Mac. Demeulemeester et al., INDUCTION OF STEM ELONGATION ON IN-VITRO CHICORY ROOT EXPLANTS UNDER UNFAVORABLE PHOTOPERIODIC CONDITIONS BY GIBBERELLIN A(3), Plant growth regulation, 16(3), 1995, pp. 239-241
Flowering stems are formed under long-day conditions on root explants
of chicory (Cichorium intybus L.) cultured in vitro while under short
days, only vegetative growth is observed. Under short-day conditions (
12 h), stem elongation is induced by treating newly formed shoot apice
s with GA(3) (1 mu 1, 10(-3) M). No flower buds were formed on the GA(
3)-induced stems. Long days seem to be indispensable for the induction
of flower buds on the elongated stem.