Abstract
Under strictly non-inductive photoperiods (24-h photoperiods) floral buds were initiated on plants receiving 25 treatments with Reso (resorcinol) or 8 treatments with GA3 (gibberellic acid) or GA3 + Reso, while water treated control plants did not flower at all. Although a single treatment of plants with GA3 or GA3 + Reso is not adequate to cause induction under LD conditions, its effect is added to the sub-threshold induction caused by one SD (short day: 8-h photoperiod) cycle. The initiation of floral buds was hastened with an increasing number of SD cycles accompanying respective number of treatments, the effect of GA3 alone or together with Reso being more pronounced than that of Reso alone. GA3 increased the number of floral buds more than Reso, the number being the highest in plants receiving the respective number of treatments with the combination GA3 + Reso under both inductive as well as non-inductive photoperiods.
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