EFFECT OF EXOGENOUS SPERMIDINE ON POLYAMINE CONTENT AND ANTIOXIDANT ENZYME ACTIVITIES IN ROOTS OF CUCUMBER SEEDLINGS UNDER ROOT-ZONE HYPOXIA STRESS

• 外源亚精胺对根际低氧胁迫下黄瓜幼苗根系多胺含量和抗氧化酶活性的影响