The Stimulating Effect of Polyamine and Brassinolide on Sweet Cherry cv. ‘0900 Ziraat’ Pollen

Sweet cherry exhibited self-incompatibility and the group incompatibility cultivar '0900 Ziraat' is known to be a self-incompatible cultivar. Fruit set and yield to realize, it is obligatory to the overlap blooming periods between the main and pollinizer cultivars, as well as to consider factors such as self and cross-pollination, environmental terms, and pollen quality. In the study, Pollen germination (PG) and pollen tube length (PTL) were evaluated after following applications (0.05, 0.25, 0.50, 2.50 mM and control) of 24-epibrassanoid (24-epiBL) and Putrescine (PUT). PG and PTL rates were significantly impressed by the application of two bioregulators (24-epiBL and PUT), and the longest PG and PTL formed in the 0.25 mM application of both bioregulators. Whereas higher doses particularly, 0.50 and 2.5 mM presented restrictive effects on both PG and PTL. In comparing two bioregulator applications on PG and PTL, a higher stimulant effect was observed at low doses in PUT, and the higher inhibition effect was monitored in 24-epiBL with 2.5 mM application. In conclusion, on PG and PTL of sweet cherry cultivar '0900 Ziraat' high concentrations (0.50 mM and 2.50 mM) of two bioregulators showed toxic effects contrary, lower concentrations (0.05 mM and 0.25 mM) have been positively efficient.