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Soil pollution with heavy metals such as lead, copper, zinc and cadmium is an increasingly phenomenon caused by human activities such as industrialized wastes materials and agricultural inputs applications (urban solid waste, sewage sludge, pesticide and fertilizer). The existence of these heavy metals in atmosphere, soil and water can cause risk to all of the components of the ecosystem even at low concentrations (1,2). The presence of heavy metals in the soil as one of the major environmental stresses may cause retardation of plant growth and produce reactive oxygen species (3). Lead (Pb) as a heavy metal is one of the greatest important pollutants of land ecosystem. In addition to natural processes, lead can be produced through artificial sources (sooty exhaust from cars, factories, tank batteries, pesticides, etc.) These activities continuously may increase the level of heavy metals in the ecosystem (4). Lead toxicity effects in plants usually appears in concentrations higher than 30 μg g -1 and cause reducing the growth and decreasing the chlorophyll synthesis (5). Lead toxicity causes many difficulties such as inhibition in growth and yield levels, yellowing of young leaves, A-R-T-I-C-L-EI-N-F-O A-B-S-T-R-A-C-T Article Notes: Received: May 13, 2017 Received in revised form: Oct 6, 2017 Accepted: Dec 8, 2017 Available Online: Jan 1, 2018 Background & Aims of the Study: The objective of this study was to investigate the seed pretreatment with salicylic acid (SA) on tolerance and remediation ability of Brassica oleracea var. acephala under lead and zinc stresses. Materials and Methods: Present study was conducted to evaluate phyto-accumulative ability of Brassica oleracea var. acephala in heavy metal concentrations. After seed disinfection, the seeds were soaked in the solution of SA (0, 200 and 300 mgL) for 6 hours and cultured in media with different concentrations ZnSO4 and Pb(NO3) (0, 50, 100 and 200 mgL ). Some germination indices such as the shoot to root ratio, leaf width, fresh and dry weight, chlorophyll content and absorption of heavy metal by seedling were investigated, after 14 days. Results: The results showed that with increasing metal density, almost all of germination indices decreased significantly in comparison with the control. The most heavy metals accumulation was observed in seed pre-treatment with 300 mg L SA and 100 mg L metals treatment. By increasing the concentration of lead and zinc in the medium, the accumulation of metals was increased significantly in the plants. So, in the treatment of 100 mg L of each metal, the accumulation of lead and zinc were 8500.5 and 1085.1 mg kg in dry weight respectively. Conclusions: The results show that that ornamental Kale can be used as a hyperaccumulator plant for lead and zinc in polluted regions in this study. The Ornamental kale would be a high biomass crop that can accumulate the contaminant of lead and zinc in the soil.

Heavy Metals Effects on Brassica Oleracea and Elements Accumulation by Salicylic Acid