The Effect of Applied Growth Substances on Development of the Strawberry Fruit.: II. Interactions of Auxins and Gibberellins

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Abstract
Growth-rates of receptacles developing after pollination were compared with those of a similar set developing parthenocarpically after treatment with 2-naphthoxyacetic acid (2-NoA). The latter grew slightly more rapidly during the first 10 days, and entered the final ripening phase at the same time as the pollinated receptacles, but in the intervening period the growth-rate of parthenocarpic receptacles was much reduced.Applications of 2-NoA and gibberellic acid separately and in combination were compared at anthesis, and the effects of supplementary treatments 10 days later were investigated. Either chemical was capable of stimulating initial parthenocarpic development and maturation of the ripe fruit, but neither one alone maintained rapid growth throughout the second phase of fruit development. Combinations of 2-NoA and gibberellic acid at high levels, and 2-NoA and a mixture of gibberellins A4 and A7 at lower levels, applied either together at anthesis, or sequentially during development effectively maintained growth rates throughout the whole developmental period.Rates of fruit maturation varied according to the chemical stimulus inducing parthenocarpy. Treatment with gibberellins resulted in early maturity and relatively small fruits. Treatment with 2-NoA led to a longer period of fruit development and relatively larger fruits at maturity in spite of a low rate of growth throughout the second growth phase.
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