In vitro induction of roots in Saintpaulia ionantha was studied by using
various concentrations of four different types of auxins viz., NAA, IBA, IAA and 2,4-D
with a control (simple MS medium). All three concentrations of the four hormones were
capable to induce roots in the regenerated plantlets alongwith the induction of some
callus. Surprisingly, the control medium (without hormone), was found sufficient for the
induction of roots as the number of roots induced by the control was much higher than
the media which didn’t induce calli (Table 3). Similar response was observed for
Kalanchoe tomentosa In vitro root induction (Khan et al., 2006). These results might be
due to the fact that the in vitro grown plantlets of Saintpaulia ionantha produced
sufficient amount of auxins endogenously and no exogenous auxins was required for the
induction of roots.