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ISHS Acta Horticulturae 34: Symposium on growth Regulators in Fruit Production

CHEMICAL CONTROL OF VEGETATIVE GROWTH AND FLOWERING OF APPLE TREES

Author:   M.W. Williams
DOI:   10.17660/ActaHortic.1973.34.21
Abstract:
It is proposed that the growth regulators TIBA, SADH and CEPA have an indirect, rather than a direct, effect on flower initiation in apple trees. Flower induction in young vigorous trees follows a temporary restriction of vegetative growth, and only occurs after the nutritional requirements for root and shoot growth are satisfied. All three chemicals control growth by inhibiting the production, movement and/or utilization of IAA and possibly GA. Flower initiation follows a period of accumulation of endogenous growth regulators such as cytokinins and sterols which control protein synthesis and other vital processes.

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34_20     34     34_22

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