Department of Botany, Panjab University, Chandigarh, India.
Planta. 1969 Jun;86(2):134-41. doi: 10.1007/BF00379821.
Gibberellins A3, A4+7 and A13 and (-)-kaurene delay floral-bud initiation and flowering and decrease the number of floral-buds and flowers in Impatiens balsamina under 4-hr photoperiods. They do not have any marked effect under 8-hr photoperiods. Under 16- and 24-hr photoperiods they hasten floral-bud initiation and flowering and increase the number of flowers, the effect being greater under 16- than under 24-hr days and the order of effectiveness being GA4+7>GA3>GA13>(-)-kaurene.While GA3 and GA4+7 promote extension growth, the effect being greater with the former, GA13 and (-)-kaurene do not promote it under any photoperiod. The magnitude of stem elongation in different treatments prior to floral-bud initiation increases from 4- to 8-hr photoperiods but decreases under 16- and 24-hr periods, the effect being more under 24-hr although both 16-and 24-hr photoperiods are noninductive for flowering.
赤霉素 A3、A4+7 和 A13 以及 (-)-贝壳杉烯在 4 小时光周期下延迟凤仙花的花芽起始和开花，并减少花芽和花的数量。它们在 8 小时光周期下没有明显的影响。在 16 小时和 24 小时光周期下，它们加速花芽起始和开花，并增加花的数量，16 小时光周期下的效果大于 24 小时光周期下的效果，效果顺序为 GA4+7>GA3>GA13>(-)-贝壳杉烯。虽然 GA3 和 GA4+7 促进延伸生长，前者的效果更大，但 GA13 和 (-)-贝壳杉烯在任何光周期下都不促进生长。在花芽起始前不同处理的茎伸长量从 4 小时光周期增加到 8 小时光周期，但在 16 小时和 24 小时光周期下减少，24 小时光周期的效果更大，尽管 16 小时和 24 小时光周期都不能诱导开花。
