, Volume 165, Issue 2, pp 292–294 | Cite as

Promotion of flowering in apple trees with gibberellin A4 and C-3 epi-gibberellin A4

  • Norman E. Looney
  • Richard P. Pharis
  • Masana Noma
Short Communication


The proportion of spurs flowering on apple trees (Malus domestica Borkh. cv Golden Delicious) displaying a high degree of alternate-year flowering was increased in the “off” year by gibberellin A4 (GA4) and C-3 epi-GA4 applied in the previous year. When applied 4.5 weeks after anthesis amounts of GA4 ranging from 3 to 300 μg per spur and 25 or 50 μg of C-3 epi-GA4 per spur were effective. Treatments with GA4 made seven weeks after anthesis were less effective. A combination of 30 μg GA4 and 30 μg zeatin (6-(4-hydroxy-3-methylbut-trans-2-enylamino)purine) promoted flowering at both treatment times, and tended to be more effective than GA4 alone.

Key words

Cytokinin and flowering Flower initiation Gibberellin (GA4, epi-GA4 and flowering) Malus (flowering) 



gibberellin or gibberellin-like substance


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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • Norman E. Looney
    • 1
  • Richard P. Pharis
    • 2
  • Masana Noma
    • 1
  1. 1.Pomology and Viticulture SectionAgriculture Canada Research StationSummerlandCanada
  2. 2.Plant Physiology Research Group, Biology DepartmentUniversity of CalgaryAltaCanada

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