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Articles by Reza Heidari
Total Records ( 10 ) for Reza Heidari
  Mohammad Abyari , Reza Heidari and Rashid Jamei
  Neutral solution of isolated anthocyanins are unstable and quickly decolourized by reactions. Thus anthocyanins in living cells may have mechanisms for resistance to maintain colour stability. Copigmentation is the main colour-stabilizing mechanism. In this study copigmentation of Siahe Sardasht grape anthocyanin were investigated with five copigment, tannic acid, coumaric acid, ferulic acid, benzoic acid and caffeic acid. In this research, the dependence of the copigmenation process on the pH, copigment concentration and temperature were established. Also the effects of uv irradiation on colour stability and inhibiting effects of copigmentation against degradation influence of UV irradiation on anthocyanin were evaluated. Copigmentation of anthocyanin resulting in increase in both hyperchromic effects and bathochromic shifts. In this study tannic acid has the biggest hyperchromic effect and benzoic acid has the lowest hyperchromic effect. Four levels of copigment concentration as: 1:0, 1:20, 1:40, 1:60 were examined. The copigmentation effect increased with copigment containe. UV irradiation has the biggest effect on the copigmentation complex in comparison with heating. The suitable pH for copigmentation complex was in pH 3.5. In this study, tannic acid predominate copigment among copigments.
  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
  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.
  Fatemeh Nejad Habibvash , Mohammad Ali Rajamand , Reza Heidari , Siavash Hosseini Sarghein and Mahnaz Heidari Ricani
  Present survey was performed on nine species of Salvia (Lamiaceae) growing wild in different regions of West Azarbaijan in Iran (S. limbata, S. vertisillata, S. macrochlamys, S. nemorosa, S. ceratophylla, S. candidissima, S. syriaca, S. multicaulis, S. sclarea). In this research, three of the most important biochemical characters such as total protein content, total oil content and fatty acids combination in seeds of these species were considered. Analysis of species average comparison variance conducted with ANOVA and Duncan’s test (p<0.05) revealed that there is a significant difference about protein content, oil content and fatty acid composition among species.
  Nayer Mohammadkhani and Reza Heidari
  Response of antioxidative defense system to drought stress was studied in two cultivars of maize differing in sensitivity to drought. The six-days old seedlings were transferred in to different concentrations of polyethyleneglycol (PEG) 6000 as drought stress treatment. After 24 h treatment with PEG 6000 an increase was observed in protective enzymes, MDA content and electrolyte leakage. Under drought stress the activities of protective enzymes in roots and shoots increased sharply. This increase in 704 variety was higher than 301 variety. The protective enzyme activities in roots were lower than those in shoots. The content of malondialdehyde (MDA) increased according to severity of water stress. The content of MDA in roots was lower than in shoots. The electrolyte leakage increased greatly in drought stress, too. Increase of MDA content and electrolyte leakage in 704 variety were higher than 301 variety.
  Nayer Mohammadkhani and Reza Heidari
  Water stress is one of the most important environmental factors that reduce growth, development and production of plants. Stress was applied with polyethyleneglycol (PEG) 6000 and water potentials were: zero (control), -0.15 (PEG 10%), -0.49 (PEG 20%), -1.03 (PEG 30%) and -1.76 (PEG 40%) MPa. The roots and leaves respiration of two maize (Zea mays L.) cultivars -704 and 301- were determined in various concentrations of PEG 6000. Oxygen uptake declined in leaves and roots with increasing PEG concentrations. Decrease of oxygen uptake in roots and leaves of 704 variety were higher than 301 variety. Chlorophyll a, b and total chlorophyll content were significantly decreased (p<0.05), but carotenoids content increased (p<0.05) under water stress. Decrease of chlorophyll content in 704 var. was higher than 301 var., but carotenoids content in 301 var. was higher than 704 var. Relative Water Content (RWC) was used to indicate the degree of stress. RWC decreased with increasing PEG concentrations. Lowering of RWC reduced growth and increased shoot/root ratio. Decrease of water content in 704 plants was higher than 301 plants. Shoot/root ratio in 704 var. was higher than 301 var.
  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.
  Nayer Mohammadkhani and Reza Heidari
  The objective of this research was to evaluate the effect of water stress on stomatal closure of 2 maize cultivars. Water stress was generated by additions of Polyetylene glycol 6000 to the root medium. Water potentials were: zero (control), - 0.15 (PEG 10%), - 0.49 (PEG 20%), -1.03 (PEG 30%) and -1.76 (PEG 40%) MPa. After 24 h treatment, the leaves stomatal of 2 maize (Zea mays L.) cultivars -704 and 301- were photographed in various concentrations of PEG 6000. Stomatal closure was particularly apparent at low water potentials. In low water stress, stomata were open and in moderate water stress, leaves started to close their stomata. Maize leaves closed their stomata after 24 h PEG treatments and stomatal closure in 704 var. was higher than 301 var. Therefore, the stomata of 704 var. were sensitive to water stress than 301 var.
  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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