Abstract
In order to study the effect of lead and different salicylic acid on the growth, photosynthetic pigment of two canola cultivars (Opera and Okapi cultivars), experiment were conducted with seven levels of Pb(NO3)2 and three levels of salicylic acid (0, 5 and 10 μM) . The experiments were conducted in randomized complete block design arrangement in split factorial with three replications.Canola seedlings were grown for 12 days in hydroponic culture in presence of Pb(NO3)2 (0, 0.25, 0.5, 0.75, 1, 1.5 and 2 mM). The results indicated that the increase of lead concentration caused a significant reduction in root and stem length, shoot and root dry weights and leaf area. Also photosynthetic pigments significantly decreased.The extent of toxicity increased with the increasing concentration of lead. Seedlings treated with both lead and salicylic acid showed an increase in most of the parameters compared to plants without salicylic acid treatment.
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