Effects of Cold Stress on Activities of Antioxidant Enzymes and Membrane Lipid Peroxidation of Trigonella foenum-graecum L. Seedlings

[Objective] The purpose was to seek for the effect of cold stress on activities of antioxidant enzymes and membrane lipid peroxidation of Trigonella foenum-graecum L.seedlings.[Method] The activities of SOD,CAT,POD and the content of MDA of Trigonella foenum-graecum L.seedlings were studied under 0 ℃ cold stress.[Result] The results showed that,as the treatment time increasing,the activities of SOD and POD showed the increasing-decreasing-increasing tendency:got the small peak at 6h,then decreased till 12 h,and then increased and got the largest activities at 48 h.The activities of CAT showed the increasing-decreasing tendency,and got the peak at 12 h.Compared with roots,the activities of SOD,POD,CAT in the leaves were higher,and the changing trends were more sharply.The contents of MDA showed the increasing-decreasing tendency,and got the peak at 24 h.The contents of MDA in the leaves were lower than those in the roots.[Conclusion] Three antioxidant enzymes work together to resist the cold injury;the response reactions to cold stress in the leaves were more sharply than those in the roots.