Effect of exogenous zinc addition on cell protective enzyme activities in the fruit bodies of Lentinus giganteus

Abstract:

Abstract: [Objective] The effects of exogenous Zn addition on cell protective enzyme activities in the fruit bodies of Lentinus giganteus were studied. [Methods] ZnSO4 was used as exogenous Zn and added into culture medium. The final Zn concentrations in culture media were 0, 10, 20, 30, 40, 50 mg/kg respectively. The activities of superoxide dismutase (SOD), peroxidase (POD), polyphenol oxidase (PPO), malondialchehyche (MDA) content and soluble protein content in the fruit bodies were analyzed by spectrophotometry; catalase (CAT) was determined by potassium permanganate titration. [Results] The content of soluble protein and SOD, POD and CAT activities in the fruit bodies of L. giganteus were significantly increased (P<0.01), but PPO activity (P<0.01) and MDA content (P<0.05) was significantly decreased in the treatment of 30 mg/kg Zn concentration. The content of soluble protein and SOD, POD and CAT activities showed a decreasing trend with the increase of Zn concentration, but MDA content was significantly increased (P<0.01 and P<0.05 ). [Conclusion] High Zn concentration caused the increase of MDA contents and the decrease of SOD, POD and CAT activities in the fruit body of L.giganteus. It will destroy the protective enzyme system, cause the accumulation of free radicals and thus intensify membrane lipid peroxidation. Appropriate Zn concentration improved the protective enzyme activities, and lightened the harm of membrane from lipid peroxidation.