Abstract
The interactive effects of gibberellic acid, abscisic acid, and benzyladenine were studied in relation to runner formation of the everbearing strawberry. In two of three cultivars studied, Ozark Beauty and Superfection, exogenous gibberellic acid stimulated runner formation and inhibited flowering. In the Geneva cultivar, a shy runner producer, gibberellic acid application as a foliar spray failed to induce runners. When applied in combination with benzyladenine, gibberellic acid greatly stimulated runner formation Benzyladenine alone had no effect on runnering. Exogenous abscisic acid inhibited petiole length and runner formation and had no influence on the number of inflorescences initiated. Response to exogenous gibberellic acid or abscisic acid varied according to the reproductive or vegetative stage the plant exhibited at the time of treatment. Activity of endogenous gibberellin-like substances was not substantially different between flowering and non-flowering field-grown Geneva plants when sampled in long day lengths of August. Endogenous inhibitors were highly active in flowering Geneva plants and relatively inactive in non-flowering plants The implications of these findings on hormonal balance in the strawberry are discussed.
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