Showing 3 results for Asrar
Msc Elham Asadi Karam, Dr Zahra Asrar, Dr Batool Keramat,
Volume 2, Issue 6 (vol.2, no. 6 2014)
Abstract
Accumulation of phenolic compounds is considered as an important tool for environmental stress protection of plants. In this investigation, garden cress seedlings were in control conditions and were irrigated with Hoagland nutrient solution and were treated with methyl jasmonate (MeJ) at 0 (Control),5 ,10 and 20 µM and different concentrations of copper 0 (Control), 50 ,100 and 200 µM. Then shoot fresh weight, phenolic compounds content, anthocyanin content and PAL activity in response to treatments were measured. According to the results, shoot dry weight and PAL activity in treatment (5 μM) MeJ with (50 and 100 μM) copper, were significantly increased compared to control condition. Concentrations of MeJ (5 and 10μM) treated with 50 μM copper significantly increased the chlorophyll a, b, total chlorophyll and phenolic compound contents control conditions were compared. The results indicated that MeJ may act as a signaling molecule to enhance antioxidant pool and protected plants against injuries caused by Cu toxicity. Based on the results, determined that medium concentrations of MeJ (5 and 10 µM) had good effects on improvement of physiological effects in plants under cu toxicity.
Mahmood Reza Azarakhsh, Zahra Asrar, Hakimeh Mansouri,
Volume 2, Issue 6 (vol.2, no. 6 2014)
Abstract
In this research, the effects of cysteine on alleviation of heavy metal stress in purple basil plants were studied and some parameters such as fresh weight of shoot and root, chlorophyll a and b content, carotenoids, anthocyanin, and total phenolic compounds and reducing sugar was measured. Research was conducted in two separate trials for the two group pre-treated cysteine and cysteine -cobalt combined treatments. The treatments containing of 0, 500 and 2500 mM cysteine and 0, 100 and 500 mM cobalt was used. Higher concentrations of cobalt decreased photosynthetic pigments, leaf, root and shoot length, fresh weight of roots and shoots while cobalt stress increased, caused reducing sugars, anthocyanins and total phenolics content. Cysteine reduced the fresh weight of roots, reduction sugar, anthocyanins, and total phenolics of plants compared to plant treated with cobalt treatments without cysteine. Thus, this amino acid improved leaf area, root and shoot length, shoot fresh weight and photosynthetic pigments in stress conditions. Generally, the results showed that pre-treatment of cysteine could alleviate low concentrations of cobalt stress effects than higher amounts application of this heavy metal, while combined treatments containing cysteine was more effective at higher concentrations of cobalt.
Elham Asadi Karam, Batool Keramat, Zahra Asrar, Hossein Mozafari,
Volume 5, Issue 17 (Vol. 5, No. 17, year 2016 2016)
Abstract
Triacontanol (TRIA), a plant growth regulator that is effective in reducing the effects of abiotic stresses. In order to investigation the effects of interaction between arsenic and TRIA treatment on some physiological indicators of coriander the present study carried out based on a factorial experiment in a completely randomized design with three replications. Factors of experiment include in different concentrations TRIA (0, 5, 10 and 20 &muM) and different levels of oxidative stress induced by arsenic (150 and 300 &muM). Arsenic treatment caused a significant accumulation of hydrogenperoxide(H2O2), a significant increasing in lipid peroxidation, increasing of proline, soluble sugars and enhancing the activity of antioxidant enzymes, GPX, APX and reduction the content of chlorophyll a, b and total chlorophyll in leaf plant. Simultaneous Treatment of TRIA and arsenic, decreased the amount of hydrogen peroxide and lipid peroxidation , and also reduced the amount of proline and soluble sugars in the plant, while it resulted in increasing the amount of chlorophyll a, b , total chlorophyll and the activity of antioxidant enzymes in the plant and these results showed the significant role of TRIA coriander plant in protection against heavy metal arsenic, which is through the activation of antioxidant enzymes.
