Plant Growth Regulation

, Volume 24, Issue 1, pp 1–5 | Cite as

Ga4/7 promotes stem growth and flowering in a genetic line of Aquilegia x hybrida Sims

  • T.J. Gianfagna
  • R.H. Merritt


‘Rose-White’ is a unique genetic line of Aquilegia x hybrida Sims that will flower without a cold period, does not have an extended juvenile growth phase, and is responsive to gibberellin treatment. Plants treated at the 7-leaf stage with GA4/7 bolted and flowered 20 days earlier than untreated plants. Gibberellin treatment did not increase the growth rate (leaves/day), but induced flowering after the production of fewer leaves. Plant height and the number of flowers per plant increased significantly. GA4/7 treatment delayed flower senescence and abscission. Flower longevity was extended 3-fold when compared to untreated plants. Treatment response was more pronounced at lower temperatures (19°C day/12°C night) than at higher growing temperatures (24°C day/19°C night). GA3 was much less effective than GA4/7 in promoting flowering, and there was no response to benzyladenine.

flowering gibberellin herbaceous perennials 


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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • T.J. Gianfagna
    • 1
  • R.H. Merritt
    • 1
  1. 1.Plant Science DepartmentRutgers UniversityNew BrunswickUSA

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