Changes in Contents of Polyamines in the Flag Leaf and Their Relationship with Drought-resistance of Rice Cultivars under Water Deficiency Stress EFFECTS OF POLYAMINES ON BIOCHEMICAL AND PHYSIOLOGICAL CHANGES AND VASE LIFE OF CUT ROSE (ROSA CHINENSIS JACQ. CV. BELLAMIE) FLOWERS DURING SENESCENCE Effects of Exogenous Spermine on Protect Enzyme Activities in Wheat Seedling under Water Stress Effects of Polyamines and Kinetin on In Vitro Frond Senescence in Lemna aequinoctialis 6746 Effects of exogenous spermine on activities of antioxidant enzymes and photosynthesis in cucumber seedlings under NO-3 stress The Relationship Between Polyamines and Senescence of Detached Wheat Leaves Studies of Polyamine Metabolism and β-N-oxalyl-L-α,β-diaminopropionic Acid Accumulation in Grass Pea (Lathyrus sativus) Under Water Stress Effects of Spermidine and Spermine on Phytohormones Content and Polyamine Metabolism of Zoysiagrass under Low Temperature Condition