Effect of heavy metals (Cd and Ni) on yield and agronomictraits of commonpurslane(Portulacaoleracea)

Subject Areas : Agroecology Journal

Mehrab Yadegari ¹ ( Assistance professor Islamic Azad University Shahrekord Branch Shahrekord, Iran )
Sahar Karimi ² ( Master graduated student Islamic Azad University Shahrekord Branch Shahrekord, Iran )

Received: 2013-04-23 Accepted : 2013-10-10 Published : 2014-05-22

Keywords: Heavy metal, Ni, Cd, Portulacaoleracea, Soil Toxicity,

Abstract :

In order to soil remediation from pollution by heavy metals, a new technical has been recently proposed called phytoremediation. Purslane is also highly tolerant against lack of water and salinity and can be regarded as a hyper accumulator of heavy metals. To study the effect of the nickel and cadmium on growth, yield and other characters of Portulacaoleracea L. a pot experiment was carried out in a completely randomized factorial design with three replications in the field of Azad University of Shahrekord, Iran, in the spring and summer of 2012. Treatments of this experiment included different levels of nickel (0, 20, 60, 120 mg/kg) and different levels of cadmium (0, 5, 20, 40 mg/kg). The results of this research showed that different levels of nickel and cadmium have a significant effect on the morphological and physiological characters of Portulacaoleracea L. and along with increasing the concentration of the heavy metals, these characters significantly decreased in comparison with the control plants. In classifying the averages of height, shoot and root dry matter and percentage of the extract, the highest amount belonged to the control plants and the lowest amount to the plants under combined treatment of nickel (120 mg/kg) and cadmium (40 mg/kg) and the single treatment of cadmium (40 mg/kg). Furthermore, the toxic properties of cadmium are more than nickel  decreased most of measured characters.

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