The transformation frequency (%) in dependence on various types of A. membranaceus explants and time of co-cultivation with agrobacterial suspensions of A4-RT (A) and 15834 SWISS (B) strains. 1- hypocotyl, 2 – cotyledon, 3 – primary shoot, 4 – in vitro derived microshoot. Data is given as M ± m. Means followed by the same letters do not differ significantly from each other according to Duncan’s Means Separation test at p ≤ 0.05