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Abstract
Plants of two mashbean genotypes were exposed to 20 or 40 mg L−1 of lead (Pb) or chromium (Cr) along with controls in a completely randomized design (CRD). Application of both metals (lead and chromium) caused a significant reduction in all growth parameters as compared with control. In addition, severe inhibition in potassium (K+) and calcium (Ca2+) uptake was observed with the increasing concentration of both metals in the root medium. Chromium was more toxic in reducing both cations as compared to same dose of lead. Overall, Pb and Cr contents of the root, stem and leaves increased under both metal stresses. In addition, both metals mainly accumulated in the aerial plant parts (stem and leaves).