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Effect of Na_2CO_3 Stress on Defensive Enzyme System of Puccinellia tenuiflora Seedlings

SUN Guo rong 1, GUAN Yang 1, YAN Xiu feng 2 (1.Department of Biology,Harbin Normal University,Harbin 150080,China; 2.Open Research Laboratory of Forest Plant Ecology,Northeast Forestry University,Harbin 150040,China)[HJ14]  
Under stress of Na 2CO 3,catalase (CAT) activities of Puccinellia tenuiflora seedlings increase as the stress time goes on,that has significant positive relationship with the stress intensity.Superoxide dismutase (SOD) activities of P.tenuiflora seedlings increase as the stress time increase and along with the stress intensity strengthen to a certain intensity (3.0% Na 2CO 3) which decreased.Changes of peroxidase (POD) activities of P.tenuiflora seedlings is same as that of SOD activity,However the change range of which is lower than SOD.MDA contents of P.tenuiflora seedlings increased along with the increase of stress time and the stress intensity strengthen.
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