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Articles by Nayer Mohammadkhani
Total Records ( 2 ) for Nayer Mohammadkhani
  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
  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.
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