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Articles by Naser Arabzadeh
Total Records ( 3 ) for Naser Arabzadeh
  Naser Arabzadeh
  Osmotic and elastic parameters of Haloxylon aphyllum branchlets after inducing dryness were studied. The study of changes of water relations parameters with the aim of improving resistance to drought of this species through inducing chronic dryness and clarification of physiologic mechanisms of this plant in response to a low water and dryness are among the objectives of this study. For this purpose, the method of pressure chamber was employed. By this method, the pressure-volume curves were drawn and through their analysis, plant water relations parameters were obtained. A relatively mild dryness was induced to twigs through a lack of irrigation. It was such that after two weeks, the potential of the water of the branchlet of H. aphyllum twigs reached to -16.5 bars. A very intensive dryness was also induced to that but after four weeks of prevention from irrigation; it was such that the potential of the water of H. aphyllum branchlet was diminished to -27.2. A relatively mild dryness was repeated for six terms and a relatively harsh dryness for eleven consecutive periods. In both series of experiment, the potential of water of control twigs were being watered every two days once, remained fixed at about -12.7 bars. Based on the results, though the relatively mild dryness induction to twigs of this type of Haloxylon, made the increase of elastic property of branchlet textures but it had not a meaningful impact on its osmotic potential. Although the application of a relatively intensive dryness reduced the osmotic potential of H. aphyllum branchlets but at the same time, it increased the elasticity of the tissues too.
  Naser Arabzadeh
  Soluble carbohydrates (sugars) are considered as important metabolites in plants under drought stress. In order to study the trend of changes of this osmolyte when encountering with dryness, the seeds of two species of Haloxylon persicum and Haloxylon aphyllum were planted in vase and their grown twigs underwent drought stress after a one year care and a one month compatibility with the greenhouse environment. The study of changes of this osmoiyte in branchlet and roots of the twigs of these two types of haloxylon was planned within the format of a completely randomize design with two treatments of species and fifteen tension treatments (lack of irrigation of twigs). The Two Species of Haloxylon persicum and Haloxylon aphyllum and the levels 0 (control), 2, 4… and 28 days of lack of irrigation were determined as treatments of experiment. The analysis of data in two sides analysis variance was conducted and the averages were compared by using Duncan’s test. The study of data of branchlet and root showed that with the possibility of 99%, the effect of drought stress on the increase of the rate of soluble sugar of branchlet and root of both types of haloxylon was meaningful. In addition, between these two species at the same level of reliability, there was a difference. The study of the effect of drought stress on changes of the quantities of total soluble sugars showed that the changes of this factor are of more similarity with changes of soluble sugar of root and they almost obey the same model. The increase of rate of branchlet soluble sugars, root and total soluble sugars were in proportion with the intensity of tension.
  Naser Arabzadeh and Ramazan Ali Khavari-Nejad
  Superoxide dismutase activity changes were studied at different periodic tensions using of spectrophotometric measurement of decline in NitroBlue Tetrazolium reduction to Blue Formazan at 560 nm in Haloxylon aphyllum and Haloxylon persicum. The aim of this study was to investigate the changes of superoxide dismutase in applied drought stress in two species of Haloxylon. The results showed that the effect of drought stress on increase in superoxide dismutase activity was significant (p≤0.01) in two haloxylon species. Drought increased enzyme activity at severe tensions. When two haloxylon species were placed under 7 and 14 days no-watering treatments (mild tensions), the enzyme activity was more than its activity in control treatment and less than one in 21 and 28 days no-watering treatments (severe tensions). The enzyme activity in branchlets of Haloxylon aphyllum under 21 and 28 days no-watering treatments was 20.2 and 29.5% more than its activity under control treatment respectively. This activity in Haloxylon persicum was 21.6 and 31.4% more than its activity under control treatment, respectively. With the advent of drought, superoxide dismutase activity increased in two species of haloxylon. The increasing of superoxide dismutase activity in time of dryness advent in Haloxylon aphyllum was more than Haloxylon persicum, which can be raised as an acceptable factor and vindicator in being more resistant of Haloxylon aphyllum to environmental drought.
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