Changes of defensive enzymes and active oxygen of Puccinellia tenuiflora seedlings under Na2CO3 stress STUDY ON THE CORRELATION OF RESISTANCE AND SUSCEPTIBILITY TO BACTERIAL BLIGHT WITH THE ACTIVE OXYGEN AND THE DEFENSIVE ENZYMES IN HYBRID RICE SEEDINGS VARIATIONS AND SELECTION OF WHEAT MUTANT RESISTANT TO SCAB Activities of POD, PPO and PAL in Poplar(Populus simonii×P. pyramidalis ‘Opera 8277’)Leaves Exposed to Different Volatiles Effect of Postharvest High-oxygen Treatments on ‘Dongzao’Jujube Membrane Lipids Peroxidation and Defensive Enzyme Activities during Shelf-life Effect of Postharvest High-oxygen Treatments on ‘Dongzao’Jujube Membrane Lipids Peroxidation and Defensive Enzyme Activities during Shelf-life Physiological Response of Apple Leaves From Different Cultivars to Exogenous Salicylic Acid Effects of alcoholic extracts from Acorus tatarinowii on defensive enzymes of tomato Effects of Calcium on Resistance to Gray Mold and Aactivities of Defensive Eenzymes Induced by Salicylic Acid in Tomato Leaves