Tolerance of lead by the fruiting body of Oudemansiella radicata

Abstract

This study focused on the tolerance responses of the fruiting body of Oudemansiella radicata towards different concentrations of lead (250-1000mgkg-1) for 2-6d. To know about the lead tolerance and detoxification strategy, the lead content, thiol content and the activities of antioxidant enzymes were investigated. The maximum level for the lead concentration in O. radicata was recorded in the 6d sample in each treatment, and for thiols, it was recorded in the 500mgkg-1 Pb/2d sample, while for superoxide dismutases (SOD) and catalases (CAT) activities, it was reached at 1000mgkg-1 Pb after 2d in the stipe and cap, respectively. Peroxidases (POD) activities showed a more complex trend and glutathione reductases (GR) reached the maximum at 500mgkg-1 Pb after 2d in the stipe. Overall, the results showed that low concentration lead stimulated the fruiting body of O. radicata to produce the thiols and activate the antioxidant enzymes after 2d/4d, while high concentration Pb resulted in the decline/decrease of the thiols and the activities of antioxidant enzymes after 4d/6d. Benefiting from the metal accumulation, detoxification potential and the short lifetime, mushroom have the potential for bioaccumulation of heavy metal in polluted farmland. © 2012 Elsevier Ltd.