Effect of exogenous auxins, gibberellins, and cytokinins on fruit development in Chinese gooseberry (Actinidia chinensisPlanch.)

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Abstract
Correlations between seed number and fruit weight, and between seed distribution and fruit shape were established for Chinese gooseberry (Actinidia chinensis Planch.) fruit. Ovaries containing few seeds develop into small fruit, and various growth regulators, either alone or in combination, were applied to fruitlets containing few seeds in an attempt to increase fruit size. In general, auxins (2,4-dichlorophenoxyacetic acid, 2,4,5-trichlorophenoxyacetic acid, β-naphthoxyacetie acid, indoleacetylaspartate), gibberellins (GA3, GA4–7), and cytokinins (6-benzylaminopurine, zeatin) when applied alone did not stimulate fruit development; nor did combinations of auxin + gibberellin, and gibberellin + cytokinin. However, auxin (2,4-D or 2,4,5-T) + 6-benzylaminopurine and auxin + cytokinin + gibberellin markedly stimulated fruit growth especially when treated fruit contained over 200 seeds. These results are discussed in terms of current theories on hormonal control of fruit growth.