This was significantly greater than the second place combination (4.03+/-1.19 GGBs from 5.37 มิวM NAA +4.44 มิวM 2ip combination or 2.47+/-0.77 GGBs from 5.37 มิวM NAA +2.22 มิวM BA combination). There was also a significant difference in the browning rate between the distal and proximal explant sections (Table 3), which firmly excludes the possible application of distal sections as culture explants in future studies.