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Superoxide Dismutase Activity and Lipid Peroxidation in Relation to Senescence of Muskmelon on Leaves

Ma Binggang\+1\ Shi Jiang\+2\ Xiao Lu\+3(1 Dept of Hort & Fore Eng,Agri Col,Shihezi Univ,Shihezi 832003;2 Shihezi Institute of Vegetables,Shihezi 832000; 3 Dept of Biology Science,Shihezi Univ,Shihezi 832003)  
This paper using respectively whole nutrition liquid,lack Cu Zn nutrition liquid,lack Fe nutrition liquid,lack Mn nutrition liquid and added 10% NaCl nutrition liquid to culture of muskmelon seedling,studies superoxide dismutase(SOD),lipid peroxidation in the leaves of muskmelon during three culture stages.The results indicates that leaf senescence associated with the decreases of SOD activity.A marked increase of malondialdehyde(MDA)content,product of liqid peroxidation were observed during leaf senescence.The analysis of polyacrylamide gel electrophoresis showing the SOD isozymes in leaf extract was Cu Zn SOD.Changes of SOD isozymes were observed during leaf agling.The destroying effect of oxygen free radical on enzymes and membrane in the course of leaf senescence was discussed.\;
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