Abstract:

The dynamic changes in size and weight of fruits, and the contents of total acid, carbohydrates including starch and soluble sugar, soluble solids, ascorbic acid and soluble proteins in Hongyang kiwi fruits during the growth period of 30－135 days after pollination were determined. Results showed that the growth curve of vertical and horizontal diameters for fruits exhibited a fast-slow-fast-slow growth pattern, which was S-shaped curve during the growth period of 30 － 135 days after pollination; the growth curve of fruit weight exhibited a triple S-shaped curve; the content of total acid reached up to the maximal value of 19.34 mmol/100 g on the 100th day, then exhibited a linear decline; the content of starch reached up to the highest level on the 105th day after pollination, then started to drop; the contents of soluble sugar and soluble solids exhibited an increase trend till the maturation of fruits, and a rapid increase trend at the late stage of fruit maturation was observed; the content of total soluble solids was up to 8.7% on 135th day; the contents of ascorbic acid and soluble proteins exhibited a gradual increase trend during fruit maturation, which climbed up to the maximal value of 181.17 mg/100 g and 132.04μg/g, respectively, on the 120th day, then exhibited a decrease till the maturation of fruits. Based on these analyses, the best quality of fruits can be achieved at the 120th day after pollination.

Key words: Hongyang kiwi fruit, ruit, development