The effect of preharvest spray of putrescine and salicylic acid solutions on some qualitative properties of  Granny Smith apple fruit

In the current research, salicylic acid and putrescine treatments solutions each with 0, 0.5, 1, and 2 mM/L levels were sprayed on the ‘Granny Smith’ apple trees in three preharvest stages. The treatments were applied based on factorial experiment in the randomized complete block design. Weight loss, fruit firmness, total soluble solids (TSS), titratable acidity (TA), pH, TSS/TA, peel color, and ascorbic acid parameters were measured in five stages after the harvest. The results revealed that the treatments led to reduce weight loss, to maintaine fruit firmness and to conserve TA parameters significantly (p