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Pakistan Journal of Biological Sciences
Year: 2001  |  Volume: 4  |  Issue: 5  |  Page No.: 575 - 580

Effect of Zinc and Cobalt on Germination and Seedling Growth of Pennisetum americanum (L.) Schumann and Parkinsonia aculeata L.

Nazia Burhan, S. Shahid Shaukat and Asmat Tahira    

Abstract: The effects of heavy metals cobalt and zinc on germination, seedling growth, and dry biomass accumulation of two species viz., Pennisetum americanum and Parkinsonia aculeata were investigated. Cobalt and zinc were used as nitrate and chloride. Final germination was reduced greatly at higher concentrations. Germination reduction was markedly higher in Pennisetum compared to Parkinsonia. Reduction in root growth was relatively greater than the shoot growth. Parkinsonia exhibited some degree of tolerance against heavy metals in terms of germination, root and shoot growth and dry biomass accumulation. The mechanisms of tolerance and co-tolerance to heavy metals are discussed.

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