD) with three factors: Temperature (A) including 4 أکثر

  A greenhouse experiment was conducted to evaluate the freezing damage in some pistachio rootstocks by ion leakage and pH changes of leaked solution. A factorial experiment was carried out in randomized block designs (RBD) with three factors: Temperature (A) including 4 ̊C, 0 ̊C, -2 ̊C, -4 ̊C, -6 ̊C, Time (B) including 3, 12, 24h , and Rootstock (C) including P. vera cv 'Badami Zarand' (V13) and 'Sarakhs' (S5), P. mutica (M1)and P. atlantica (A7). For this, one-year-old seedlings were kept at these five temperatures in incubator for 2 hours. Then in the first 24 hours in three hour intervals and during four days, EC and pH in leaked solution were measured daily. After four days the seedling samples were autoclaved at temperatures 105°C for 4 minutes to destroy all cell membrane. EC and pH of remaining solution were measured again and the percentage of ionic leakage was calculated. The results showed that the best time to evaluate the pH and ionic leakage was 24 hours after incubation of samples. Based on the results, ionic leakage dramatically increased with decreasing temperatures from 0°C to -6°C, while pH of leaked solution had no significant difference in 0°C and 4°C temperature treatments. When temperature reduced from 0°C to -6°C, like ionic leakage, pH greatly reduced. So the pH of the leaked solution could be an appropriate tool to study the freezing damage of pistachio rootstocks. Based on the results of pH and ionic leakage, P. mutica and P. atlantica were the most frost tolerant and sensitive rootstocks of this experiment, respectively. تفاصيل المقالة
• حرية الوصول المقاله
  • صفحة الملخص
  • نص كامل
  
  2 - Study the Freezing Resistance of some Barley Varieties Using Rates of Electrolyte Leakage
  Shahram Ashrafi Rad Seyyed Mohammad Taghavi
  10.22034/jchr.2021.577905.0
  In order to study the freezing resistance of some barley varieties using rates of electrolyte leakage this experiment was carried out on three barley variety, including Reyhan, kavir, and Nosrat. These varieties are the most important varieties that cultivated in Semnan أکثر

  In order to study the freezing resistance of some barley varieties using rates of electrolyte leakage this experiment was carried out on three barley variety, including Reyhan, kavir, and Nosrat. These varieties are the most important varieties that cultivated in Semnan province. For this experiment, barely seeds were sown in small containers. The current experiment was carried out as Factorial experimental design plan based on completely randomized design (CRD).The first factor in this study was barley variety in three levels. The second factor was temperature in 5 levels including +4°C, -4°C, -8°C, -12°C and -15°C. Seedlings in the stage of tillering, was sprayed by water and then were put in the incubator for two hours. Then two gram samples was selected and 20 mm deionized water was added and shakes for 24 hours. Then every day for a week EC in solution was measured. Analysis of variance (ANOVA) was used to determine significant (p < 0.01 and p < 0.05) differences between barley genotypes. The differences between means of barley varieties were inspected using Duncan test . The results showed that the percentage of ion leakage between the three cultivars had significant differences .The effect of temperature on the percentage of ion leakage in all days, had significant difference.The highest percentage of ion leakage measurements on all days was at the -15°C and the lowest percentage of leakage occurred at 4 °c . Kavir variety in comparison with other varieties had lower cold tolerance. Interaction of temperature and genotype factors on ion leakage measurements showed that all varieties had significant differences. تفاصيل المقالة