Abstract
Mustard (Brassica juncea) var. Pusa Jaikisan was grown in a pot experiment in soil supplemented with different concentrations of nickel and chromium (50 and 100 mg kg−1 soil), lead (100 and 200 mg kg−1 soil), cadmium (5 and 10 mg kg−1 soil) and mercury (25 and 50 mg kg−1 soil) as a leafy vegetable. The study revealed that as the contamination level increased significant reductions were observed in biomass, photosynthetic rate and chlorophyll a and b contents as compared to control plants. However, plant’s stress tolerance mechanisms, including proline content and activity of antioxidant enzyme increased under different treatments. Mercury treatment recorded greater negative effects on the crop.
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