This research aimed to explore the effect of zeatin (6-γ,γ-dimethylallyl-amino) concentration on in vitro shoot proliferation six olive (Olea europaea L.) cultivars, ‘Aggizi Shami,’ ‘Coratina,’ ‘Frantoio,’ ‘Manzanillo,’ ‘Picual,’ and ‘Toffahi.’ The cultivars were reproduced via multiplication Rugini medium (OM) with three concentrations (2, 4, 6 mg L-1) for subcultures. Shami’ ‘Toffahi’ had hig...