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Effects of copper on induction of thiol-compounds and antioxidant enzymes by the fruiting body of Oudemansiella radicata

Jiang, Juan, Qin, Chuixin, Shu, Xueqin, Chen, Rong, Song, Haihai, Li, Qiao, Xu, Heng
Ecotoxicology and environmental safety 2015 v.111 pp. 60-65
agricultural soils, antioxidants, catalase, copper, enzyme activity, fruiting, fruiting bodies, glutathione-disulfide reductase, heavy metals, metal tolerance, mushrooms, oxidative stress, peroxidase, superoxide dismutase, thiols
Oudemansiella radicata has been found to have ability to tolerate and accumulate heavy metals. In this study, to know about the metal tolerance and detoxification strategy of O. radicata, the tolerance responses in both cap and stipe of the fruiting body, including the copper content, the changes of thiol compounds production and antioxidant enzymes activities, caused by various copper stress (150–600mgkg−1) during 2–6 days were investigated. Results showed that Cu content in the fruiting bodies increased with the increasing Cu concentrations and growing time, which was higher in cap than that in stipe. For thiols contents, the maximum level was in the sample at 300mgkg−1 Cu after 2d both in cap and stipe, in accordance with superoxide dismutase (SOD) and glutathione reductase (GR) activities. Guaicol peroxidase (POD) activities reached maximum at 150mgkg−1 Cu after 4d and 6d, respectively in cap and stipe, while the maximum of catalase (CAT) activities was recorded at 300 and 600mgkg−1 Cu after 4d in the cap and stipe, respectively. As a whole, low concentration of Cu stimulated the production of thiols and activated the antioxidant enzymes activities in the fruiting body of O. radicata after 2/4d, while high-level Cu decreased the thiols production and enzymes activities after 4/6d. Furthermore, the cap was more sensitive than the stipe to Cu exposure. Different indicators showed different responses to copper accumulation and the different fruiting part (cap and stipe) of O. radicata had ability to response the oxidative stress caused by Cu. Considering the metal accumulation and its own detoxification with short growing time, mushroom might have the potential to be used as bio-accumulator to deal with Cu exposure in the Cu-contaminated farmland soil.