Effects of Molybdenum on Biomass,Activities of Antioxidase and Quality of Glycyrrhiza Uralensis Fisch.

Objective:To investigate the effects of different molybdenum(Mo)concentrations on growth,biomass,the activities of antioxidase and quality of Glycyrrhiza uralensis.Methods:The seedlings of G.uralensis were subjected to four concentrations Mo treatments(0.55,1.1,5.5,11.0 mg·L-1 Mo)by water culture in a greenhouse.The concentration of Mo in control block(CK)is 0 mg·L-1.The biomass,activities of superoxide dismutase (SOD),peroxidase(POD)and catalase(CAT)and the contents of glycyrrhizic acid and liquiritin of seedlings were determined.Results:The results indicate that under 5.5 mg·L-1 Mo treatment,the fresh and dry weight,and the root shoot ratio are the highest,and the activities of SOD,POD and CAT of the root,stem and leaf in G.uralensis are also the highest.It indicates the concentration of Mo was appropriate for growth and accumulation of root,and low concentration of Mo or high Mo were not good for the growth of this plant.However,the accumulation of glycyrrhizic acid of the root was significantly improved by the concentration of 1.1 mg·L-1 Mo.In addition,the content of glycyrrhizic acid under CK reached lowest.Conclusion:The results demonstrate that proper Mo concentration can significantly enhance biomass and active constituents of the root,and the activities of antioxidase could response the adaptability of G.uralensis seedlings to molybdenum.Therefore,a further experiment will be done to find a suitable concentration of Mo that could no only increase the root biomass but also increase contents of glycyrrhizic acid.