This study investigated the effects of polyamines, which were applied exogenously in growth period of sunflo- wer (Helianthus annuus L. cv. Santafe) plants grown, under controlled conditions, on leaf pairs and total leaf surface area. Salt was used in 3 different concentrations (50, 100 and 200 mM NaCl) and also, spermine, spermidine and putrescine was applied in 3 levels (0.01, 1 and 2 mM). The leaf and stems of sunflower plants grown in salt culture solutions in Hoagland and at various concentrations for 45 days were sprayed with polyamine solution every other 3 days and 8 times in total as from the 15th day.
The total leaf areas and areas of leaf pairs decreased depending on increasing salt concentration. Sper- mine, spermidine and putrescine sprayed to plants were able to show positive effect only under specific and limited conditions. Putrescine was determined to be the most effective polyamine in removing the inhibitory effect of salt on leaf area.