The Effects of Self-incompatibility Control Substances On Yield and Fruit Growth Traits of Pear Pyrus communis L. Cultivar ‘Williams’; [Einsatz von verschiedenen Substanzen zur Vermeidung der Selbstinkompatibilität und ihr Einfluss auf Ertrag und Fruchtwachstum bei der Birnensorte (Pyrus communis L.) ‚Williams‘]

Self-incompatibility, low yield and fruit set represent important factors influencing the pear production in Iran. Some compounds such as polyamines and the mixture of some mineral elements like SICS could be suitable to decrease above concerns. The trail included putrescine (Put) (0.1, 0.25 mM), both spermine (Spm) and spermidine (Spd) (0.05, 0.25 mM) and SICS (1, 2 mg/L) in (self and open) pollination and control. Spd (0.25 mM) in open pollination mode showed the highest yield per branch and fruit set in comparison with control. Spermidine (0.25 mM) in self-pollination mode was the best treatment for fruit length and diameter. In self-pollination mode, Spd (0.05 mM), Spm (0.25 mM) and SICS at 2 mg.L showed the significantly increase in irregular fruit shape. Spd and Put (0.25 mM) in self-pollination showed the best fruit volume among all of the treatments at both of pollination mode. © 2021, Springer-Verlag GmbH Deutschland, ein Teil von Springer Nature.