Berthelsen, M. G.

Tustin, D. S.

Waagepetersen, Rasmus Plenge

English

The effect of gibberellin application on the process of appendage formationand flower bud formation was studied in buds from light-flowering ‘PacificRose’ apple trees. GA3 was applied at 300 mg 1−1 on four dates from fullbloom to eight weeks later, and buds were dissected on 11 dates from 40 to140 d after full bloom. In a second experiment, GA3 was applied at 100, 200and 300 mg 1−1 and GA4+7 at 100 and 200 mg 1−1, all at two weeks afterfull bloom. Buds from this experiment were dissected 100 d after full bloomand again 140 d after FB. Appendage formation for vegetative buds could bedescribed by a negative asymptotic curve that reached a maximum value of16.4 appendages. Flower bud initiation peaked in the period 90-100 d afterfull bloom and was completed within a 20 d period, reaching a maximum of18.2 appendages. In both trials appendage formation was affected by budsize, which, in return, was strongly affected by GA treatments. The effectwas most noticeable in the second experiment, where the majority of budswere both small and immature looking 100 d after full bloom. The rate ofappendage formation in these buds was reduced, corresponding to a delay ofup to 20 d. Concomitantly, flower bud initiation was delayed and prolonged.The status of the buds was affected by all GA treatments applied at twoweeks after full bloom, but the effect was more pronounced in the smallbuds. Flower bud formation was generally over-estimated in bud samplescompared with flower counts in the spring, and this posed a problem whenevaluating the effect of gibberellin on appendage formation.1

Effects of $GA_3$ and $GA_{4+7}$ on early bud development of apple

https://vbn.aau.dk/ws/files/46648/abstractfil.pdf

Effects of $GA_3$ and $GA_{4+7}$ on early bud development of apple

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Effects of GA3GA_3GA3​ and GA4+7GA_{4+7}GA4+7​ on early bud development of apple

Abstract

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Effects of $GA_3$ and $GA_{4+7}$ on early bud development of apple