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Articles by Leila Zeinali Yadegari
Total Records ( 2 ) for Leila Zeinali Yadegari
  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 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.
 
 
 
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