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Journal of Agricultural Science and Technology، جلد ۲۷، شماره ۵، صفحات ۰-۰
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عنوان انگلیسی Physiological and Biochemical Responses of Maize (Zea mays) to Phenanthrene Toxicity
چکیده انگلیسی مقاله In this study, the effect of different concentrations of phenanthrene (0, 25, 50, 75, and 100 ppm) on growth parameters, photosynthetic pigments, some antioxidant enzymes, and some biochemical compounds of the maize plant were investigated. The experiments were conducted as pot cultures of plants under controlled conditions using a Completely Randomized Design (CRD) with three replications. Increasing phenanthrene concentration reduced all studied growth parameters and significantly increased photosynthetic pigment contents. Phenanthrene led to the increase in catalase, peroxidase, and superoxide dismutase activities in the roots, but in shoots, only the peroxidase activity was increased. Moreover, higher phenanthrene concentrations were associated with elevated levels of malondialdehyde and hydrogen peroxide, coupled with a marked reduction in soluble sugar content in both shoot and root tissues (P< 0.05). Also, increase in phenanthrene concentration in the shoots decreased the total phenol and flavonoid contents compared to anthocyanin. Phenanthrene treatment led to a significant reduction in the concentrations of lauric, meric, palmitic, and oleic acid in maize shoots. In conclusion, it seems that high concentrations of phenanthrene induce oxidative stress in the maize, and plants improve their enzymatic antioxidant system to moderate the stress condition. In addition, damage of cell membranes by phenanthrene leads to weakening of plants root system, disordering in water and nutrient uptake and, finally, reduction in the plant growth.
 
کلیدواژه‌های انگلیسی مقاله Antioxidant system, Oxidative stress, Physiological responses, Polycyclic aromatic hydrocarbons
نویسندگان مقاله | Mahdieh Houshani
Department of Biology, Tonekabon Branch, Islamic Azad University, Tonekabon, Islamic Republic of Iran.


| Seyed Yahya Salehi-Lisar
Department of Plant, Cell and Molecular Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Islamic Republic of Iran.


| Ali Movafeghi
Department of Plant, Cell and Molecular Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Islamic Republic of Iran.


| Rouhollah Motafakkerazad Motafakkerazad
Department of Plant, Cell and Molecular Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Islamic Republic of Iran.
نشانی اینترنتی http://jast.modares.ac.ir/browse.php?a_code=A-10-80553-1&slc_lang=en&sid=23
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