For second experimental series, in vitro shoot tip explants
of 0.3-0.5 mm were cultured in ½ MS medium supplemented with various concentrations and combinations of α-naphthalene acetic acid (0.5-2.0 mg/L NAA), TDZ(1.0-4.0 mg/L) and BAP (0.5-4.0 mg/L) (Sigma, USA).