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Effects of waterlogging on LDH and protective enzyme in Camptotheca acuminata seedling

CAI Jin-feng,CAO Fu-liang,WANG Gui-bin(College of Forest Resources and Environment,Nanjing Forestry University,Nanjing,Jiangsu 210037,China)  
The changes of root activity,lactate dehydrogenase(LDH),protective enzyme activity and reactive oxygen species of Camptotheca acuminata seedling under different flooding stresses were investigated in this experiment.The results showed that in the late stage of waterlogged stress,root activity decreased dramatically,LDH decreased under different degree and time of stress;peroxidase(POD) and superoxide dismustase(SOD) changed more significantly.In mild flooding stress,SOD and POD activity could remain stable at a relatively high level,the activity increased first and then declined with the stress time extension in severe flooding stress.In the later stage the capability to clear reactive oxygens tended to be less effective,thereby leading to the leaf lipid peroxidation degree higher,accumulating more malondialdehyde(MDA) in the leaves,causing injury to the seedlings.
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