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The effect of continuous lead contamination on lead accumulation, growth of oyster mushroom Pleurotus tuber-regium and its implication for bioremediation is studied. P. tuberregium sclerotium was grown in soil continuously contaminated with lead at 50, 55 and 60ppm respectively. Dried soil and mushrooms were acid digested and analyzed for lead using flame atomic absorption spectrophotometer. The results showed that lead in soil increased as the contamination level was increased. The highest lead accumulation in soil and mushroom were 500±0.41 ppm and 85±0.03 ppm respectively. Fruit body emergence was faster in contaminated soil except at 60ppm. Contaminated soil recorded higher mushroom fresh weight (9.2±1.79 15.9±1.55 g) and %ash (10.83±0.03 18.85±0.04 %) than the control (6.6±0.49 g and 8.48±0.02 %). Bioaccumulation factor was 0.12 to 0.48 indicating that P tuber-regium cannot be employed in bioremediation of a continuously lead contaminated soil.

Lead accumulation in oyster mushroom, Pleurotus tuber-regium (Sing) from a continuously lead contaminated soil