Spermidine at a
concentration of 100 ppm+4% sucrose, 500 ppm Spm+4% sucrose, 100 ppm Put+4% sucrose, 100 ppm
Spd+4% sucrose and 500 ppm Spd+4% sucrose significantly improved vase life over both control
and4%sucrose. PAs delayed senescence and improved vase life of cut spikes by improving membrane
stability (Mahgoub et al., 2011). The aim of this work was to study the responses Narcissus to the
interactive effects of salicylic acid and Putrescine.