Physiological studies of the developing fruit of Chinese gooseberry (Actinidia chinensis Planch.), 1: Morphological observations of the developing fruit.
1990
Jao J. | Chino K. | Matsui H. | Ohara H. | Hirata N.
The morphology of fruit growth of Chinese gooseberry (cv. "Hayward", "Abbott", "Bruno", "Monty" and "Greensill") from full bloom to maturity was studied. The growth curve of fruit in five cultivars obtained from the data concerning the increase in fresh weight of fruit was double sigmoid, and three distinct growth stages (I, II and III) were identified. Stage I, a period of rapid increase in fruit weight, was for about 60 days, Stage II, a period of delayed increase in fruit weight, was for about 30 days and also Stage III, a period of rapid increase again in fruit weight, was for about 75 days. However, the growth curve of fruit, as measured by increase in fruit diameter, was not double sigmoid. The last cell division in outer pericarp, inner pericarp and central core of each cultivar occurred 24 to 30 days, 18 to 30 days and 15 to 18 days after full bloom, respectively, and cell division ceased earlier in the inner tissue than outer tissue. The number of cell layers in each tissue at the time of termination of cell division was 49 to 62 in outer pericarp, 29 to 39 in inner pericarp and 27-53 in central core. The enlargement of cells in outer pericarp of "Hayward" fruit occurred very rapidly after the time of the last cell division and continued until the end of Stage I. After Stage II, it was slow until the fruit reached maturity.
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