Abstract
Photoperiodic induction and development of flower buds and fruits depend on the age at which short-day (SD) tratment is started. The minimum number of SD, which is required, decreases from 6 to 4 with increasing age up to 10 days. The time from the start of SD treatment to appearance of the first flower buds is constant in all conditions tested except if induction is performed by only 4 SD; in this case, the appearance time is delayed by 6 days. The number of flower buds increased with the number of SD cycles up to 15, and with the age up to 10 days. Likewise, the efficiency of the photoperiodic induction on flower and fruit development increased with the number of SD cycles and with the age of the plant.
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