Abstract
AbstractThe critical dark period requirement for flowering of Impatiens balsamina L. cv. Rose, an obligate short day plant, is about 8.5 hours. While GA3 completely substituted for the dark period requirement, Phosfon prolonged it to 9.5 hours.GA3 hastened and Phosfon delayed the initiation of floral buds under all photoperiods.Floral buds opened into flowers only during 8 and 14 hour photoperiods in control and Phosfon‐treated plants but during all photoperiods in GA3‐treated ones.The delay in floral bud initiation and flowering was correlated with shifting up of the node bearing the first floral bud and flower respectively.While GA3 increased the numher of floral buds and flowers in all photoperiods except 8‐hour, Phosfon increased their number in the 14‐hour photoperiod only. The number of flowering plants decreased with increasing photoperiod regardless of GA3 and Phosfon application. The effect of Phosfon was completely or partially overcome, depending upon the photoperiod, by simultaneous application of GA3.
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