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Effect of lead stress on lead accumulation ability and antioxidant enzyme activities of the mushroom Agaricus bisporus*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2020 02
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Effect of lead stress on lead accumulation ability and antioxidant enzyme activities of the mushroom Agaricus bisporus*
HU Yonghua12 ZHOU Yuan2 YAN Chongling2 LIU Junmin2 ZHANG Weiyou2 & WANG Qin2**
1 School of Biological Science and Biotechnology, Minnan Normal University, Zhangzhou, Fujian 363000, China;
2 Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361102, China
lead stress Agaricus bisporus accumulation antioxidant enzymes

Lead ( Pb) is one of the most common heavy metal pollutants in the environment. It not only directly poisons soil organisms and destroys the ecological structure, but also can migrate and transform through the food chain and harm human health. Therefore, the treatment of Pb pollution is extremely urgent. Due to its strong metal enrichment ability and high relative annual biomass, macrofungi have certain advantages in the remediation of heavy metal pollution. In the present study, the mycelium of Agaricus bisporus was exposed to di fferent concentrations of Pb to evaluate its growth, morphology and the activity of antioxidant enzymes. The results showed that in the experimental concentrations of Pb, the mycelium growth had no significant effect, and the accumulation of Pb was found to increase in a concentration-dependent manner reached to 10.40 μg/g. The results of scanning electron microscopy and transmission electron microscope showed that the cell structure of mycelium was damaged and the membrane permeability was increased under Pb treatment. The black particles in the cells were found to be lead by X-ray energy dispersive microanalysis (EDX) which indicated that Pb was accumulated in the cell. Malondialdehyde contents increased with increasing Pb concentration. The activities of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase ( APX) have different degrees of response with the increaseing of Pb concentration. When the enzyme activity reached its maximum, it increased by 56.45%, 61.36%, 13.08% and 10.59%, respectively, compared with the control. This study signifies that A. bisporus can adjust its own antixodant enzyme stystem to adapt to Pb stress, suggesting that A. bisporus has application potential for the remediation of Pb.




Last Update: 2019-07-30