In the continuous indole-3-butyric acid (IBA) and naphthaleneacetic acid (NAA) treatment, shoots were cultivated on MS medium supplemented with either IBA (0.00, 4.92, 9.84, 14.76 and 19.69 lM) or NAA (1.34, 2.69 and 5.37 lM) and 20.0 lM AgNO3. A culture medium devoid of PGR was considered as the control treatment