Faezeh Fazeli; Sajedeh Shabani fard jahromi
Abstract
Wetlands are the most sensitive ecosystems on Earth. Mighan wetland is the last ecological ring of Arak plain. Discharge of sewage into this wetland result in region ecological changes. Because of the extend role of this wetland in ecological and environmental protection of it’s around life, need ...
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Wetlands are the most sensitive ecosystems on Earth. Mighan wetland is the last ecological ring of Arak plain. Discharge of sewage into this wetland result in region ecological changes. Because of the extend role of this wetland in ecological and environmental protection of it’s around life, need to pay attention. This study aimed to evaluate the concentration of heavy metals )Al, Fe, Ni, Cu, Cr, Zn( in 8 stations of Mighan in summer, autumn and winter by atomic absorption spectrometry in 2012. Results showed that the highest concentration of Al, Fe, Ni, Cu, Cr, Zn were in the location of collision channels, the exit of solute factory 1, middle island1and 2, road side, middle island 2, Road side, respectively. The maximum amounts of Fe, Ni, Cu, Cr, Zn was observed in summer and the maximum amount of Al was observed in autumn. There were some correlations between Zn and COD, Fe with Cr and COD, Cr with Ni and COD, Cu with Ni and COD, Ni with COD in summer, Fe with COD and BOD, Cr with Cu and Ni, Cu with Ni and COD, Ni with COD in autumn and Fe with COD and BOD, Cr with Ni, Cu with pH, COD with BOD in winter. Overall, it seems the wetland stations had higher concentration of heavy metals compared to the wastewater stations in summer, especially. This result obtained in comparison to department of the environment’s national standard.
Faezeh Fazeli
Abstract
Water stress tolerance is seen in almost all plant species or cultivars but its extent varies from species to species or cultivars to cultivars. Sesame (Sesamum indicum L.) is an important oilseed crop. The aim of the present investigation was to study the oxidative effects and antioxidant responses ...
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Water stress tolerance is seen in almost all plant species or cultivars but its extent varies from species to species or cultivars to cultivars. Sesame (Sesamum indicum L.) is an important oilseed crop. The aim of the present investigation was to study the oxidative effects and antioxidant responses in two sesame cultivars (cvs Darab 14 and Yekta) subjected to different levels of poltethylene glycol (PEG 6000). PEG treatments included osmotic potential equal to 0, -0.3, -0.6 and -0.9 MPa and resulted in decrease of seeds germination, seedlings length, fresh and dry masses, relative water content, protein content but increase in contents of hydrogen peroxide, malondialdehyde, proline with increasing of osmotic potential. The activities of antioxidant enzymes such as superoxide dismutase, peroxidase, catalase and ascorbate peroxidase of sesame seedlings changed with the increase of water deficit. According to present study seedlings of cv. Yekta is more tolerant to water deficit than cv. Darab 14.
