Shoots with length 3-5 mm and with 1-2 leaves grown on MS medium containing
1mg/L thidiazuron (Phyto Technology Laboratories, United States) was treated with different concentrations of 0; 1; 2; and 3mg/L 1-Naph- thylacetic acid ( NAA, MERCK-Schuchardt). Each treatment repeated three times with four culture bottles for each replication.