Table 4 shows the effect of different IBA concentrations on root production
in cultures incubated under a 16 h photoperiod. There was root
production at all IBA concentrations used, similar to the observation recorded
in cultures incubated under constant light. However, the mean
root length and frequency of root production recorded in cultures
grown under a 16 h photoperiod (Table 4) were lower when compared
at the equimolar level to what was observed in cultures placed under
constant light (Table 3). Furthermore, the number of offshoots produced
in cultures under a 16 h photoperiod (ranging from 2.8 to 3.6
shoots as shown in Table 4) was lower than what was observed under
constant light (ranging from 3.0 to 4.8 shoots as shown in Table 3).