In order to research the flooded stress response of plants when it in the condition of being flooded in water.Syringa oblata,S.amurensis and S.microphylla as test materials.potted conditions in the flooded stress on the investigating of plant physiological and biochemical characteristics influence,the processing time about 12 day.The results showed that flooded stress make three clove of SOD and POD activity all have certain rise,the MDA content and relative conductivity significant rise,and significantly r...