Department of Botany, Panjab University, Chandigarh-160014
In vitro development of axillary buds of stem explants of Bougainvillea cv. Marypalmer was studied under 12 hr and 24 hr photoperiods during two seasons. The results show that in March, under 12 hr photoperiods the thorn-inflorescence axis developed into sterile flowers but under 24 hr photoperiods and in November under 12 hr photoperiods the thorn-inflorescence axis remained suppressed. The vegetative axillary bud instead sprouted and exhibited good subsequent growth in the medium supplemented with IBA, and Kinetin. On the other hand in November under 24 hr photoperiods sprouting was very poor and the explants died after some time.
