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Effect of gibberellins A3, A4+7 and A13 and of (−)-kaurene on flowering and extension growth of Impatiens balsamina under different photoperiods

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Summary

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.

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Authors and Affiliations

  1. Department of Botany, Panjab University, Chandigarh, India

    K. K. Nanda, H. N. Krishnamoorthy, K. L. Toky & K. Lata

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  1. K. K. Nanda
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  2. H. N. Krishnamoorthy
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  3. K. L. Toky
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  4. K. Lata
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Nanda, K.K., Krishnamoorthy, H.N., Toky, K.L. et al. Effect of gibberellins A3, A4+7 and A13 and of (−)-kaurene on flowering and extension growth of Impatiens balsamina under different photoperiods. Planta 86, 134–141 (1969). https://doi.org/10.1007/BF00379821

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  • DOI: https://doi.org/10.1007/BF00379821

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