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Articles by Samaneh Rahmatzadeh
Total Records ( 3 ) for Samaneh Rahmatzadeh
  Samaneh Rahmatzadeh and Jalil Khara
  Among the harmful components of sunlight is ultraviolet radiation of wavelengths 220-380 nm. UV-C (220-280 nm) is one of the three UV spectra that is filtering out in the atmosphere, but it can cause oxidative and morphological changes in the some conditions. Vesicular arbuscular mycorrhiza can resist many plants against stress conditions. Wheat (Triticum aestivum L. cv. Azar2) plants colonized by three species of mycorrhizae namely Glomus etunicatum, Glomus intraradices and Glomus veruciforme were used in this study. They have been exposed to UV-C (245 nm) light for 7 h. We measured dry and fresh weight of shoot and root systems and length of the longest roots and leaves. Also, we measured percentage of root length colonization. Furthermore, number of mesophyll cells in each treatment is determined by staining the leaf cross sections. Mycorrhizal treated plants showed increased root length colonization in comparition to non-mycorrhizal treatment. However, no significant difference was observed in the leaves length all of the treatments. Also, fresh and dry weight was increased in UV treated mycorrhizal plants in comparition to non-inoculated ones. Infection percentages and number of mesophyll cells had not significant difference between mycorrhizal and non-mycorrhizal plants.
  Parviz Malekzadeh , Jalil Khara , Shadi Farshian , A`zam Khalighi Jamal-Abad and Samaneh Rahmatzadeh
  In acid soils worldwide cadmium toxicity is a major factor limiting plant growth. The harmful effect of cadmium is initially expressed as a reduction in growth followed by several other secondary responses. In this study, some of the toxic effects of Cd+2 like induction of oxidative stress were investigated. The effect of metal ion on the root growth was considered in maize plants. Maize (Zea mays L.) seeds were sterilized with 2.5% sodium hypochlorite solution for 15 min and washed thoroughly with distilled water. These seeds then germinated in petri dish (20 cm) containing distilled water at 37°C in the dark. After a 1 day incubation, uniformly germinated seeds were selected and transferred to Petri dishes (9.0 cm) containing filter paper moistened with 10 mL of distilled water. Each Petri dish contained 12 germinated seeds. Each treatment was replicated 4 times. The germinated seeds were allowed to grow at 27°C in darkness and 5 mL of test solution was added to each Petri dish in the second day. The test solution contained 0, 0.25, 0.5, 0.75, 1, 3 and 5 mM CdCl2. Cadmium treatments, increased GPX and APX activities in root in the presence of 0.25, 0.5, 0.75 mM concentrations, but their activities were constant in 1, 3 and 5 mM. Increased concentrations of CdCl2 from 0.25 to 5 mM decreased root length progressively. However, no reduction of shoot length by CdCl2 was observed.
  Samaneh Rahmatzadeh and Jalil Khara
  UV-C radiation (220-280 nm) is known to causing damage in some physiological growth parameters such as chlorophyll, carotenoid, protein and sugar contents. In this study, effect of some species of vesicular arbuscular mycorrhizal fungi on tolerance of UV-C radiation in wheat plants was studied. Wheat (Triticum aestivum L. cv.Azar2) plants colonized by three species of mycorrhizae namely Glomus etunicatum, Glomus intraradices and Glomus veruciforme were used in this study. They have been exposed to UV-C (254 nm) light for 7 h (28 days, 15 min each day). We measured total proteins, sugars, chlorophyll a and b and carotenoids. Our study showed that UV-C radiation decreases chlorophylls, carotenoids and sugars contents. But this effect on total proteins content has not been significant. However, mycorrhizal fungi could increase all of these factors in comparison to non-mycorrhizal samples. Therefore, these fungi species can increase above growth factors of wheat plants, apparently.
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