Abstract Polyamines and SICS (Manganese+ Boron) are popular chemical compounds using for the improvement of qualitative traits of pear and apple fruits. In the present study, we investigated the effects of these compounds on self- and open-pollinated shoots of pear trees. Treatments included putrescine (Put) (0.1 and 0.25mM), Spermine (Spm) and Spermidine (Spd) (0.05 and 0.25mM), and SICS (1 and 2mg/L) solely or along with coverage cotton bags (CCB) in order to prevent cross and open pollination. Based on the results, treatment of Put (0.1mM) alone showed the highest oxidative material index (P< 0.05). Treatments containing Spd (0.25mM) both solely and with cotton coverage, Spm (0.05 and 0.25mM) both solely and with cotton coverage, SICS (1mg/L) alone, and SICS (2mg/L) both alone and with cotton coverage showed the lowest content of oxidative material index in comparison with control (P< 0.05). Spd (0.05mM) alone increased the anthocyanin content (P< 0.05). Treatment of SICS (2mg/L) alone had higher content of (TSS/TA or Index of Maturity) (P< 0.05). SICS at 2mg/L with cotton coverage, Spd at 0.05mM alone, and Spd and Spm (0.05 and 0.25mM) with cotton coverage showed the highest rate of pH (P< 0.05).

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