The Growth of Apple Fruitlets, and the Effect of Early Thinning on Fruit Development: With fourteen Figures in the Text

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Abstract
The development of fruitlets of the apple varieties Cox's Orange Pippin and Miller's Seedling was investigated with particular reference to rate and duration of cortical cell division and expansion. The fruitlet weight increases slowly for the first few days after pollination, then exponentially at a rapid rate for about 3 weeks, and then at a declining rate until harvest. The rate of cell division is very rapid during the exponential phase of fruitlet growth, and then the rate declines, but division continues until about 12 weeks after full bloom in Miller's Seedling and for at least 6 or 7 weeks after pollination in Cox's Orange Pippin. The cells expand exponentially until about 7 weeks after pollination, then continue to expand at a diminishing rate until harvest. Heavy pre-blossom thinning increased fruit size and weight, affecting the rate of both cell division and cell expansion; the differences in fruit weight showed by the 4th week and in cortical cell number and cell diameter by the 5th week after full bloom.

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