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Articles by Jirair Carapetian
Total Records ( 7 ) for Jirair Carapetian
  Khoshnoud Alizadeh and Jirair Carapetian
  The main breeding objective in growing field crops under rainfed condition is the selection for high performance lines. Traits that are correlated with grain yield may be useful for indirect selection. Genetic variation and correlations for eight agronomically important characters were studied across 45 selected exotic and indigenous safflower pure lines in the Dryland Agricultural Research Institute during two consecutive growing seasons. There was a considerable variation with regard to all characteristics under study in the spring planting. The observed range for plant height (cm), average number of heads per plant, days to flowering, average number of seeds per head, 100 seed weight (g), grain yield (kg ha-1), oil percent and the ratio of kernel to hull were, 61-86, 5-16, 116-134, 10-66, 3.1-5.2, 211-1117, 21.4-31.7 and 0.74-1.44, respectively. Correlation studies indicated that only the average number of seeds per head has a significant positive relationship with grain yield. However, there was a negative significant correlation between grain yield and days to flowering. Genetic gains may be achieved in the future by augmenting number of seeds per head, while increasing earliness of safflower in cold drylands of Iran should also have a beneficial effect on grain yield.
  Leila Zeinali Yadegari , Reza Heidari and Jirair Carapetian
  In this study plant`s response to cold acclimation and nonacclimation was investigated in soybean (Glycine max). Seedlings were exposed to 15°C (cold-acclimated) or 25°C (nonacclimated) for 24 h, under 250 μmol m-2 sec-1 Photosyntetically Active Radiation (PAR). Then, all plants were exposed to chilling temperature at 4°C for 24 h and allowed to recover at 25°C for 24 h. Physiological responses to chilling, including, MDA, proline, chlorophyll a and b and carotenoids and total protein contents were measured in soybean to identify mechanisms of chilling tolerance. Relative water content showed that cold-acclimated plants were less affected by chilling compared to nonacclimated plants. Cold-acclimated plants also recovered faster from chilling injury than nonacclimated plants.
  Leila Zeinali Yadegari , Reza Heidari and Jirair Carapetian
  Physiological responses to chilling, including antioxidative enzyme activity, Relative Water Content (RWC) and soluble sugar contents were investigated in soybean to identify mechanisms of chilling tolerance. Plants were exposed to 15°C (cold-acclimated) or 25°C (non-acclimated) for 24 h, under 250 μmol m-2 sec-1 Photosynthetically Active Radiations (PAR). Then all plants were exposed to 4°C (chilling temperature) for 24 h and allowed to recover at 25°C for 24 h. We analyzed the activity of ascorbate peroxidase (APX), catalase (CAT) and guaiacol peroxidase (GPX) and soluble sugar content and RWC in both shoots and roots of soybean seedlings. It revealed that the activity of APX and CAT and GPX induced in leaves and roots. Increased activity in roots is important for cold tolerance as compared to shoots. The amount of RWC decreased in both roots and shoots, but soluble sugar content increased, especially in shoots as compared to control plants. Chilling sensitive soybean plants can be made tolerant to cold by cold-acclimation.
  Leila Zeinali Yadegari , Reza Heidari and Jirair Carapetian
  Low temperature damage is a common problem for early-planted soybean, because it is a tropical plant and is sensitive to low temperatures Soybean (Glycine max cv. Williams) is a tropical crop, but is also grown in temperate regions in middle spring to late summer. This crop has an important role in human diet. Cold temperature damage is a common problem for this plant in temperate regions. Physiological responses to chilling, including, Malondialdehyde (MDA), total protein, Relative Water Content (RWC) and soluble sugar contents were investigated in soybean to identify mechanisms of chilling tolerance. Seedlings were exposed to 15C (cold-acclimated) or 25C (nonacclimated) for 24 h, under 250 mol/m2/sec Photosyntetically Active Radiation (PAR). Then, all plants were exposed to chilling temperature at 4C for 24 h and allowed to recover at 25C for 24 h. Relative water content, MDA and total protein contents showed that cold-acclimated plants were less affected by chilling compared to nonacclimated plants. Cold-acclimated plants also recovered faster from chilling injury than nonacclimated plants.
  Leila Zeinali Yadeghari , Reza Heidari and Jirair Carapetian
  Low temperature damage is a common problem for early-planted soybean, because it is a tropical plant and is sensitive to low temperatures. In this research plant`s response to cold acclimation and nonacclimation was investigated in soybean (Glycine max). Seedlings were exposed to 15C (cold-acclimated) or 25C (nonacclimated) for 24 h, under 250 mol m 2 s 1 Photosyntetically Active Radiation (PAR). Then, all plants were exposed to chilling temperature at 4C for 24 h and allowed to recover at 25C for 24 h. Physiological responses to chilling, including, MDA, proline, chlorophyll a and b and carotenoids and total protein contents were measured in soybean to identify mechanisms of chilling tolerance. Relative water content showed that cold-acclimated plants were less affected by chilling compared to nonacclimated plants. Cold-acclimated plants also recovered faster from chilling injury than nonacclimated plants.
  Leila Zeinali Yadegari , Reza Heidari and Jirair Carapetian
  When plants with tropical and subtropical origins, like soybean, expose to low temperatures, suffer some injuries that some times are lethal for them. Cold temperature damage is a common problem for soybean in temperate regions. So it can be a good strategy that exposes these plants to low temperatures slightly above freezing temperature, to increase their chilling tolerance. Physiological responses to chilling, including antioxidative enzyme activity, respiration, membrane permeability were investigated in soybean to identify mechanisms of chilling tolerance. Plants were exposed to 15C (cold-acclimated) or 25C (nonacclimated) for 24 h, under 250 mol m-2s-1 Photosynthetically Active Radiations (PAR). Then all plants were exposed to 4C (chilling temperature) for 24 h and allowed to recover at 25C for 24h. We analyzed the activity of Ascorbate Peroxidase (APX) and Guaiacol Peroxidase (GPX) in leaves. It revealed that the activity of APX and GPX induced in leaves. The respiration and membrane permeability of nonacclimated leaves were higher than the cold acclimated ones in chilling stress.
  Narges Kafizadeh , Jirair Carapetian and Khosrow Manouchehri Kalantari
  The effects of heat on pollen grains was studied in pepper (Capsicum annuum L.) under greenhouse conditions using a completely randomized design. Seeds of the California Wander variety were grown in a growth chamber and flowers plucked and placed in 38C (treatment) and 25C (check) for a period of 8 h and consequently pollen viability, pollen tube growth and the growth of pollen tube inside the style was studied. Results indicate that pollen viability and pollen tube growth was considerably reduced at 38C as compared with the check. In addition, pollen tube growth inside the style at 38C was twisted and they grew in spiral and helical forms.
 
 
 
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