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Pak. J. Bot., 42(1): 239-246, 2010. |
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Updated: 08-03-10 | ||||
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PHYSIOLOGICAL RESPONSES OF PHASEOLUS VULGARIS TO DIFFERENT LEAD CONCENTRATIONS
NEELOFER HAMID, NOSHEEN BUKHARI AND FAIZA JAWAID
Abstract: Studies were carried out on the phytotoxicity of lead on some physio-biochemical parameters that is chlorophyll, protein, carbohydrate, nucleic acid and phenolic content of Phaseolus vulgaris. Phaseolus vulgaris seedlings were treated with 25, 50 and 100 ppm concentration of lead acetate and a control (without any treatment) and sown in pots. Increasing lead acetate levels lead to several disruptions of Phaseolus vulgaris plants, which are reflected by reductions of protein, chlorophyll, carbohydrate DNA and RNA content. However phenolic content of plants were increasing with increasing levels of heavy metal lead. The effect of lead toxicity was more pronounced at 100 ppm as compared to 25 and 50 ppm lead concentration.
Department of Botany, University of Karachi, Karachi-75270, Pakistan. |
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