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The effect of lead and zinc concentrations on the growth of four species of bryophytes.
Abstract
Studies have been made on the morphological and physiological changes that occurred in four bryophyte taxa, namely, Riccia crystalina, Timmiella barbuloides, Hyophila involuta and Physcomitrium repandum in response to the various concentrations of two heavy metals, i.e. zinc and lead. Effect of different concentrations of lead nitrate and zinc sulphate on various parameters was studied at regular intervals on different plants since the amount, duration, intensity of precipitation and plant species affect accumulation of heavy metal. The plants showed reduced number of regenerants and retarded growth when exposed to >0.5 ppm concentration of metals. At higher concentration and exposure for longer duration, the plants lost the chlorophyll content. Effect of Lead nitrate on various parameters was found to be more drastic than Zinc sulphate in most of the cases except in T. barbuloides. The uptake efficiency of the most common heavy metals in mosses follows mostly the order: Pb > Co, Cr > Cu, Cd, Mo, Ni, V > Zn > As.
© 2007 International Formulae Group. All rights reserved.
International Journal of Biological & Chemical Sciences Vol. 1 (2) 2007: pp. 128-135
