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Articles by Ali Akbar Ehsanpour
Total Records ( 2 ) for Ali Akbar Ehsanpour
  Ali Akbar Ehsanpour and Roya Razavizadeh
  Water stress and unfavorable climate decrease the growth and development of plant globally. Medicago is a valuable plant as a source of food for animal, foliage and for medicine. Since, Iran is located in a dry area; consequently, the study of plant responses to water stress is important. In this research UV-C radiation was used to induce physiological and genetic changes in alfalfa callus. In vitro grown calluses of M. sativa were exposed to UV-C for 0, 15, 30 and 60 min and then, were transferred to MS medium containing 0, 2, 5, 10, 20, 30% PEG. All explants were kept in the dark in the culture room. Calluses tolerate to osmotic stress were selected according to fresh weight. Results showed that radiation of UV-C for 60 min increased the osmotic tolerance and decreased the effect of drought stress.
  Fariba Amini and Ali Akbar Ehsanpour
  The effect of NaCl stress on soluble proteins, proline, carbohydrates and Na+/K+ of two tomato (Lycopersicon esculentum Mill.) cultivars Isfahani and Shirazy were studied. Seeds were germinated on medium containing only water agar, then transferred to MS medium supplemented with different concentrations of NaCl (0, 40, 80, 120 and 160 mM) for 21 days. Increasing of salinity resulted in increasing of soluble proteins in stem & leaf of cv. Isfahani but decreasing in cv. Shirazy. Soluble proteins in roots of both cultivars showed some variations. When concentration of NaCl in the medium was increased proline contents of stem-leaf and roots in both cultivars increased significantly. However, cv. Shirazy showed higher amount of proline level. Proline content in stem-leaf in comparing with roots was higher in two cultivars. In response to increasing of salt concentration of the medium, the average amount of total carbohydrate in stem-leaf of cv. Shirazy increased but, in cv. Isfahani level of carbohydrate decreased. When explants form both cultivars were exposed to the higher concentration of salt the level of carbohydrate in roots increased. High-level salinity decreased the reduced sugars in both cv. either in stem-leaf or roots. Salt stress increased Na+ and decreased K+ content in both cultivars significantly.
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